Effects of Practice with Foot- and Hand-Operated Secondary Input Devices on Performance of a...

Effects of Practice with Foot- and Hand-Operated Secondary Input Devices on Performance of a Word-Processing Task

Fredrick P. Garcia Kim-Phuong L. Vu

Center for Usability in Design and AccessibilityCalifornia State University, Long Beach

Keyboard and mouse are commonly used with the computer

No good alternative to the keyboard Mouse works well with GUIs Hands work quickly and accurately

Performance might improve when multiple effectors provide input

Mouse and trackball add to cumulative trauma disorders [1, 2, 3]

Hands-only adds homing time [4] Opportunity to carry out tasks in

parallel Possibly reduced switch cost using

different effectors [5]

Previous research found the foot slower than the hand but…

All previous research shows slower performance with the foot [7, 8, 9]

None of the research equated ability or familiarity using foot

and hand devices

explored practice with the foot

explored word processing tasks requiring foot and hand input

What happens when participants get practice with a foot controlled device?

Commercial foot specific input device

Tasks requiring keyboard and secondary device input

Hand input device that is not overpracticed

Practice with the input devices

Two hypotheses on performance with practiced foot and hand devices

H1: Practice will improve performance regardless of device.

H2: Practice will improve performance more with the foot mouse than with the hand trackball.

(performance measured by total time for task completion)

Experiment Schedule

Test-session 1Session 1 (prepractice)

Practice-sessions Sessions 2 – 9

Test-session 2 Session 10 (postpractice)

Practice hand

trackball group

(8)

Test hand trackball(not practiced)

Practice hand trackball Test hand trackball(practiced)

Test foot mouse (not practiced)

No practice with foot mouse Test foot mouse (not practiced)

Practice foot mouse

group(8)

Test foot mouse (not practiced)

Practice foot mouse Test foot mouse (practiced)

Test hand trackball(not practiced)

No practice with hand trackball Test hand trackball(not practiced)

Sample practice session screens1. Click the Start Block of

Trials button

2. Scroll down to find the 1 button and click on it

3. Scroll down to find the text to be highlighted; select the text

4. Scroll up to find the 2 button and click on it

5. When ready for the next trial, click the Start next Trial button

Task 1

Task 2

d2(rv1)/dt2=-rv

1/rv3+m(-dmv/dmv

3-rm/rm3)

Task 3

Scroll down

Task 4

The teacher had the students turn to Section 2 in their Modern Mathematics1 textbook, which had replaced their previous text: Old Math2. The day’s math lesson was on variables together with exponents, like x5. The teacher was going to review the Pythagorean Theorem3, where a2 + b2 = c2, as an example. She also wanted to talk about finding the area of a circle using the formula r2, where r stands for the circle’s radius. After Math, she was going to give a Chemistry lesson. She was going to begin by discussing H2O, which she was sure everyone would know about.

Performance on Test Sessions 1 and 2

0 1 2 350

100

150

200

250

300

350

400

450

500

Hand-Hand

Hand-Foot

Foot-Hand

Foot-Foot

Practiced Device-Operated Device

Test SessionMea

n

Tas

k C

om

ple

tio

n T

ime

(se

c)

0 1 2 350

100

150

200

250

300

350

400

450

500

Hand-Hand

Hand-Foot

Foot-Hand

Foot-Foot


Test SessionMea

n

Tas

k C

om

ple

tio

n T

ime

(se

c)

0 1 2 350

100150200250300350400450500550600

Hand-Hand

Hand-Foot

Foot-Hand

Foot-Foot


Test SessionMea

n

Tas

k C

om

ple

tio

n T

ime

(se

c)

0 1 2 3300

400

500

600

700

800

900

1000

Hand-Hand

Hand-Foot

Foot-Hand

Foot-Foot


Test SessionMea

n

Tas

k C

om

ple

tio

n T

ime

(se

c)

T1 T2

T3 T4

Practice improved performance with the foot mouse; not the hand trackball

H1 – Practice improves performance regardless of device

H2 – The foot shows more improvement with practice than the hand

Not Supported

Supported

Thank You

www.csulb.edu/centers/cuda

[email protected]

1. Jensen C., Borg, V., Finsen, L., Hansen, K., Juul-Kristensen, B., Christensen, H.. Job Demands, Muscle Activity and Musculoskeletal Symptoms in Relation to Work with the Computer Mouse. Scandinavian Journal of Work and Environmental Health 24, 418--424 (1998)

2. Fagarasanu, M., Kumar, S.. Carpal Tunnel Syndrome Due to Keyboarding and Mouse Tasks: A Review. International Journal of Industrial Ergonomics 31, 119--136 (2003)

3. Burgess-Limerick, R., Shemmell, J., Scadden, R., Plooy, A.. Wrist Posture During Computer Pointing Device Use. Clinical Biomechanics 14, 280--286 (1999)

4. Card, S.K., Moran, T.P., Newell, A.. The Keystroke-Level Model for User Performance Time with Interactive Systems. Communications of the ACM 23(7), 396--410 (1980)

5. Monsell, S.. Task Switching. TRENDS in Cognitive Sciences 7(3), 134--140 (2003)7. Pearson, G., Weiser, M.. Exploratory Evaluation of a Planar Foot-Operated Cursor-

Positioning Device. In: J. J. O'Hare (ed.), Proceedings of the SIGCHI Conference on Human Factors in Computing Systems - CHI ’88, pp. 13--18. ACM Press, New York (1988)

8. Springer, J., Siebes, C.. Position Controlled Input Device for Handicapped: Experimental Studies with a Footmouse. International Journal of Industrial Ergonomics 17, 135--152 (1996)

9. Pakkanen, T., Raisamo, R.. Appropriateness of Foot Interaction for Non-accurate Spatial Tasks. In: CHI '04 Extended Abstracts on Human Factors in Computing Systems, pp. 1123--1126. ACM Press, New York (2004)

References

Comparisons of Foot Mouse and Hand Trackball Before and After Practice

1 250

100150200250300350400450500550600

Foot MouseHand Trackball

Operated Device

SessionMea

n T

ask

Co

mp

leti

on

T

ime

(sec

)

1 250

100150200250300350400450500550600


Operated Device

SessionMea

n T

ask

Co

mp

leti

on

T

ime

(sec

)

1 20

50100150200250300350400450500550600650


Operated Device

SessionMea

n T

ask

Co

mp

leti

on

T

ime

(sec

)

1 20

100

200

300

400

500

600

700

800

900Foot MouseHand Trackball

Operated Device

SessionMea

n T

ask

Co

mp

leti

on

T

ime

(sec

)

T1 T2

T3 T4

Average Participant Familiarity and Comfort Ratings of Input Devices

Rated aspect of device Practiced device Rated device

Hand trackball Foot mouse Hand mouse

Comfort on Day 1

Hand trackball 4.13 4.88

Foot mouse 3.63 4.38

Comfort on Day 10

Hand trackball 2.00 4.13 1.25

Foot mouse 2.75 2.63 1.13

Familiarity on Day 1(from Demographic Qs)


Foot mouse 3.71 4.86 1.43

Familiarity on Day 10


Foot mouse 3.00 3.50 1.13

Effects of Practice with Foot- and Hand-Operated Secondary Input Devices on Performance of a...

Documents

Transcript of Effects of Practice with Foot- and Hand-Operated Secondary Input Devices on Performance of a...