Journal article
Evaluation of an isometric and a position joystick in a target acquisition task for individuals with cerebral palsy
IEEE transactions on rehabilitation engineering, v 8(1), pp 118-125
01 Jan 2000
PMID: 10779115
Abstract
Individuals with cerebral palsy (CP) with upper limb disability have difficulty operating standard computer input devices such as, a mouse and a keyboard. The present study evaluated the performance of unimpaired individuals and those with CP in the use of a zero-order spring-centered position joystick and a zero-order isometric joystick when interacting with the computer. We hypothesize that the isometric device due to its stiff resistance would provide better control on cursor movement than the position joystick. The subjects acquired differently sized targets at different distances by positioning a cursor on the target. Performance with the position joystick was superior to that of the isometric joystick. The time to acquire the target was directly proportional to the cursor-target distance A, and indirectly proportional to the target size W. Subjects chose to move more slowly toward the smaller and closer targets and they increased speed for larger and more distant targets. The phase-plane diagram that plots values of the velocity profile of the cursor over its displacement revealed the presence of one large amplitude movement that accounts for the peak velocity of the cursor, and several submovements. Fitts' index of difficulty, log sub(e) (2W/A) was found to be a good predictor of the movement time in a cursor positioning task for both, unimpaired individuals and those with CP.
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Details
- Title
- Evaluation of an isometric and a position joystick in a target acquisition task for individuals with cerebral palsy
- Creators
- Raghavendra Rao - Temple University HospitalRami SeliktarTariq Rahman
- Publication Details
- IEEE transactions on rehabilitation engineering, v 8(1), pp 118-125
- Publisher
- The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- School of Biomedical Engineering, Science, and Health Systems; [Retired Faculty]
- Web of Science ID
- WOS:000087191900014
- Scopus ID
- 2-s2.0-0034066443
- Other Identifier
- 991019167882404721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Engineering, Biomedical
- Rehabilitation