7. Sensory Cortex
Area 5 integrates tactile
information from mechanoreceptors
in the skin with proprioceptive
inputs from the underlying muscles
and joints.
This region also integrates
information from the two hands.
Area 7 receives visual as well as
tactile and proprioceptive inputs,
allowing integration of stereognostic
and visual information.
The posterior parietal cortex
projects to the motor areas of the
somatic frontal lobe and plays an important
Proprioceptiv
role in sensory initiation and
e
guidance of movement.
27. Either Temporal dysfunction
Auditory
– Threshold of brief auditory stimuli elevated
– Spoken words less clear
– Distorted words are less clear
– Difficulty in equalizing sound presented to both ear
– Rapidly presented words and number in both ear difficult to
perceiving
Hallucination
– Auditory,
– visual,
– olfactory and
– gustatory
Emotional and behavioral changes
Delirium
28. Left temporal dysfunction
Auditory deficits (right ear)
– Intracranial localization of sound is impaired.
– Increased threshold for perception of short bursts of sound.
– Increased threshold for some frequencies.
– Failure to perceive brief simultaneous auditory stimulation.
Visual deficit (both eyes)
– Upper right quadrantanopsia.
Other complex sensory deficits
– Right hand tactile performance difficulty.
– Right hand finger agnosia.
29. Left temporal dysfunction
Language deficits
– Decoding of speech sounds (phonemes) is impaired.
– Problems with verbal repetition.
– Problems with auditory comprehension of speech.
– Receptive aphasia (deficits in all language qualities).
– Impairment of dichotic listening to verbal material.
– Intellectual impairment on verbally mediated intellectual
processes.
Memory impaired for verbal material.
Emotional disturbances
– Perceptual distortions, alterations of mood, obsessional
thinking, psychosis, temper outbursts, hypo and hypersexuality
30. Right Temporal dysfunction
Right temporal lesion effects tend to be 3. Auditory analysis (nonverbal)
notable statistically but of less – Impairment of short-term auditory
clinical significance. memory.
1.Visual analysis (nonverbal primarily) – Perception of short sounds
– Impairment of simple and complex impaired.
visual analysis, but some negative – Impaired recognition of familiar
findings. sounds.
– Impairment of short-term
– Impaired tonal discriminations,
nonverbal memory.
timbre discriminations, and
– Impaired perception of
amplitude discriminations.
tachistoscopically-presented
letters. – Amusia.
– Prosopoagnosia (especially with – Impairment of contralateral ear
anterior lesions). input in dichotic listening.
– Impaired recognition of objects
seen from unusual angles
31. Right Temporal dysfunction
4. Constructional tasks 6. Psychometric findings
– Visual construction impairment – Temporary decline in
proportional to tissue loss. Performance IQ following
– Impairment in maze learning lobectomy.
(visual and proprioceptive – Impairment on WAIS Picture
feedback). Arrangement.
– Enlarged left-hand margin in – Impairment on Binet Memory
dictation. for Designs
5. Psychiatric personality – Possible impairment of WAIS
phenomena with right temporal Block Design?.
epilepsy 7. Persistence in maintaining a
– Personality changes. hypothesis even after being
– Psychiatric symptoms. informed it was not correct.
– Deja vue.
– Metamorphopasias.
32. Bitemporal dysfunction
Human bitemporal lesion
– Kluver bucy like + aphasia, amnesia and bulimia
Bilateral inferior and medial temporal lesion
– Sham rage like
– React to every stimuli with extreme belligerence, screaming, cursing ,
biting and spiting
Bilateral post cortical lesion
– Cortical deafness – unaware of deafness
Korsakoff amnesic defect
36. Unilateral occipital lesion
Contralateral (congruent) homonymous hemianopia, may be
central (spitting the macula or peripheral
Homonymous hemiachromatopsia
Elementry unformed hallucination – irritative lesions
37. Left occipital lesion
Right homonymous hemianopia
Alexia and color naming defect with deep white matter or
splenium of corpus callosum involved
Visual object agnosia
38. Right occipital lesion
Left homonymous hemianopia
Visual illusion, (metamorphopsias), and hallucinations
Loss of topographic memory and visual orientation
39. Bilateral occipital lesions
Cortical blindness
Anton syndrome
Loss of perception of color
Prosopognosia and simultagnosia
Balint syndrome
40. Balint Syndrome (Bilateral parietooccipital region)
An inability to look voluntarily into the peripheral field, with normal
eye movements (psychic paralysis of fixation gaze)
A failure to precisely grasp or touch an object under visual
guidance, hand and eyes in- coordinated (optic ataxia)
Visual inattention affecting mainly the periphery of the visual field,
attention to other sensory stimuli being intact
Failure to properly direct occulomotor function in the exploration of
space (amorphosynthesis)
