Document Detail

A method for evaluating head-controlled computer input devices using Fitts' law.
MedLine Citation:
PMID:  2150065     Owner:  NLM     Status:  MEDLINE    
The discrete movement task employed in this study consisted of moving a cursor from the center of a computer display screen to circular targets located 24.4 and 110.9 mm in eight radial directions. The target diameters were 2.7, 8.1, and 24.2 mm. Performance measures included movement time, cursor path distance, and root-mean-square cursor deviation. Ten subjects with no movement disabilities were studied using a conventional mouse and a lightweight ultrasonic head-controlled computer input pointing device. Average movement time was 306 ms greater (63%) for the head-controlled pointer than for the mouse. The effect of direction on movement time for the mouse was relatively small compared with the head-controlled pointer, which was lowest at 90 and 270 deg, corresponding to head extension and head flexion, respectively. Average path distance and root mean square displacement was lowest at off-diagonal directions (0, 90, 180, and 270 deg). This methodology was also shown to be useful for evaluating performance using an alternative head-controlled input device for two subjects having cerebral palsy, and measured subtle performance improvements after providing a disabled subject with lateral torso support.
R G Radwin; G C Vanderheiden; M L Lin
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Human factors     Volume:  32     ISSN:  0018-7208     ISO Abbreviation:  Hum Factors     Publication Date:  1990 Aug 
Date Detail:
Created Date:  1991-04-15     Completed Date:  1991-04-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0374660     Medline TA:  Hum Factors     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  423-38     Citation Subset:  IM; S    
Department of Industrial Engineering, University of Wisconsin, Madison 53706.
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MeSH Terms
Cerebral Palsy / psychology,  rehabilitation*
Communication Aids for Disabled*
Computer Peripherals*
Disabled Persons* / psychology
Psychomotor Performance*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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