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Corrective saccades influence velocity judgments and interception.

Alexander Goettker1, Eli Brenner2, Karl R Gegenfurtner3

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This summary is machine-generated.

Corrective saccades, or quick eye movements, alter how we perceive moving objects. These eye movements also bias our ability to intercept, or catch, those objects, especially when occurring just before the action.

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Area of Science:

  • Neuroscience
  • Vision Science
  • Human Motor Control

Background:

  • Humans track moving objects using smooth pursuit and corrective saccades.
  • Corrective saccades influence the perceived velocity of moving objects.
  • The impact of corrective saccades on object interception remains less understood.

Purpose of the Study:

  • To investigate if corrective saccades, which alter velocity perception, also introduce biases in object interception.
  • To compare the effects of corrective saccades on velocity judgments versus interception accuracy.

Main Methods:

  • Participants tracked moving targets with their gaze.
  • Separate sessions involved judging target velocity or intercepting targets by tapping.
  • Trials were categorized based on pure pursuit versus pursuit with corrective saccades.

Main Results:

  • Interception errors were shifted in line with how corrective saccades affected velocity judgments.
  • The timing of corrective saccades influenced interception errors, but not velocity judgments.
  • Saccades occurring ~100 ms before interception had a greater impact on endpoint error.

Conclusions:

  • Corrective saccades create biases in both perceived velocity and object interception.
  • The timing of corrective saccades is crucial for their impact on interception accuracy.
  • Earlier corrective saccades in interception tasks may be a strategy to mitigate these biases.