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Compression of time in double-step saccades
1Institute for Experimental Psychology, Heinrich Heine University Düsseldorf, Düsseldorf, Germany.
Journal of Neurophysiology
|May 29, 2024
Summary
Time perception is compressed during saccades. Motor planning, not just execution, influences this temporal compression, with peak compression occurring before the second saccade in a double-step paradigm.
Area of Science:
- Neuroscience
- Perception
- Cognitive Science
Background:
- Saccades, rapid eye movements, are known to compress perceived time.
- The precise role of saccade motor planning versus execution in this temporal compression remains unclear.
Purpose of the Study:
- To investigate whether saccadic temporal compression is linked to motor planning or saccade execution.
- To dissociate the effects of planning and execution using a double-step saccade paradigm.
Main Methods:
- Subjects performed double-step saccades, with temporal intervals presented around saccade execution.
- A two-interval forced-choice task was used to assess perceived duration.
- Temporal compression was compared between double-step and single saccades.
Main Results:
- Temporal intervals were compressed during the first saccade, peaking at saccade onset.
- Compression also occurred around the second saccade, but peaked approximately 70 ms before onset.
- No significant difference in compression magnitude was found between double-step and single saccades, but timing differed.
Conclusions:
- Saccade motor planning significantly influences time perception.
- The temporal shift in peak compression during the second saccade suggests planning contributes to temporal distortions.
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