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Related Experiment Videos

Perisaccadic mislocalization without saccadic eye movements.

F Ostendorf1, C Fischer, B Gaymard

  • 1Klinik für Neurologie, Charité, Schumannstr. 20/21, D-10117 Berlin, Germany. florian.ostendorf@charite.de

Neuroscience
|November 18, 2005
PubMed
Summary
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Visual perception remains stable despite eye movements. This study shows perisaccadic mislocalization, a visual distortion during saccades, can occur even without eye position signals, suggesting visual reference frames are key.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • The brain uses eye position signals to stabilize vision during saccadic gaze shifts.
  • Briefly flashed stimuli during saccades are mislocalized, showing spatial shifts and compression.
  • This perisaccadic mislocalization is often attributed to eye position signal timing errors.

Purpose of the Study:

  • To investigate perceptual mislocalization during actual saccades and simulated saccades.
  • To determine if mislocalization patterns differ when extraretinal eye position signals are absent.
  • To explore the role of visual reference frames in perisaccadic spatial distortions.

Main Methods:

  • Human observers performed saccadic eye movements.
  • Retinal image motion was simulated using a fast display shift during fixation.

Related Experiment Videos

  • Perceptual mislocalization (shift and compression) was measured in both conditions.

    • Main Results:

    • The spatial and temporal patterns of mislocalization were similar for real and simulated saccades.
    • Perisaccadic mislocalization occurred even without changes in extraretinal eye position signals.
    • Visual reference frame availability influenced the degree of shift and compression.

    Conclusions:

    • Perisaccadic mislocalization is not solely dependent on extraretinal eye position signals.
    • Difficulties in establishing a stable percept within a visual reference frame contribute to mislocalization.
    • Visual references play a significant role in modulating spatial distortions during rapid visual shifts.