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Spatial properties of non-retinotopic reference frames in human vision.

Babak Noory1, Michael H Herzog2, Haluk Ogmen3

  • 1Department of Electrical and Computer Engineering, University of Houston, Houston, TX, USA.

Vision Research
|June 7, 2015
PubMed
Summary

Visual perception uses dynamic, non-retinotopic reference frames that extend beyond stimuli. Their spatial properties are independent of element size, but dynamic frames interact, influenced by attention and proximity.

Keywords:
AttentionField effectMotion perceptionNon-retinotopicReference frame

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Area of Science:

  • Visual perception
  • Cognitive neuroscience
  • Psychophysics

Background:

  • Visual attributes are often processed using dynamic, non-retinotopic reference frames.
  • The linear motion of a larger object (e.g., a bicycle) can be discounted to perceive the relative motion of its components (e.g., a wheel reflector).
  • Mechanisms underlying the formation and function of these non-retinotopic reference frames are not well understood.

Purpose of the Study:

  • To investigate the spatial properties of non-retinotopic reference frames.
  • To understand how these frames extend in space and interact with each other.

Main Methods:

  • A variation of the Ternus-Pikler paradigm was employed.
  • Experiments examined the spatial extent of reference frames relative to inducing elements and target positions.
  • Interactions between dynamic and static reference frames were analyzed, as were interactions between neighboring dynamic frames.

Main Results:

  • Non-retinotopic reference frames extend beyond the boundaries of moving stimuli.
  • The spatial extent of these frames is independent of the size of inducing elements or target position.
  • Dynamic reference frames interact significantly, with interaction magnitude increasing as distance decreases.
  • Static reference frames do not influence dynamic ones.
  • Attention directed to neighboring frames attenuates the strength of the main reference frame.

Conclusions:

  • Non-retinotopic reference frames possess spatial properties and can extend over large areas.
  • These frames function and interact akin to fields, influenced by proximity and attentional focus.
  • Understanding these field-like properties is crucial for comprehending visual motion perception.