The time course of effort mobilization and strategic adjustments of response criteria |
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Authors: | Kleinsorge T |
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Institution: | Institut für Arbeitsphysiologie an der Universit?t Dortmund, Ardeystrasse 67, 44139 Dortmund, Germany. kleinsorge@arb-phys.uni-dortmund.de |
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Abstract: | In two-choice reaction time experiments, participants were instructed within a variable precueing interval to speed up responding
in 20% of trials and to maintain their basic level of performance in the remaining trials. The achievement of this goal was
rewarded by a monetary bonus. The requirement to speed up was signaled at varying intervals before the onset of the imperative
stimulus. The main questions to be answered were whether participants would be able to dynamically adjust their response speed,
and if so, whether a speed up would be due to enhanced effort with a genuine improvement of performance or due to an adjusted
response criterion, accompanied by a speed-accuracy trade-off. The data of both experiments suggest that participants were
able to invest some extra effort, the amount of which varied as a function of the length of the precueing interval. This speed-up
was evident already in the fastest bins of the reaction time distribution, indicating a continuous modulation of processing
efficiency. Only in the first experiment was there clear evidence for a speed-accuracy trade-off in addition to effort mobilization.
Received: 14 March 2000 / Accepted: 2 March 2001 |
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Keywords: | |
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