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Related Experiment Videos

Action, arousal, and subjective time.

Kielan Yarrow1, Patrick Haggard, John C Rothwell

  • 1Sobell Department of Motor Neuroscience and Movement Disorders, Institute of Neurology, Queen Square, U.C.L., London WC1N 3BG, UK. k.yarrow@ion.ucl.ac.uk

Consciousness and Cognition
|May 12, 2004
PubMed
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Saccadic chronostasis, the perceived time delay after eye movements, was studied. Findings suggest arousal is not the cause, but rather timing onset processes influence this temporal illusion.

Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Psychophysics

Background:

  • Saccadic chronostasis is the subjective temporal lengthening of visual stimuli post-eye movement.
  • Existing models propose an internal clock mechanism, suggesting increased arousal after saccades causes temporal overestimation.
  • This study investigates the role of internal clock speed and arousal in saccadic chronostasis.

Purpose of the Study:

  • To test the hypothesis that saccadic chronostasis results from increased internal clock speed due to arousal.
  • To determine if the chronostasis effect is proportional to stimulus duration.
  • To explore alternative explanations for saccadic chronostasis beyond arousal-based clock speed changes.

Main Methods:

  • Duration discrimination tasks were used to quantify saccadic chronostasis.

Related Experiment Videos

  • Stimulus duration was parametrically varied across experiments.
  • Control conditions were assessed to evaluate the appropriateness of experimental design.

    • Main Results:

    • No evidence was found for a proportionality between stimulus duration and the chronostasis effect.
    • The saccadic chronostasis effect remained constant across a wide range of stimulus durations.
    • Results suggest arousal is not critical, and timing onset mechanisms may be involved.

    Conclusions:

    • The findings challenge arousal-based internal clock speed models of saccadic chronostasis.
    • Saccadic chronostasis appears to be a constant effect, independent of stimulus duration.
    • Alternative timing mechanisms, specifically related to the onset of temporal judgment, are implicated and require further investigation.