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Related Concept Videos

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Related Experiment Video

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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Processing of Egomotion-Consistent Optic Flow in the Rhesus Macaque Cortex.

Benoit R Cottereau1,2, Andrew T Smith3, Samy Rima1,2

  • 1Université de Toulouse, Centre de Recherche Cerveau et Cognition, Toulouse, France.

Cerebral Cortex (New York, N.Y. : 1991)
|January 22, 2017
PubMed
Summary

Researchers mapped the brain networks processing visual self-motion cues in macaques. They identified specific cortical areas, including the ventral intra-parietal area (VPS), sensitive to egomotion-consistent optic flow.

Keywords:
egomotionheadingmonkey fMRIoptic flowvision

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Primate Brain

Background:

  • The brain processes visual cues for self-motion perception.
  • Understanding the neural basis of optic flow processing is crucial for deciphering spatial navigation.

Purpose of the Study:

  • To characterize the cortical network processing visual cues for self-motion in awake, behaving macaques.
  • To distinguish between neurons responding to local flow and those sensitive to global self-motion cues.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used in 3 macaques.
  • The study contrasted responses to single versus multiple optic flow patches.
  • The experimental design mirrored previous human studies.

Main Results:

  • Significant selectivity for egomotion-consistent flow was observed in several cortical areas.
  • Key areas included dorsal middle superior temporal area, ventral intra-parietal area (VPS), and VPS.
  • Selectivity was particularly strong in VPS and a region homologous to human area CSv.

Conclusions:

  • The study identified specific brain regions involved in processing optic flow related to self-motion in macaques.
  • Findings reveal commonalities and differences compared to human studies on egomotion perception.
  • VPS and putative macaque CSv show strong selectivity for egomotion-compatible flow.