assessing mobile touch interfaces for tetraplegics
TRANSCRIPT
Assessing Mobile Touch Interfaces
for Tetraplegics
Tiago Guerreiro
Hugo Nicolau Joaquim Jorge
Daniel Gonçalves
Mobile evolution …
Touch Interfaces
Leading to …
pleasant
Tactile feedback
loss of tactile feedback
Loss of physical stability
hard to select targets
it occurs to everyone
… and motor impaired
require less strength
Adapt to users’ needs
Provide the knowledge to build better touch interfaces
We performed …
Tested several …
Interaction Techniques
Screen areas …
… corners
Screen areas …
… edges
7 mm
… and target sizes
12 mm 17 mm
Tapping
Crossing
Exiting
Gesturing
15 participants 28-64 years old
C4-C7 lesion level 6 left-handed
never used touchscreens
Focus on …
Tapping
Target Size
H0 Target size has no influence
on task errors
Target Size
Target Size
H0 Target size has no influence
on task errors
[F=25.110 p<.001]
Corner Targets
H0 Task errors are not dependent on the target’s position (corner vs center)
7mm 12mm 17mm
35% 35% 27% 27% 22% 22%
45% 24% 20%
35% 35% 27% 27% 22% 22%
Corner Targets
Corner Targets
H0 Task errors are not dependent on the target’s position (corner vs center)
[p>.05]
Edge Targets
H0 Task errors are not
dependent on the target’s
position (edge vs center)
7mm 12mm 17mm
45% 23% 22%
45% 40%
45% 23% 26%
23% 22% 19%
22%
45% 23% 22%
Edge Targets
Edge Targets
H0 Task errors are not
dependent on the target’s
position (edge vs center)
[p>.05]
7mm 12mm 17mm
Edge Targets
53% 27% 20%
61% 33% 28% 11% 24% 22% 11% 11% 22%
37% 30% 13%
44% 33% 31%
37% 44% 41% 41% 27% 7% 52% 23% 18%
53% 11% 7%
Left
Right
Vertical Areas
H0 Task errors are not
dependent on the target’s
position (top vs bottom vs
center)
45% 28% 27%
39% 28% 24%
43% 19% 12%
7mm 12mm 17mm
Vertical Areas
Vertical Areas
H0 Task errors are not
dependent on the target’s
position (top vs bottom vs
center)
Largest [p<.05] Medium [p<.01]
Suggestions for...
Tapping
Regarding target size …
12 mm
However, error rates are still …
High
Regarding target position …
Support
Remaining interaction techniques Differences between able-bodied and tetraplegics
Future Work
The End Hugo Nicolau [email protected]