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The Gap effect for spatially oriented responses.

J Pratt1, H Bekkering, R A Abrams

  • 1Department of Psychology, University of Toronto, Ont., Canada. pratt@psych.utoronto.ca

Acta Psychologica
|July 27, 1999
PubMed
Summary
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The gap effect, a faster response when a fixation point disappears before a target appears, was observed in both eye and hand movements. This suggests a shared neural mechanism for spatially oriented actions.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Motor Control

Background:

  • The gap effect, characterized by reduced reaction times when a fixation point is removed before target onset, is well-documented for saccadic eye movements.
  • Recent studies extended the gap effect to aimed hand movements, but its presence in simple keypress responses remains unclear.

Purpose of the Study:

  • To investigate the hypothesis that the hand gap effect extends to various spatially oriented movements.
  • To explore the underlying neural mechanisms potentially involving the superior colliculus.

Main Methods:

  • Two experiments were conducted, involving spatially oriented detection tasks with peripheral targets.
  • Experiment 1: Subjects performed eye and hand movements to a known target location.
  • Experiment 2: The temporal gap duration (0-400 ms) was systematically varied.

Related Experiment Videos

Main Results:

  • A significant gap effect was observed for both eye and hand responses in a spatially oriented detection task.
  • The duration of the temporal gap influenced the magnitude of the gap effect similarly for both eye and hand movements.
  • These findings suggest a common underlying mechanism for the gap effect in saccadic and manual pointing movements.

Conclusions:

  • The gap effect is confirmed for spatially oriented hand movements.
  • The results support the hypothesis of a shared neural basis for the gap effect in different motor systems.
  • The superior colliculus is implicated as a potential neural substrate for these observed effects.