Preparation and control of rapid, multisegmented responses in simple and choice environments
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ABSTRACT:
The purposes of this study were to investigate the assumption of complete programming prior to movement initiation and to compare predictions of the reaction time (RT) paradigm Hierarchical Editor (HED) with other programming models. Three experiments are reported in which subjects were required to tap either one, two, or three plates as rapidly as possible in either a simple HED or choice RT situation. The results were very consistent in these experiments even with several modifications in apparatus and methodology. Of particular interest were effects of movement complexity on RT and movement time (MT) for the first and second segments of the movement (M1 and M2). Choice RT (CRT) results consistently showed no increases in RT as the number of movement segments increased but showed significant increases in M1. For simple RT situations, however, there were small but consistent increases in RT as well as increases in M1 with increases in the number of movement parts. For both CRT and SRT results, small but nonsignificant increases were noted for M2. These results provide evidence for incomplete programming prior to response initiation. Although the SRT data can be accomodated by Henry's Theory, the HED model appears to offer the best overall fit for the results.
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