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ERIC Number: ED141326
Record Type: Non-Journal
Publication Date: 1977
Pages: 19
Abstractor: N/A
Reference Count: N/A
Movement Precision and Amplitude as Separate Factors in the Control of Movement.
Kerr, Robert
The purpose of this study was to assess Welford's dual controlling factor interpretation of Fitts' Law--describing movement time as being a linear function of movement distance (or amplitude) and the required precision of the movement (or target width). Welford's amplification of the theory postulates that two separate processes ought to be distinguished, a faster one concerned with distance covering and a slower one for homing onto the target. Twenty subjects, all scuba divers, were required to perform a reciprocal tapping task. In an attempt to separate the two factors, the subjects were tested on land and underwater. This did not change the basic parameters of the task but did put the subjects under informational stress in that underwater the movement was less ballistic in nature and, therefore, would require the processing of more information (feedback) in order to complete the task. The land data appeared to support Fitts in that the contributions of movement amplitude and precision were approximately equal. However, the relative changes in contribution of these factors to movement time underwater suggests that these parameters do in fact represent separate controlling factors. (Author/MB)
Publication Type: Reports - Research
Education Level: N/A
Audience: N/A
Language: N/A
Sponsor: N/A
Authoring Institution: N/A