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Related Experiment Videos

Predictability influences stopping and response control.

Sharon Morein-Zamir1, Romeo Chua, Ian Franks

  • 1Psychology Department, University of British Columbia, Vancouver, BC, Canada. sm658@cam.ac.uk

Journal of Experimental Psychology. Human Perception and Performance
|February 22, 2007
PubMed
Summary
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Stopping behavior is not always resistant to expectations. When response options are limited, expectations influence both stopping and accelerating, challenging previous research on response control.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Motor Control

Background:

  • Stopping is a fundamental aspect of response control, crucial for adapting behavior in dynamic environments.
  • Existing research suggests stopping is largely insensitive to anticipatory biases or expectancies.
  • The representativeness of stopping as a measure of response control requires further empirical validation.

Purpose of the Study:

  • To investigate the influence of expectancies on stopping performance in a continuous tracking task.
  • To determine if stopping is a representative measure of response control across different experimental conditions.
  • To challenge the established view of stopping's insensitivity to expectancies.

Main Methods:

  • Participants performed a continuous tracking task, adjusting response force to control a marker's speed.

Related Experiment Videos

  • Auditory signals prompted participants to either stop or accelerate the marker on a variable percentage of trials.
  • Experiments manipulated the possibility of a trade-off between stopping and accelerating to isolate expectancy effects.

    • Main Results:

    • When a trade-off between stopping and accelerating was possible, stopping performance remained resistant to expectancies.
    • In conditions with limited or no trade-off, expectancies similarly influenced both stopping and accelerating behaviors.
    • These findings indicate that expectancy effects on stopping are condition-dependent.

    Conclusions:

    • The study demonstrates that stopping is not universally resistant to expectancies, contrary to prior assumptions.
    • When response options are constrained, expectancies significantly modulate stopping behavior.
    • Under such conditions, stopping is confirmed as a representative measure of response adjustment and control.