Assessing mobile touch interfaces for tetraplegics

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 Nicolauhman@vimmi.inesc-id.pt