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Signal processing during and across saccades

L L van Duren1, A F Sanders

  • 1Department of Psychology, Free University, Amsterdam, The Netherlands.

Acta Psychologica
|July 1, 1995
PubMed
Summary
This summary is machine-generated.

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Visual processing and cognitive tasks like target classification and response selection can occur during eye movements (saccades), not just during fixations. This challenges previous assumptions about visual perception limitations.

Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Visual perception

Background:

  • Traditionally, visual perceptual processing was believed to occur exclusively during eye fixations.
  • The extent to which postperceptual processes, such as target classification and response selection, occur during saccades remains an open question.

Purpose of the Study:

  • To investigate whether target classification and response selection can continue during saccadic eye movements.
  • To determine if these cognitive processes are limited to fixation periods.

Main Methods:

  • Experiments involved presenting two visual signals (S1 and S2) at a large angular distance.
  • Subjects fixated S1, identified it as a target or non-target, and then saccaded to S2.
  • Response selection was assessed by manipulating stimulus-response compatibility and saccade size.

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Main Results:

  • Target classification of S1 could occur during the saccade to S2, as evidenced by set size effects on S2 fixation duration.
  • Further experiments confirmed that target classification can indeed proceed during saccades.
  • Response selection was also found to continue during saccades, with compatibility effects diminishing for larger saccades.

Conclusions:

  • Cognitive processes, including target classification and response selection, are not strictly confined to eye fixations.
  • These processes can effectively occur and be completed during saccadic eye movements.
  • The findings challenge traditional models of visual processing and attention during naturalistic eye movements.