1. ÉCOLE POLYTECHNIQUE
FÉDÉRALE DE LAUSANNE
Technologies for
Vocational Education and Training
Scaling-up TapaCarp
Mina Shirvani
8.04.2014

2. Problem
• High hardware and maintenance cost of TapaCarp
• Idea: develop a cheap web-based version: eTapaCarp
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TapaCarp eTapaCarp

3. Research question
• Does the split of input and output planes affect the performance?
• Do gaze patterns vary when the feedback is displayed on the
same plane as the input, versus on a computer display?
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4. Experiment conditions
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Co-located
(TapaCarp)
Discrete
(eTapaCarp)

5. Experiment Setup
• Task: edge finding activity
– finding highlighted edges on a tangible block,
on the three orthographic projections
– 10 questions
• Participants
– 18 EPFL students from MT and ME sections
– 9 participants per condition
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6. Experiment Flow
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Questionnaire
(age, gender,
academic
background…)
Pretest
•Mental Rotation (12
questions, 3 min)
•Paper Folding (10
questions, 3 min)
Demonstration
10 edge finding
Questions
Final interview

7. Results
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• Part 1: Performance
– Duration of activity
– Accuracy of response
– Movement of block
• Part 2: Gaze pattern analysis
– Time spent on each AOI
– Number of glances
– Duration of glances
– Revisit time
– Transitions among AOIs

8. Duration of the activity
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• eTapacarp: m=516.26, SD=207.36
• Tapacarp: m=619.88, SD=160.34
• Not significant : F[1,16]=1.4, p=0.25

9. Number of correctly completed questions
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TapaCarp: m=8.33, SD=1.87
eTapaCarp: m=7.89, SD=2.14

10. Block movement
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Significant difference: F[1,16]=5.9, p=0.026
Not significant difference:
F[1,16]=2.12, p=0.16
Significant difference: F[1,16]=7.28, p=0.015

11. Glances on AOIs
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12. Transition graph
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around 85% b.w views and object around 60% b.w views and object

13. 2-way transitions b.w. views and object
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17%
31%
52%
Transition type: front to obj side to obj top to obj
38%
35%
27%
Significant differences:
• side : F[1,16]=5.63, P=0.03
• top: F[1,16]=10.78 , P=0.0047

14. Summery
• No significant difference in accuracy and duration of the
activity in both conditions
• Presence of some differences between the gaze patterns in
the two conditions
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15. Thanks
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