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Vol. 2, No. 3, Page 169-182 
Copyright © 2008, TSI® Press 
Printed in the USA. All rights reserved 
Horticultural Therapy has Beneficial Effects 
on Brain Functions in Cerebrovascular 
Diseases 
Yuko Mizuno-Matsumoto *,1, Syoji Kobashi 2, Yutaka Hata 2, Osamu Ishikawa 3, and 
Fusayo Asano 4 
1 University of Hyogo, Graduate School of Applied Informatics, Kobe, JAPAN 
2 University of Hyogo, Graduate School of Engineering, Himeji, JAPAN 
3 Ishikawa Hospital, Himeji, JAPAN 
4 Tokyo University of Agriculture, Department of Bio-therapy, Faculty of Agriculture, Tokyo, 
JAPAN 
Received 15 May 2008; accepted 30 June 2008 
Abstract 
Horticultural therapy (HT) is gaining attention as a form of rehabilitations in medical fields 
especially such as occupational therapy and nursing care, although its effectiveness has not been 
proven yet. This paper uses a strictly medical point of view to assess whether or not HT is effective 
for improvement of functional activities in the brains of brain-damaged patients. Five patients in 
Ishikawa Hospital with cerebrovascular diseases were invited to participate in HT for a month in 
addition to their routine medication and physical therapy (PT). The HT program was designed by 
horticultural therapists. The original purpose of the HT program was to monitor its effects on mental 
healing, cognitive re-organization, and training of sensory-motor function. The Functional 
Independence Measure (FIM) and the Self-Rating Depression Scale (SDS) were performed before 
and after HT to assess the patients’ physical activities of daily living (ADL) and to determine the 
patients’ mental changes in depressive states, respectively. Functional magnetic resonance imaging 
(fMRI) during recognition tasks was also measured before and after HT. The ADL of all patients 
significantly improved after HT; however, the depressive states in all patients did not change 
remarkably after the HT. fMRI examinations showed that the visual area, the inferior temporal area, 
the fusiform gyrus, and the supramarginal gyrus (SMG), in addition to the motor area, the 
supplementary motor area (SMA), the sensory area, and the cerebellum were activated after HT. 
These findings suggest that HT can accelerate an improvement of activities in the “visual and color 
processing areas” and the “association areas” as well as the sensory-motor areas of the brain in the 
patients with cerebrovascular diseases. HT, therefore, stimulates parts of brain, that are not always 
evoked through routine physical rehabilitation. HT can complement the routine physical 
rehabilitation and help to improve damaged brain function. 
* Corresponding author information: 
Yuko Mizuno-Matsumoto, M.D., Ph.D. (Medicine & Engineering) 
Graduate School of Applied Informatics, University of Hyogo 
Kobe Harborland Center Bldg. 22F, 1-3-3 Higashi-Kawasakichou, Chuo-ku, Kobe, Hyogo 650-0044, JAPAN, 
TEL/FAX: +81-78-367-8616/+81-78-362-0651, yuko@ai.u-hyogo.ac.jp
Keywords 
Horticultural therapy (HT), fMRI, Supramarginal gyrus (SMG), Visual area, Cerebrovascular 
disease, Functional independence measure (FIM) 
170 
1. INTRODUCTION 
Horticulture is defined as the art and science of 
growing flowers, fruits, vegetables, and trees 
and shrubs resulting in the development of the 
minds and emotions of individuals and the 
enrichment and health of communities 
civilization [1]. Horticultural therapy (HT) is a 
remedial process in which plants and 
gardening activities are used to improve the 
body, mind, and spirits of people [2]. HT is 
thought to be an effective and beneficial 
treatment for people of all ages, backgrounds, 
and abilities. The therapeutic benefits of 
peaceful garden environments have been 
understood since ancient times. In the 19th 
century, Dr. Benjamin Rush, a signer of the 
Declaration of Independence considered to be 
the “Father of American Psychiatry,” reported 
that garden settings held curative effects for 
people with mental illness [2]. 
Soderback reviewed the literature on HT and 
described its use in rehabilitation following 
brain damage [3]. He showed that HT affected 
emotional, cognitive and/or sensory motor 
functional improvement and increased social 
participation, health, well-being and 
satisfaction with life. Jones and Haight 
reviewed articles on the use of the natural 
environment in the form of plants or plant 
material as therapeutic interventions [4]. They 
showed that there was a beneficial relationship 
between humans and the natural environment 
in the current therapeutic uses. 
Although HT has been strongly advocated, its 
effect is less established. Most papers on HT 
have been reported from the view of 
occupational therapy and nursing care. 
Therefore, the effectiveness of these 
interventionist approaches from the medical 
point of view remains to be proved, and it 
would have been desirable to perform 
subjective assessment of the approaches. 
Ulrich [5] reported the positive influence of 
nature on patients in the hospital. Surgical 
patients assigned to rooms with windows 
looking out on a natural scene had shorter 
postoperative hospital stays, received fewer 
negative evaluative comments in nurses’ notes, 
and took fewer potent analgesics than patients 
in similar rooms with windows facing a brick 
wall. 
Ulrich et al. showed that influences of nature 
could reduce the emotional, attentional, and 
physiological aspects of stress using the 
Zuckerman Inventory of Personal Reactions 
(ZIPERS), which is questionnaire using affects 
(subjective aspects of feeling or emotion) to 
assess feelings [6]. Ulrich et al. also measured 
physiological reactions using an 
electrocardiogram (ECG), pulse transit time, 
spontaneous skin conductance response, and 
frontalis muscle tension using an 
electromyogram (EMG), and documented 
physiological changes related to recovering 
from stress, including low blood pressure, 
reduced muscle tension, and differences in 
cardiac responses. 
Soderback indicated that HT could categorize 
four different intervention approaches: 
“virtual”, “viewing”, “interaction”, and 
“action” [3]. In the routine occupational or 
physical therapies, a patient executes “actions” 
only according to the therapist’s instruction. 
On the other hand, in HT the patient can 
objectively imagine the growth of vegetation in 
his or her own way, actually see that the 
vegetation is growing and simultaneously 
perform his/her own activities as 
rehabilitations. Ulrich suggested that the 
benefits of nature such as trees and other 
vegetations were positive influences on 
emotional and physiological states of the 
people, and the benefits came from visual 
encounters with nature from urban planning 
point of view [7].
171 
We have investigated the effectiveness of HT 
on the hypotheses that (1) imagination, 
observation, and participation in growing 
vegetation makes a positive effect on a 
patient’s actual activities, and (2) viewing 
colorful vegetation in nature under sunlight 
improves the visual abilities in the brain. To 
prove these hypotheses, we designed 
experimental fMRI protocols that reveal 
visual, recognitional, motor, and emotional 
functions/abilities. In addition, we used the 
questionnaires to measure the activities of 
daily living (ADL) and the mental mood of the 
patients. 
The aim of this paper is to assess whether 
horticulture therapy is effective for 
improvement of brain functional activity in 
brain-damaged patients from the medical point 
of view. 
2. METHODS 
Case #1 was a 75-year-old right-handed male 
patient who had suffered a right internal 
carotid artery occlusion and had left 
hemiplegia and dysarthria. Case #2 was a 
42-year-old right-handed male patient who had 
suffered a left cerebral infarction and had right 
hemiplegia and aphasia. Case #3 was a 
60-year-old right-handed female patient who 
had suffered a right anterior cerebral artery 
occlusion and had left hemiplegia. Case #4 was 
a 56-year-old right-handed male patient who 
had suffered right thalamic bleeding and had 
left hemiplegia. Case #5 was a 68-year-old 
right-handed female patient who had suffered 
bleeding in the right frontal lobe and had left 
hemiplegia and dysarthria. Written informed 
consent was obtained from all subjects and 
patients after a detailed briefing of the 
experimental purposes and protocol. 
The functional independence measure (FIM) is 
an evaluation tool used to quantify the ability 
of patients to enter rehabilitation treatment and 
to chart their progress until discharged into the 
community or to another facility [8]. The FIM 
is an assessment instrument rating a patient’s 
level of function in 18 physical and mental 
tasks that represent the basic ADL. The total 
score rage is from 18 as a perfect dependent to 
126 as a perfect independent. There are 13 
motor items ranging from 13 to 91 (eating, 
grooming, bathing, dressing the upper body, 
dressing the lower body, toileting, bladder and 
bowel management, transfers to bed/chair, 
toilet and tub/shower, walking/wheelchair, and 
stair climbing) and 5 cognitive items ranging 
from 5 to 35 (comprehension, expression, 
social interaction, problem-solving, and 
memory). Each patient’s FIM was scored at the 
beginning and ending of the HT to assess levels 
of ADL. 
All patients were evaluated as to whether or not 
they suffered from depression, based on the 
DSM IV-TR (Diagnostic and Statistical 
Manual of Mental Disorders Fourth Edition 
TR) criteria. A medical doctor also evaluated 
mental status using indicators such as mood, 
motivation, communication, and expression 
with an observational study. Moreover, the 
Self-Rating Depression Scale (SDS) was used 
to evaluate not only “depression” but also the 
“patients’ depressive states” influenced by 
their mental mood. All patients were rated 
using the SDS in scoring only 20 items of the 
questionnaire. The relationship between mean 
SDS score of patients and diagnosis of major 
depression was reported [9]. This report 
showed that the SDS had a sensitivity of 80 
percent and specificity of 88 percent for 
detecting patients with major depression. The 
SDS was performed before and after the HT to 
assess changes in depressive state. The SDS 
score ranged from 20 to 80. A score of more 
than 50 is supposed to show the possibility of a 
severe depressive state (possibility of severe 
major depression is high), and a score of 40-50 
is supposed to show a moderate depressive 
state (possibility of a moderate depression is 
high). 
Five patients were invited to participate in HT 
designed by horticultural therapists for a month 
in addition to the routine medical and physical 
treatment given in Ishikawa Hospital. The 
purpose of HT program was to bring about 
effects in mental healing, cognitive 
re-organization, and training of sensory motor 
function. The HT consisted of three steps: 
imagining nature, designing a flowerbed, and
172 
actually planting a tree. The therapists 
instructed the patients in all these processes. 
Table 1 shows an example of the HT program 
for each session in Case #2. The subject was 
able to experience the whole process of 
growing flowers including designing a garden, 
creating a planting plan, preparing a flowerbed 
for seeding, seeding, watering, and making 
pressed flowers from his/her own flowers from 
the flowerbed. It took about a month to 
complete this process. Figure 7 in the 
Appendix shows some pictures of scenes from 
HT programs in Table 1. 
Table 1. Horticultural Therapy Program for Case #2. 
Session Description of Programs 
1 Flowerbed preparation (weeding) 
2 Flowerbed preparation (weeding) 
3 Readying the soil 
4 Creating a planting plan for flowerbeds 
5 Briefing on future activities and selecting seedling 
6 Cultivating 
7 Terrarium making 
8 Planting to the flowerbed according to plan 
9 Planting seedling to flowerbed 
10 Soil readying, watering, and dividing seedling 
11 Watering, and picking up withered flowers 
12 Doing crafts using moss, and watering 
13 Watering 
14 Planting vegetables, weeding, dividing 
15 Making name plates for the flowerbeds 
16 Watering and weeding 
17 Watering, weeding, and appreciating other patients’ flowerbeds 
18 Making a container garden 
19 Making pressed flowers 
20 Working in the garden 
Functional magnetic resonance imaging 
(fMRI) under recognition tasks was measured 
before and after HT. The experimental fMRI 
protocols were designed to reveal the 
hypotheses on the effectiveness of HT as we 
mentioned in Introduction. In the other words, 
viewing, recognition, movement, and the 
emotional functions/abilities of the patients 
were trying to be clarified. Subjects performed 
two kinds of tasks, in which they fixated on an 
image and categorized it into a “pleasant” 
image or an “unpleasant” image based on the 
previous instructions for each trial. Images 
included two kinds of emotional photos: a 
girl’s smiling facial expression (pleasant) or an 
angry facial expression (unpleasant) in task 1, 
and a healthy forest landscape (pleasant) or a 
dying forest (unpleasant) in task 2. Each trial 
involved the consecutive presentation of the 
photos for 2 seconds proceeded by a crosshair 
image for 20-30 seconds (Figure 1). Subjects 
were instructed to fixate on a photo, and judge 
whether or not the photo was pleasant by 
moving their right index finger, or unpleasant 
by moving both the right index and middle 
fingers. Each task consisted of 20 blocks, half 
of which were pleasant, and half of which were 
unpleasant. Photos were randomly ordered 
within each task. The duration of each task was 
516 seconds. In the study, five patients 
performed this experimental protocol using the 
fMRI scanner before and after HT.
1 block 
20 blocks (516 sec) 
Figure 1. Schematic diagram of fMRI measurement task. 
173 
MR images were acquired on a 1.5 Tesla 
SIGNA CV/i scanner (GE Medical Systems, 
Milwaukee, WI). After initial acquisition of T1 
structural images, echo planar imaging (EPI) 
was used to acquire data sensitive to the BOLD 
signal at a repetition time (TR) of 2000 ms and 
an echo time (TE) of 40 ms. High-resolution 
T1 images were acquired to aid in anatomic 
normalization. The spatial resolution of BOLD 
images was set by a 64 by 64 voxel matrix 
covering 260 × 260 mm2 with a 5 mm slice 
thickness. The image gave an in-plane 
resolution of 4.06 by 4.06 mm2. Twenty axial 
slices with 5 mm thickness were acquired to 
cover the whole brain. During the data 
acquisition, 258 images (phases) per slice were 
obtained in 516 seconds (= 258 x 2.0 sec). This 
produced a 4-D dataset consisting 64 × 64 × 20 
× 258 voxels, in which a voxel is referred to as 
(x, y, z, t). 
Data analysis was performed with the 
Statistical Parametric Mapping analytic 
package (SPM5, Wellcome Department of 
Cognitive Neurology, London, UK). In the 
first step, we identified regions that showed 
significant activation during the pleasant or 
unpleasant images compared to those during 
the crosshair image. Activations were reported 
if they exceeded p < 0.05 (uncorrected) on the 
single voxel level in each patient. We showed 
images of the activation areas before and after 
HT. In the next step, the differences between 
the images before and after HT were calculated 
using the t-statistic, and contrast maps were 
generated for each patient. We extracted the 
increased areas in activity after HT compared 
to those before HT in each patient (p < 0.1). In 
the figures the areas in which activation 
decreased or did not change after HT were 
omitted. 
3. RESULTS 
The doctors’ clinical observations of the whole 
process left the impression that all the patients’ 
expressions and motivation had improved after 
the HT.
174 
Table 2 shows date information of subjects: 
onset of disorders, beginning of general 
rehabilitation, beginning of HT, first, before 
HT and second, after HT measurement of 
fMRI. HT began 6 months after the onset of 
disorder in Case #1 and 2 years and 8 months 
after the onset in Case #2 although HT began 
2-3 months after the onsets in Cases #3, #4, and 
#5. 
Table 2. Date Information of subjects 
Case #1 Case #2 Case #3 Case #4 Case #5 
Onset of disorder 12/6/2003 10/1/2001 6/28/2004 6/21/2004 1/26/2005 
Beginning of rehabilitation 4/22/2004 4/2/2002 7/27/2004 8/14/2004 3/11/2005 
Beginning of HT 6/8/2004 6/8/2004 9/25/2004 9/25/2004 4/4/2005 
First trial 6/1/2004 6/1/2004 fMRI 9/25/2004 9/25/2004 4/4/2005 Second trial 7/16/2004 7/16/2004 10/25/2004 10/25/2004 5/19/2005 
Table 3 shows the total scores of FIM before 
and after the HT. The scores of motor and 
cognitive items are also shown in the table. The 
total scores of all the cases after HT are 
significantly larger than those before HT 
(paired T test: p < 0.03). The scores on motor 
items of all cases after HT are also significantly 
larger than those before HT (paired T test: p < 
0.03), while there are no significant differences 
between the scores on cognitive items before 
and after HT (paired T test: p = 0.16). 
The medical doctor ruled out all the patients 
except Case #2 as depression based on a 
diagnosis of DSM IV-TR criteria from the 
clinical point of view. Table 4 shows the scores 
of SDS before and after HT. Case #2 before 
and after HT is categorized into a severe 
depressive state, and Case #4 before and after 
HT and Case #5 after HT are categorized into a 
moderate depressive state as assessed by the 
SDS score. However, there are no significant 
differences between the SDS scores of all cases 
before and after HT (paired T test: p = 0.88). 
Table 3. Scores of FIM 
Case #1 Case #2 Case #3 Case #4 Case #5 
Total score 62 91 86 64 59 
Before HT Motor items 38 72 53 39 33 
Cognitive items 24 19 33 25 26 
Total score 92 89 116 114 104 
After HT Motor items 68 71 81 85 75 
Cognitive items 24 18 35 29 29 
* p < 0.03 
Table 4. Scores of SDS 
Case #1 Case #2 Case #3 Case #4 Case #5 
Before HT 39 57 38 47 36 
After HT 37 61 32 45 44 
p = N.S. 
Figures 3 to 6 show the activated areas during 
the cognitive tasks before and after HT (p < 
0.05), and the increased areas in activation 
after HT, compared to the level before HT (p < 
0.1) in Cases #1 through #5, respectively. 
Figure 3 shows that the bilateral visual areas 
(Brodmann areas: BAs 17 and 18), the right 
motor area (BA 4), and the left supplementary 
motor area (SMA) (BA 6), the right sensory 
areas (BAs 3 and 2), the right supramarginal 
* 
*
175 
gyrus (SMG) (BA 40), and the left cerebellum 
were activated after HT to compare to their 
activation level before HT in Case #1. Figure 3 
shows that the bilateral visual areas (BAs 17 
and 18), the left motor area (BA 4), left SMA 
(BA 6), the left sensory areas (BA 2), the 
bilateral temporal pole (BA 38), the right 
fusiform gyrus (BA 37), and the right 
cerebellum were activated in Case #2. Figure 4 
shows that the bilateral visual areas (BAs 17 
and 18) and the left cerebellum were activated 
in Case #3. Figure 5 shows that the left visual 
areas (BAs 17 and 18) and the right prefrontal 
areas (BAs 10, 11, and 47), the sensory area 
(BA 1), the left SMG (BA 40), the bilateral 
middle temporal gyrus (BA 21), the right 
inferior temporal gyrus and fusiform gyrus 
(BA 20), the right temporal pole (BA 38), and 
the bilateral cerebellum were activated in Case 
#4. Figure 6 shows that the bilateral cerebellum 
was activated in Case #5. 
Figure 2. Activated areas of Case #1 before HT (left) and after HT (middle) (p < 0.05), and 
increased areas in activation after HT, compared to the activation level before HT (right) (p < 
0.1). 
Figure 3. Activated areas of Case #2 before HT (left) and after HT (middle) (p < 0.05), and 
increased areas in activation after HT, compared to the activation level before HT (right) (p < 
0.1).
Figure 4. Activated areas of Case #3 before HT (left) and after HT (middle) (p < 0.05), and 
increased areas in activation after HT, compared to the activation level before HT (right) (p < 
0.1). 
Figure 5. Activated areas of Case #4 before HT (left) and after HT (middle) (p < 0.05), and 
increased areas in activation after HT, compared to the activation level before HT (right) (p < 
0.1). 
Figure 6. Activated areas of Case #5 before HT (left) and after HT (middle) (p < 0.05), and 
increased areas in activation after HT, compared to the activation level before HT (right) (p < 
0.1). 
176
177 
Table 5 shows a summary of the activated 
areas after HT in each patient (Cases #1 
through #5). In the table, the letter “A” 
represents an increase of activation after HT, 
compared to the level before HT (p < 0.1). The 
letters “O”, “F”, “P”, “T”, and “C” represent 
occipital, frontal, parietal, temporal, and 
cerebellum, respectively. Each area number 
shows the Brodmann area in occipital, frontal, 
parietal, and temporal lobes. “L” and “R” show 
left and right hemispheres, respectively. The 
column in gray shows a disabled side in each 
patient. 
The visual areas (BAs 17 and 18), the motor 
area (BA 4), SMA (BA 6), the prefrontal areas 
(BAs 10, 11, and 47), the sensory areas (BAs 3, 
1, and 2), SMG (BA 40), the middle temporal 
gyrus (BA 21), the inferior temporal gyrus and 
fusiform gyrus (BAs 20 and 37), the temporal 
pole (BA 38), and the left cerebellum were 
activated after HT to compare to the activation 
level before HT. These events occurred in an 
unaffected side of cerebellum in all patients 
and the occipital area in all but one. 
Table 5. Increased areas in activation after horticultural therapy in each patient 
(Cases #1 through #5). 
The letter “A” represents increased areas in activation after HT, compared to the level before 
HT (p < 0.1). The letters “O”, “F”, “P”, “T”, and “C” represent occipital, frontal, parietal, 
temporal, and cerebellum, respectively. Each area number shows the Brodmann area in 
occipital, frontal, parietal, and temporal lobes. “L” and “R” show left and right hemispheres, 
respectively. The column in gray shows a disabled side in each patient. 
Case #1 #2 #3 #4 #5 
Area # L R L R L R L R L R 
17 A A A A A A A 
O 
18 A A A A A 
4 A A 
6 A A 
10 A 
11 A 
F 
47 A 
3 A 
1 A 
2 A A 
P 
40 A A 
21 A A 
20 A 
38 A A A 
T 
37 A 
C A A A A A A A 
p < 0.1
178 
4. DISCUSSION 
The effects of HT in the brain functions of 
cerebrovascular diseases were investigated 
using fMRI studies and questionnaires. The 
results in this paper show an increase of 
activations in the visual area, the motor area, 
SMG, sensory area, SMA, the prefrontal area, 
the inferior and middle temporal gyrus, the 
fusiform gyrus, the temporal pole, and the 
cerebellum. Recent fMRI studies reported that 
mainly recovered areas after the stroke using 
the routine rehabilitation were the sensory 
area, motor area, premotor area (PMA), 
cerebellum, SMA, and parietal areas[10, 11, 
12]. Our results show that the visual area, the 
inferior temporal gyrus, the fusiform gyrus, 
and the SMG were activated in addition to the 
ordinarily recovering areas. HT could cause 
these differences in the process of recovering 
brain activities. 
The fusiform gyrus and the inferior temporal 
cortex are considered to be related to human 
color processing [13, 14, 15]. These color 
processing areas and visual areas increased 
their activities after HT. This result shows that 
processes of HT: “virtual” elements such as 
creating a planting plan (Figure 7-A), 
“viewing” nature (Figures 7-B to 7-G), 
“interaction”, and “action” through doing 
gardening jobs, under the sunlight, could have 
an effect on the color processing areas and 
visual areas in the brain. Our results show that 
viewing and concerning color processing 
might be essential in the effectiveness of HT. 
SMG is well known to play a roll in perception 
and discernment in the association area [16]. 
SMG might mediate a nonspatial attentional 
function, such as stimulus detection or alerting 
other areas to the appearance of a salient 
stimulus irrespective of a precise spatial 
location [17, 18]. The results presented here 
demonstrate that this kind of network area of 
the brain in addition to the motor, sensory, and 
visual areas increased its activities after HT. 
These findings suggest that the improved 
motor and sensory skills in the patients could 
be associated with reactivation or 
compensation of a physiological network such 
as SMG in the brain. Our results show that HT 
contributes to their activations. 
HT can stimulate parts of brain not always 
evoked through routine physical rehabilitation. 
HT can compensate for routine physical 
rehabilitation and help to improve damaged 
brain function. 
Our results from one questionnaire showed that 
the daily activities in total score and motor 
items of FIM significantly improved. 
Compares with other therapies such as routine 
physical therapy, occupational therapy, music 
therapy, and animal therapy, HT has the 
following features: (1) a patient can objectively 
observe vegetation growing, (2) the patient can 
intervene in the process of growing vegetation 
from seeds, (3) the patient can actually see the 
results of his/her efforts when the vegetation 
has grown, (4) the patient can amicably share 
his/her achievements with other people. 
Spontaneous rehabilitation of the patient could 
be encouraged by repeated successful 
experiences of growing plants. We think that 
these features can help the patient improve 
his/her ADL. 
Our results from the other questionnaire, SDS, 
showed that mood was not changed 
remarkably in most patients. For mental mood 
or emotional improvement, a tailor-made 
program of HT during a long period would be 
needed. 
Another feature of HT is its beginning or onset 
time. Case #1 and Case #2 began 6 months and 
2 years and 8 months, respectively after the 
onset (Table 2). In spite of the long time after 
the onset of disorders, Case #1’s and Case #2’s 
brain function activated after HT. This 
activation shows that HT can effectively 
improve brain function even if HT begins 
several months or years after the onset. The 
time of the onset of disorders therefore, might 
be irrelevant, because HT contains multi-functional 
elements, and the patient can move 
from fundamental activities to complex 
activities. 
We report here changes in brain function of 
five cases after HT. Now we are planning to
179 
target a larger number of patients who will 
participate in HT and we will investigate their 
brain activities through a quantitative 
statistical analysis in the future. We are also 
planning to compare patients given HT with 
patients not given HT. These five case studies 
proved the possibility that HT accelerates an 
improvement of activities in the “visual and 
color processing area” and the “association 
area” of brains in the patients with 
cerebrovascular diseases. Moreover, HT can 
also help to contribute to improvement in the 
patients’ ADL. We think the research 
presented here is necessary to accomplish 
further studies. 
ACKNOWLEDGEMENTS 
This work is partially supported by a 
Grant-in-Aid from the Ministry of Education, 
Culture, Sports, Science and Technology, JP 
(19500393). 
APPENDIX 
A. Creating a planting plan B. Selecting seedlings for flowerbeds 
C. A flowerbed before weeding D. A flowerbed soon after planting
E. A flowerbed a month after planting 
F. Flowerbeds and flowerpots planted by patient 
G. Watering 
Figure 7. Scenes from Horticultural Therapy Programs 
180
181 
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36: T164-T173 
[17] Perry R. J. and Zeki S. (2000) The 
neurology of saccades and convert shifts 
in spatial attention: an event-related 
fMRI study. Brain 123,: 2273-2288 
[18] Geier C. F., Garver K. E., and Luna B. 
(2007) Circuitry underlying temporally 
extended spatial working memory. 
Neuroimage. 35: 904-915 
AUTHOR INFORMATION 
Yuko Mizuno- 
Matsumoto received 
the M.D. degree from 
Shiga University of 
Medical Science, 
Japan, in 1991, and 
Ph.D. degrees in 
Medical Science and 
Engineering from 
Osaka University, 
Japan, in 1996 and 2003, respectively. From 
1999 to 2000, she was a Post-Doctoral
182 
Research Fellow in the Department of 
Neurology, Johns Hopkins University, 
Baltimore, MD. Since 2004, she has been an 
Associate Professor in the Graduate School of 
Applied Informatics, University of Hyogo, 
Kobe, Japan. She is a Certifying Physician of 
The Japanese Society of Psychiatry and 
Neurology, and a Certifying Physician & 
Electroencephalographer of Japanese Society 
of Clinical Neurophysiology. 
Syoji Kobashi is an 
associate professor in 
Graduate School of 
Engineering, University 
of Hyogo, Japan. His 
research interests 
include soft computing 
approach to medical 
signal/image processing 
and human brain functions. He received the 
Joseph F. Engelberger Best Paper Award at the 
2nd World Automation Congress in 2000, the 
IEEE EMBS Japan Young Investigators 
Competition from IEEE EMBS Japan Chapter 
in 2003. 
Yutaka Hata is a 
professor in Graduate 
School of Engi-neering, 
University of 
Hyogo, Japan. He 
spent one year in 
BISC Group, Uni-versity 
of California 
at Berkeley from 
1995 to 1996 as a visiting scholar. He is the 
Founding Editor-in-Chief of the International 
Journal of Intelligent Computing in Medical 
Sciences and Image Processing, and the re-gional 
editor of Intelligent Automation & Soft 
Computing. He received Joseph F. Engelber-ger 
Best Paper Award and Best Paper Award at 
the WAC2000, USA. and WAC Contribution 
Award, at 2002, 2004 and 2006. 
Osamu Ishikawa is a 
Vice-President of 
Ishikawa Hospital, 
Japan. He is also the 
President of A Geriatric 
Health Services 
Facility, SEIYOU. His 
research interests are in 
medical imaging, 
surgery systems, and 
care systems for elderly persons. 
Fusayo Asano, Ph.D. 
in Agriculture, is a 
professor of Labora-tory 
of Plant Assisted 
Therapy, Department 
of Bio- therapy, faculty 
of Agriculture, Tokyo 
University of Agri-culture, 
Japan. She is a 
Horticultural Therapist Master at the American 
Horticultural Therapy Association and re-ceived 
Rhea McCandliss Professional Service 
Award in 2004 for her contribution to the field 
of horticultural therapy, especially in educa-tion. 
She is a founding director of the Japanese 
Society of People-Plant Relationships and 
Japanese Horticultural Therapy Association.

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Horticultural Therapy has Beneficial Effects on Brain Functions in Cerebrovascular Diseases

  • 1. Vol. 2, No. 3, Page 169-182 Copyright © 2008, TSI® Press Printed in the USA. All rights reserved Horticultural Therapy has Beneficial Effects on Brain Functions in Cerebrovascular Diseases Yuko Mizuno-Matsumoto *,1, Syoji Kobashi 2, Yutaka Hata 2, Osamu Ishikawa 3, and Fusayo Asano 4 1 University of Hyogo, Graduate School of Applied Informatics, Kobe, JAPAN 2 University of Hyogo, Graduate School of Engineering, Himeji, JAPAN 3 Ishikawa Hospital, Himeji, JAPAN 4 Tokyo University of Agriculture, Department of Bio-therapy, Faculty of Agriculture, Tokyo, JAPAN Received 15 May 2008; accepted 30 June 2008 Abstract Horticultural therapy (HT) is gaining attention as a form of rehabilitations in medical fields especially such as occupational therapy and nursing care, although its effectiveness has not been proven yet. This paper uses a strictly medical point of view to assess whether or not HT is effective for improvement of functional activities in the brains of brain-damaged patients. Five patients in Ishikawa Hospital with cerebrovascular diseases were invited to participate in HT for a month in addition to their routine medication and physical therapy (PT). The HT program was designed by horticultural therapists. The original purpose of the HT program was to monitor its effects on mental healing, cognitive re-organization, and training of sensory-motor function. The Functional Independence Measure (FIM) and the Self-Rating Depression Scale (SDS) were performed before and after HT to assess the patients’ physical activities of daily living (ADL) and to determine the patients’ mental changes in depressive states, respectively. Functional magnetic resonance imaging (fMRI) during recognition tasks was also measured before and after HT. The ADL of all patients significantly improved after HT; however, the depressive states in all patients did not change remarkably after the HT. fMRI examinations showed that the visual area, the inferior temporal area, the fusiform gyrus, and the supramarginal gyrus (SMG), in addition to the motor area, the supplementary motor area (SMA), the sensory area, and the cerebellum were activated after HT. These findings suggest that HT can accelerate an improvement of activities in the “visual and color processing areas” and the “association areas” as well as the sensory-motor areas of the brain in the patients with cerebrovascular diseases. HT, therefore, stimulates parts of brain, that are not always evoked through routine physical rehabilitation. HT can complement the routine physical rehabilitation and help to improve damaged brain function. * Corresponding author information: Yuko Mizuno-Matsumoto, M.D., Ph.D. (Medicine & Engineering) Graduate School of Applied Informatics, University of Hyogo Kobe Harborland Center Bldg. 22F, 1-3-3 Higashi-Kawasakichou, Chuo-ku, Kobe, Hyogo 650-0044, JAPAN, TEL/FAX: +81-78-367-8616/+81-78-362-0651, yuko@ai.u-hyogo.ac.jp
  • 2. Keywords Horticultural therapy (HT), fMRI, Supramarginal gyrus (SMG), Visual area, Cerebrovascular disease, Functional independence measure (FIM) 170 1. INTRODUCTION Horticulture is defined as the art and science of growing flowers, fruits, vegetables, and trees and shrubs resulting in the development of the minds and emotions of individuals and the enrichment and health of communities civilization [1]. Horticultural therapy (HT) is a remedial process in which plants and gardening activities are used to improve the body, mind, and spirits of people [2]. HT is thought to be an effective and beneficial treatment for people of all ages, backgrounds, and abilities. The therapeutic benefits of peaceful garden environments have been understood since ancient times. In the 19th century, Dr. Benjamin Rush, a signer of the Declaration of Independence considered to be the “Father of American Psychiatry,” reported that garden settings held curative effects for people with mental illness [2]. Soderback reviewed the literature on HT and described its use in rehabilitation following brain damage [3]. He showed that HT affected emotional, cognitive and/or sensory motor functional improvement and increased social participation, health, well-being and satisfaction with life. Jones and Haight reviewed articles on the use of the natural environment in the form of plants or plant material as therapeutic interventions [4]. They showed that there was a beneficial relationship between humans and the natural environment in the current therapeutic uses. Although HT has been strongly advocated, its effect is less established. Most papers on HT have been reported from the view of occupational therapy and nursing care. Therefore, the effectiveness of these interventionist approaches from the medical point of view remains to be proved, and it would have been desirable to perform subjective assessment of the approaches. Ulrich [5] reported the positive influence of nature on patients in the hospital. Surgical patients assigned to rooms with windows looking out on a natural scene had shorter postoperative hospital stays, received fewer negative evaluative comments in nurses’ notes, and took fewer potent analgesics than patients in similar rooms with windows facing a brick wall. Ulrich et al. showed that influences of nature could reduce the emotional, attentional, and physiological aspects of stress using the Zuckerman Inventory of Personal Reactions (ZIPERS), which is questionnaire using affects (subjective aspects of feeling or emotion) to assess feelings [6]. Ulrich et al. also measured physiological reactions using an electrocardiogram (ECG), pulse transit time, spontaneous skin conductance response, and frontalis muscle tension using an electromyogram (EMG), and documented physiological changes related to recovering from stress, including low blood pressure, reduced muscle tension, and differences in cardiac responses. Soderback indicated that HT could categorize four different intervention approaches: “virtual”, “viewing”, “interaction”, and “action” [3]. In the routine occupational or physical therapies, a patient executes “actions” only according to the therapist’s instruction. On the other hand, in HT the patient can objectively imagine the growth of vegetation in his or her own way, actually see that the vegetation is growing and simultaneously perform his/her own activities as rehabilitations. Ulrich suggested that the benefits of nature such as trees and other vegetations were positive influences on emotional and physiological states of the people, and the benefits came from visual encounters with nature from urban planning point of view [7].
  • 3. 171 We have investigated the effectiveness of HT on the hypotheses that (1) imagination, observation, and participation in growing vegetation makes a positive effect on a patient’s actual activities, and (2) viewing colorful vegetation in nature under sunlight improves the visual abilities in the brain. To prove these hypotheses, we designed experimental fMRI protocols that reveal visual, recognitional, motor, and emotional functions/abilities. In addition, we used the questionnaires to measure the activities of daily living (ADL) and the mental mood of the patients. The aim of this paper is to assess whether horticulture therapy is effective for improvement of brain functional activity in brain-damaged patients from the medical point of view. 2. METHODS Case #1 was a 75-year-old right-handed male patient who had suffered a right internal carotid artery occlusion and had left hemiplegia and dysarthria. Case #2 was a 42-year-old right-handed male patient who had suffered a left cerebral infarction and had right hemiplegia and aphasia. Case #3 was a 60-year-old right-handed female patient who had suffered a right anterior cerebral artery occlusion and had left hemiplegia. Case #4 was a 56-year-old right-handed male patient who had suffered right thalamic bleeding and had left hemiplegia. Case #5 was a 68-year-old right-handed female patient who had suffered bleeding in the right frontal lobe and had left hemiplegia and dysarthria. Written informed consent was obtained from all subjects and patients after a detailed briefing of the experimental purposes and protocol. The functional independence measure (FIM) is an evaluation tool used to quantify the ability of patients to enter rehabilitation treatment and to chart their progress until discharged into the community or to another facility [8]. The FIM is an assessment instrument rating a patient’s level of function in 18 physical and mental tasks that represent the basic ADL. The total score rage is from 18 as a perfect dependent to 126 as a perfect independent. There are 13 motor items ranging from 13 to 91 (eating, grooming, bathing, dressing the upper body, dressing the lower body, toileting, bladder and bowel management, transfers to bed/chair, toilet and tub/shower, walking/wheelchair, and stair climbing) and 5 cognitive items ranging from 5 to 35 (comprehension, expression, social interaction, problem-solving, and memory). Each patient’s FIM was scored at the beginning and ending of the HT to assess levels of ADL. All patients were evaluated as to whether or not they suffered from depression, based on the DSM IV-TR (Diagnostic and Statistical Manual of Mental Disorders Fourth Edition TR) criteria. A medical doctor also evaluated mental status using indicators such as mood, motivation, communication, and expression with an observational study. Moreover, the Self-Rating Depression Scale (SDS) was used to evaluate not only “depression” but also the “patients’ depressive states” influenced by their mental mood. All patients were rated using the SDS in scoring only 20 items of the questionnaire. The relationship between mean SDS score of patients and diagnosis of major depression was reported [9]. This report showed that the SDS had a sensitivity of 80 percent and specificity of 88 percent for detecting patients with major depression. The SDS was performed before and after the HT to assess changes in depressive state. The SDS score ranged from 20 to 80. A score of more than 50 is supposed to show the possibility of a severe depressive state (possibility of severe major depression is high), and a score of 40-50 is supposed to show a moderate depressive state (possibility of a moderate depression is high). Five patients were invited to participate in HT designed by horticultural therapists for a month in addition to the routine medical and physical treatment given in Ishikawa Hospital. The purpose of HT program was to bring about effects in mental healing, cognitive re-organization, and training of sensory motor function. The HT consisted of three steps: imagining nature, designing a flowerbed, and
  • 4. 172 actually planting a tree. The therapists instructed the patients in all these processes. Table 1 shows an example of the HT program for each session in Case #2. The subject was able to experience the whole process of growing flowers including designing a garden, creating a planting plan, preparing a flowerbed for seeding, seeding, watering, and making pressed flowers from his/her own flowers from the flowerbed. It took about a month to complete this process. Figure 7 in the Appendix shows some pictures of scenes from HT programs in Table 1. Table 1. Horticultural Therapy Program for Case #2. Session Description of Programs 1 Flowerbed preparation (weeding) 2 Flowerbed preparation (weeding) 3 Readying the soil 4 Creating a planting plan for flowerbeds 5 Briefing on future activities and selecting seedling 6 Cultivating 7 Terrarium making 8 Planting to the flowerbed according to plan 9 Planting seedling to flowerbed 10 Soil readying, watering, and dividing seedling 11 Watering, and picking up withered flowers 12 Doing crafts using moss, and watering 13 Watering 14 Planting vegetables, weeding, dividing 15 Making name plates for the flowerbeds 16 Watering and weeding 17 Watering, weeding, and appreciating other patients’ flowerbeds 18 Making a container garden 19 Making pressed flowers 20 Working in the garden Functional magnetic resonance imaging (fMRI) under recognition tasks was measured before and after HT. The experimental fMRI protocols were designed to reveal the hypotheses on the effectiveness of HT as we mentioned in Introduction. In the other words, viewing, recognition, movement, and the emotional functions/abilities of the patients were trying to be clarified. Subjects performed two kinds of tasks, in which they fixated on an image and categorized it into a “pleasant” image or an “unpleasant” image based on the previous instructions for each trial. Images included two kinds of emotional photos: a girl’s smiling facial expression (pleasant) or an angry facial expression (unpleasant) in task 1, and a healthy forest landscape (pleasant) or a dying forest (unpleasant) in task 2. Each trial involved the consecutive presentation of the photos for 2 seconds proceeded by a crosshair image for 20-30 seconds (Figure 1). Subjects were instructed to fixate on a photo, and judge whether or not the photo was pleasant by moving their right index finger, or unpleasant by moving both the right index and middle fingers. Each task consisted of 20 blocks, half of which were pleasant, and half of which were unpleasant. Photos were randomly ordered within each task. The duration of each task was 516 seconds. In the study, five patients performed this experimental protocol using the fMRI scanner before and after HT.
  • 5. 1 block 20 blocks (516 sec) Figure 1. Schematic diagram of fMRI measurement task. 173 MR images were acquired on a 1.5 Tesla SIGNA CV/i scanner (GE Medical Systems, Milwaukee, WI). After initial acquisition of T1 structural images, echo planar imaging (EPI) was used to acquire data sensitive to the BOLD signal at a repetition time (TR) of 2000 ms and an echo time (TE) of 40 ms. High-resolution T1 images were acquired to aid in anatomic normalization. The spatial resolution of BOLD images was set by a 64 by 64 voxel matrix covering 260 × 260 mm2 with a 5 mm slice thickness. The image gave an in-plane resolution of 4.06 by 4.06 mm2. Twenty axial slices with 5 mm thickness were acquired to cover the whole brain. During the data acquisition, 258 images (phases) per slice were obtained in 516 seconds (= 258 x 2.0 sec). This produced a 4-D dataset consisting 64 × 64 × 20 × 258 voxels, in which a voxel is referred to as (x, y, z, t). Data analysis was performed with the Statistical Parametric Mapping analytic package (SPM5, Wellcome Department of Cognitive Neurology, London, UK). In the first step, we identified regions that showed significant activation during the pleasant or unpleasant images compared to those during the crosshair image. Activations were reported if they exceeded p < 0.05 (uncorrected) on the single voxel level in each patient. We showed images of the activation areas before and after HT. In the next step, the differences between the images before and after HT were calculated using the t-statistic, and contrast maps were generated for each patient. We extracted the increased areas in activity after HT compared to those before HT in each patient (p < 0.1). In the figures the areas in which activation decreased or did not change after HT were omitted. 3. RESULTS The doctors’ clinical observations of the whole process left the impression that all the patients’ expressions and motivation had improved after the HT.
  • 6. 174 Table 2 shows date information of subjects: onset of disorders, beginning of general rehabilitation, beginning of HT, first, before HT and second, after HT measurement of fMRI. HT began 6 months after the onset of disorder in Case #1 and 2 years and 8 months after the onset in Case #2 although HT began 2-3 months after the onsets in Cases #3, #4, and #5. Table 2. Date Information of subjects Case #1 Case #2 Case #3 Case #4 Case #5 Onset of disorder 12/6/2003 10/1/2001 6/28/2004 6/21/2004 1/26/2005 Beginning of rehabilitation 4/22/2004 4/2/2002 7/27/2004 8/14/2004 3/11/2005 Beginning of HT 6/8/2004 6/8/2004 9/25/2004 9/25/2004 4/4/2005 First trial 6/1/2004 6/1/2004 fMRI 9/25/2004 9/25/2004 4/4/2005 Second trial 7/16/2004 7/16/2004 10/25/2004 10/25/2004 5/19/2005 Table 3 shows the total scores of FIM before and after the HT. The scores of motor and cognitive items are also shown in the table. The total scores of all the cases after HT are significantly larger than those before HT (paired T test: p < 0.03). The scores on motor items of all cases after HT are also significantly larger than those before HT (paired T test: p < 0.03), while there are no significant differences between the scores on cognitive items before and after HT (paired T test: p = 0.16). The medical doctor ruled out all the patients except Case #2 as depression based on a diagnosis of DSM IV-TR criteria from the clinical point of view. Table 4 shows the scores of SDS before and after HT. Case #2 before and after HT is categorized into a severe depressive state, and Case #4 before and after HT and Case #5 after HT are categorized into a moderate depressive state as assessed by the SDS score. However, there are no significant differences between the SDS scores of all cases before and after HT (paired T test: p = 0.88). Table 3. Scores of FIM Case #1 Case #2 Case #3 Case #4 Case #5 Total score 62 91 86 64 59 Before HT Motor items 38 72 53 39 33 Cognitive items 24 19 33 25 26 Total score 92 89 116 114 104 After HT Motor items 68 71 81 85 75 Cognitive items 24 18 35 29 29 * p < 0.03 Table 4. Scores of SDS Case #1 Case #2 Case #3 Case #4 Case #5 Before HT 39 57 38 47 36 After HT 37 61 32 45 44 p = N.S. Figures 3 to 6 show the activated areas during the cognitive tasks before and after HT (p < 0.05), and the increased areas in activation after HT, compared to the level before HT (p < 0.1) in Cases #1 through #5, respectively. Figure 3 shows that the bilateral visual areas (Brodmann areas: BAs 17 and 18), the right motor area (BA 4), and the left supplementary motor area (SMA) (BA 6), the right sensory areas (BAs 3 and 2), the right supramarginal * *
  • 7. 175 gyrus (SMG) (BA 40), and the left cerebellum were activated after HT to compare to their activation level before HT in Case #1. Figure 3 shows that the bilateral visual areas (BAs 17 and 18), the left motor area (BA 4), left SMA (BA 6), the left sensory areas (BA 2), the bilateral temporal pole (BA 38), the right fusiform gyrus (BA 37), and the right cerebellum were activated in Case #2. Figure 4 shows that the bilateral visual areas (BAs 17 and 18) and the left cerebellum were activated in Case #3. Figure 5 shows that the left visual areas (BAs 17 and 18) and the right prefrontal areas (BAs 10, 11, and 47), the sensory area (BA 1), the left SMG (BA 40), the bilateral middle temporal gyrus (BA 21), the right inferior temporal gyrus and fusiform gyrus (BA 20), the right temporal pole (BA 38), and the bilateral cerebellum were activated in Case #4. Figure 6 shows that the bilateral cerebellum was activated in Case #5. Figure 2. Activated areas of Case #1 before HT (left) and after HT (middle) (p < 0.05), and increased areas in activation after HT, compared to the activation level before HT (right) (p < 0.1). Figure 3. Activated areas of Case #2 before HT (left) and after HT (middle) (p < 0.05), and increased areas in activation after HT, compared to the activation level before HT (right) (p < 0.1).
  • 8. Figure 4. Activated areas of Case #3 before HT (left) and after HT (middle) (p < 0.05), and increased areas in activation after HT, compared to the activation level before HT (right) (p < 0.1). Figure 5. Activated areas of Case #4 before HT (left) and after HT (middle) (p < 0.05), and increased areas in activation after HT, compared to the activation level before HT (right) (p < 0.1). Figure 6. Activated areas of Case #5 before HT (left) and after HT (middle) (p < 0.05), and increased areas in activation after HT, compared to the activation level before HT (right) (p < 0.1). 176
  • 9. 177 Table 5 shows a summary of the activated areas after HT in each patient (Cases #1 through #5). In the table, the letter “A” represents an increase of activation after HT, compared to the level before HT (p < 0.1). The letters “O”, “F”, “P”, “T”, and “C” represent occipital, frontal, parietal, temporal, and cerebellum, respectively. Each area number shows the Brodmann area in occipital, frontal, parietal, and temporal lobes. “L” and “R” show left and right hemispheres, respectively. The column in gray shows a disabled side in each patient. The visual areas (BAs 17 and 18), the motor area (BA 4), SMA (BA 6), the prefrontal areas (BAs 10, 11, and 47), the sensory areas (BAs 3, 1, and 2), SMG (BA 40), the middle temporal gyrus (BA 21), the inferior temporal gyrus and fusiform gyrus (BAs 20 and 37), the temporal pole (BA 38), and the left cerebellum were activated after HT to compare to the activation level before HT. These events occurred in an unaffected side of cerebellum in all patients and the occipital area in all but one. Table 5. Increased areas in activation after horticultural therapy in each patient (Cases #1 through #5). The letter “A” represents increased areas in activation after HT, compared to the level before HT (p < 0.1). The letters “O”, “F”, “P”, “T”, and “C” represent occipital, frontal, parietal, temporal, and cerebellum, respectively. Each area number shows the Brodmann area in occipital, frontal, parietal, and temporal lobes. “L” and “R” show left and right hemispheres, respectively. The column in gray shows a disabled side in each patient. Case #1 #2 #3 #4 #5 Area # L R L R L R L R L R 17 A A A A A A A O 18 A A A A A 4 A A 6 A A 10 A 11 A F 47 A 3 A 1 A 2 A A P 40 A A 21 A A 20 A 38 A A A T 37 A C A A A A A A A p < 0.1
  • 10. 178 4. DISCUSSION The effects of HT in the brain functions of cerebrovascular diseases were investigated using fMRI studies and questionnaires. The results in this paper show an increase of activations in the visual area, the motor area, SMG, sensory area, SMA, the prefrontal area, the inferior and middle temporal gyrus, the fusiform gyrus, the temporal pole, and the cerebellum. Recent fMRI studies reported that mainly recovered areas after the stroke using the routine rehabilitation were the sensory area, motor area, premotor area (PMA), cerebellum, SMA, and parietal areas[10, 11, 12]. Our results show that the visual area, the inferior temporal gyrus, the fusiform gyrus, and the SMG were activated in addition to the ordinarily recovering areas. HT could cause these differences in the process of recovering brain activities. The fusiform gyrus and the inferior temporal cortex are considered to be related to human color processing [13, 14, 15]. These color processing areas and visual areas increased their activities after HT. This result shows that processes of HT: “virtual” elements such as creating a planting plan (Figure 7-A), “viewing” nature (Figures 7-B to 7-G), “interaction”, and “action” through doing gardening jobs, under the sunlight, could have an effect on the color processing areas and visual areas in the brain. Our results show that viewing and concerning color processing might be essential in the effectiveness of HT. SMG is well known to play a roll in perception and discernment in the association area [16]. SMG might mediate a nonspatial attentional function, such as stimulus detection or alerting other areas to the appearance of a salient stimulus irrespective of a precise spatial location [17, 18]. The results presented here demonstrate that this kind of network area of the brain in addition to the motor, sensory, and visual areas increased its activities after HT. These findings suggest that the improved motor and sensory skills in the patients could be associated with reactivation or compensation of a physiological network such as SMG in the brain. Our results show that HT contributes to their activations. HT can stimulate parts of brain not always evoked through routine physical rehabilitation. HT can compensate for routine physical rehabilitation and help to improve damaged brain function. Our results from one questionnaire showed that the daily activities in total score and motor items of FIM significantly improved. Compares with other therapies such as routine physical therapy, occupational therapy, music therapy, and animal therapy, HT has the following features: (1) a patient can objectively observe vegetation growing, (2) the patient can intervene in the process of growing vegetation from seeds, (3) the patient can actually see the results of his/her efforts when the vegetation has grown, (4) the patient can amicably share his/her achievements with other people. Spontaneous rehabilitation of the patient could be encouraged by repeated successful experiences of growing plants. We think that these features can help the patient improve his/her ADL. Our results from the other questionnaire, SDS, showed that mood was not changed remarkably in most patients. For mental mood or emotional improvement, a tailor-made program of HT during a long period would be needed. Another feature of HT is its beginning or onset time. Case #1 and Case #2 began 6 months and 2 years and 8 months, respectively after the onset (Table 2). In spite of the long time after the onset of disorders, Case #1’s and Case #2’s brain function activated after HT. This activation shows that HT can effectively improve brain function even if HT begins several months or years after the onset. The time of the onset of disorders therefore, might be irrelevant, because HT contains multi-functional elements, and the patient can move from fundamental activities to complex activities. We report here changes in brain function of five cases after HT. Now we are planning to
  • 11. 179 target a larger number of patients who will participate in HT and we will investigate their brain activities through a quantitative statistical analysis in the future. We are also planning to compare patients given HT with patients not given HT. These five case studies proved the possibility that HT accelerates an improvement of activities in the “visual and color processing area” and the “association area” of brains in the patients with cerebrovascular diseases. Moreover, HT can also help to contribute to improvement in the patients’ ADL. We think the research presented here is necessary to accomplish further studies. ACKNOWLEDGEMENTS This work is partially supported by a Grant-in-Aid from the Ministry of Education, Culture, Sports, Science and Technology, JP (19500393). APPENDIX A. Creating a planting plan B. Selecting seedlings for flowerbeds C. A flowerbed before weeding D. A flowerbed soon after planting
  • 12. E. A flowerbed a month after planting F. Flowerbeds and flowerpots planted by patient G. Watering Figure 7. Scenes from Horticultural Therapy Programs 180
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  • 14. 182 Research Fellow in the Department of Neurology, Johns Hopkins University, Baltimore, MD. Since 2004, she has been an Associate Professor in the Graduate School of Applied Informatics, University of Hyogo, Kobe, Japan. She is a Certifying Physician of The Japanese Society of Psychiatry and Neurology, and a Certifying Physician & Electroencephalographer of Japanese Society of Clinical Neurophysiology. Syoji Kobashi is an associate professor in Graduate School of Engineering, University of Hyogo, Japan. His research interests include soft computing approach to medical signal/image processing and human brain functions. He received the Joseph F. Engelberger Best Paper Award at the 2nd World Automation Congress in 2000, the IEEE EMBS Japan Young Investigators Competition from IEEE EMBS Japan Chapter in 2003. Yutaka Hata is a professor in Graduate School of Engi-neering, University of Hyogo, Japan. He spent one year in BISC Group, Uni-versity of California at Berkeley from 1995 to 1996 as a visiting scholar. He is the Founding Editor-in-Chief of the International Journal of Intelligent Computing in Medical Sciences and Image Processing, and the re-gional editor of Intelligent Automation & Soft Computing. He received Joseph F. Engelber-ger Best Paper Award and Best Paper Award at the WAC2000, USA. and WAC Contribution Award, at 2002, 2004 and 2006. Osamu Ishikawa is a Vice-President of Ishikawa Hospital, Japan. He is also the President of A Geriatric Health Services Facility, SEIYOU. His research interests are in medical imaging, surgery systems, and care systems for elderly persons. Fusayo Asano, Ph.D. in Agriculture, is a professor of Labora-tory of Plant Assisted Therapy, Department of Bio- therapy, faculty of Agriculture, Tokyo University of Agri-culture, Japan. She is a Horticultural Therapist Master at the American Horticultural Therapy Association and re-ceived Rhea McCandliss Professional Service Award in 2004 for her contribution to the field of horticultural therapy, especially in educa-tion. She is a founding director of the Japanese Society of People-Plant Relationships and Japanese Horticultural Therapy Association.