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Representing the location of manipulable objects in shape-selective occipitotemporal cortex: Beyond retinotopic

Regine Zopf1, Marina Butko1, Alexandra Woolgar1

  • 1Perception in Action Research Centre & Department of Cognitive Science, Faculty of Human Sciences, Macquarie University, Sydney, Australia; ARC Centre of Excellence in Cognition and its Disorders, Macquarie University, Sydney, Australia.

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Summary

Brain scans show that the shape-selective occipitotemporal cortex does not encode object location in a body-centered (spatiotopic) reference frame, even for manipulable objects. Retinotopic encoding remains dominant for object location.

Keywords:
ActionManipulable objectsObject location encodingOccipitotemporal cortexVisual perceptionfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • The brain uses different reference frames to represent object locations relative to the body.
  • Spatiotopic reference frames, encoding location relative to the head or trunk, are found in action planning areas.
  • Debate exists regarding spatiotopic reference frames in higher-level visual areas like the occipitotemporal cortex.

Purpose of the Study:

  • To investigate object location encoding in the shape-selective occipitotemporal cortex using manipulable objects.
  • To determine if the occipitotemporal cortex uses spatiotopic reference frames for object location.
  • To test the hypothesis of spatiotopic encoding against the null hypothesis of no spatiotopic encoding.

Main Methods:

  • Multi-voxel pattern analysis (MVPA) functional magnetic resonance imaging (fMRI) study.
  • Utilized manipulable object stimuli (balls and cups).
  • Employed Bayesian analyses to assess statistical power and evidence for or against spatiotopic encoding.

Main Results:

  • Strong evidence confirmed retinotopic location encoding, consistent with prior research.
  • No evidence found for spatiotopic encoding of object location in the shape-selective occipitotemporal cortex for manipulable objects.
  • Exploratory analyses suggested potential modulation of retinotopic encoding by spatiotopic aspects.

Conclusions:

  • The shape-selective occipitotemporal cortex does not independently encode object location in a spatiotopic reference frame.
  • Retinotopic reference frames are the primary neural representation for object location in this visual cortex area.
  • Findings contribute to understanding how the brain represents object location and reference frames.