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A preference for contralateral stimuli in human object- and face-selective cortex.

Christopher C Hemond1, Nancy G Kanwisher, Hans P Op de Beeck

  • 1McGovern Institute for Brain Research and Department of Brain & Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America.

Plos One
|June 28, 2007
PubMed
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High-level visual areas show a preference for contralateral stimuli, meaning information from one visual field is mainly processed in the opposite brain hemisphere. This positional sensitivity extends even to object and face recognition regions.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Visual information is primarily processed in the contralateral hemisphere.
  • Previous research focused on early visual processing, leaving high-level areas less understood regarding hemispheric specialization.

Purpose of the Study:

  • To investigate if the contralateral processing preference extends to high-level visual areas involved in object and face recognition.
  • To determine the extent of positional sensitivity in ventral visual cortex.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to scan human subjects.
  • Subjects viewed and attended to faces, objects, scenes, and scrambled images presented in either the left or right visual field.

Related Experiment Videos

Main Results:

  • Primary visual cortex showed a strong contralateral response.
  • Object- and face-selective regions exhibited a smaller, yet significant, contralateral preference.
  • The fusiform gyrus demonstrated the least pronounced contralateral preference, but it remained significant.

Conclusions:

  • Positional sensitivity is a fundamental characteristic of the visual system, present even in advanced ventral visual cortex.
  • Hemispheric specialization for visual field processing is maintained across different levels of visual hierarchy.