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Assessing Mobile Touch Interfaces
for Tetraplegics
Tiago Guerreiro
Hugo NicolauJoaquim Jorge
Daniel Gonçalves
Mobile evolution …
Touch Interfaces
…Le a d in g t o
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
Wobbrock, EdgeWrite, 2003
Froehlich, Barrier Pointing, 2007
Provide the knowledge to build better touch interfaces
…We p e r f o rm e d
…Te s t e d s e v e r a l
InteractionTechniques
…S c r e e n a r e a s
… c o r n e r s
…S c r e e n a r e a s
… e d g e s
…S c r e e n a r e a s
… m id d le a r e a s
7 mm
… a n d t a r g e t s iz e s
12 mm 17 mm
Ta p p in g
C r o s s in g
E x it in g
G e s t u r in g
15 participants28-64 years old
C4-C7 lesion level6 left-handed
never used touchscreens
…F o c u s o n
Tapping
Ta r g e t S iz e
0H Targe t s iz e has no influe nce on task e rrors
Ta r g e t S iz e
Ta r g e t S iz e
0H Targe t s iz e has no influe nce on task e rrors
[F=25.110 p<.001]
C o r n e r Ta r g e t s
H0Task errors are not dependent on the target’s position (corner vs center)
7mm 12mm 17mm35%
35%
27%
27%
22%
22%
4 5 % 2 4 % 2 0 %
35%
35%
27%
27%
22%
22%
C o r n e r Ta r g e t s
C o r n e r Ta r g e t s
0H Task errors are not dependent on the target’s position (corner vs center)
[p>.05]
E d g e Ta r g e t s
0H Task e rrors are not de pe nde nt on the targe t’s pos ition (e dge v s ce nte r)
7mm 12mm 17mm
4 5 % 2 3 % 2 2 %
45%
4 0 % 45%
23%
2 6 % 23%
22%
19 % 22%
4 5 % 2 3 % 2 2 %
E d g e Ta r g e t s
E d g e Ta r g e t s
0H Task e rrors are not de pe nde nt on the targe t’s pos ition (e dge v s ce nte r)
[p>.05]
7mm 12mm 17mm
E d g e Ta r g e t s
5 3 % 2 7 % 2 0 %
6 1% 3 3 %
28%
11% 2 4 %
22%
11% 11%
22%
3 7 % 3 0 % 13 %
4 4 % 3 3 % 3 1%
37%
4 4 % 4 1%
4 1% 2 7 % 7
%52%
2 3 % 1 8%
5 3 % 11% 7 %
Left
Right
Ve r t ic a l A r e a s
0H Task e rrors are not de pe nde nt on the targe t’s pos ition (top v s bottom v s ce nte r)
45% 28% 27%
39% 28% 24%
43% 19% 12%
7mm 12mm 17mm
Ve r t ic a l A r e a s
Ve r t ic a l A r e a s
0H Task e rrors are not de pe nde nt on the targe t’s pos ition (top v s bottom v s ce nte r)
Largest [p<.05]Medium [p<.01]
. . .S u g g e s t io n s f o r
Tapping
…R e g a r d in g t a r g e t s iz e
12 mm
, …H o w e v e r e r r o r r a t e s a r e s t i l l
High
…R e g a r d in g t a r g e t p o s it io n
Support
Remaining interaction techniques
Differences between able-bodied and tetraplegics
F u t u r e Wo r k
The EndHugo [email protected]
