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Visual activity in macaque area V4 depends on area 17 input.

P Girard1, P A Salin, J Bullier

  • 1INSERM U94, Bron, France.

Neuroreport
|February 1, 1991
PubMed
Summary

Area V4 visual responses are abolished when input from area 17 is inactivated. This demonstrates area 17’s critical role in V4 visual processing, even with alternative pathways.

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Area of Science:

  • Neuroscience
  • Visual Cortex Research
  • Primate Visual System

Background:

  • Area V4 in macaque monkeys receives direct retinal input from the lateral geniculate nucleus.
  • Visual information can reach area V4 bypassing area 17 via the superior colliculus and pulvinar.
  • The necessity of area 17 input for area V4 visual responsiveness remains unclear.

Purpose of the Study:

  • To investigate whether area V4 maintains visual responsiveness without input from area 17.
  • To determine the role of area 17 in the visual processing of area V4.

Main Methods:

  • Neuronal recordings were conducted in area V4 of macaque monkeys.
  • A specific region of area 17 was inactivated using cooling techniques.
  • Visual responses of V4 neurons were monitored during area 17 inactivation.

Main Results:

  • Inactivation of area 17 led to a complete loss of visual responses in most V4 neurons with receptive fields in the inactivated zone.
  • V4 neurons with receptive fields outside the inactivated area 17 region remained visually responsive.
  • This suggests area 17 is essential for V4 visual responses within its corresponding visual field representation.

Conclusions:

  • Area 17 plays a crucial role in mediating visual responses in area V4.
  • The findings highlight the hierarchical organization of the primate visual system.
  • Area V4's visual responsiveness is dependent on input from area 17, despite alternative visual pathways.

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