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Related Experiment Videos

Seeing and ballistic pointing at perisaccadic targets.

M Concetta Morrone1, Anna Ma-Wyatt, John Ross

  • 1Istituto di Neuroscience CNR Pisa, Università Vita-Salute S Raffele, Milan, Italy. concetta@in.cnr.it

Journal of Vision
|December 17, 2005
PubMed
Summary

Visual references are not essential for spatial compression during saccades. Conscious perception of space is compressed during eye movements, regardless of illumination or post-saccade visual cues.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • The visual system constructs spatial representations for perception and action.
  • Understanding how these representations are updated during rapid eye movements (saccades) is crucial.

Purpose of the Study:

  • To investigate the role of visual references and illumination levels on spatial localization during saccades.
  • To determine if post-saccadic visual information influences spatial compression.

Main Methods:

  • Participants localized briefly flashed stimuli presented near saccade onset.
  • A translucent shutter manipulated visual references and illumination at varying post-saccadic latencies.
  • Stimulus distances were verbally reported, and pointing tasks assessed spatial accuracy.

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Main Results:

  • Consistent compression of perceived stimulus distances occurred regardless of shutter latency or illumination.
  • Spatial compression was absent in blind pointing tasks unless visual references persisted post-saccade.
  • These findings indicate distinct spatial representations for perception and action.

Conclusions:

  • The visual system employs multiple spatial representations, weighted differently based on task and viewing conditions.
  • Conscious perception of space undergoes compression during saccades, irrespective of external visual cues.
  • Motor actions, like pointing, rely more heavily on sustained visual references for accurate spatial representation.