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Foci of orientation plasticity in visual cortex.

V Dragoi1, C Rivadulla, M Sur

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Neurons in the cat visual cortex (V1) exhibit localized, short-term plasticity in orientation tuning. Pinwheel centers show significant adaptation, unlike surrounding areas, suggesting non-uniform cortical plasticity.

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Area of Science:

  • Neuroscience
  • Visual Cortex Plasticity
  • Cortical Microcircuits

Background:

  • Cortical areas are typically considered uniform in their plasticity.
  • Neurons in the visual cortex are organized into orientation-tuned domains and pinwheel centers.

Purpose of the Study:

  • To investigate the spatial uniformity of adaptation-induced plasticity in the cat striate cortex (V1).
  • To determine if neurons in different cortical domains (iso-orientation vs. pinwheel centers) exhibit differential plasticity.

Main Methods:

  • Electrophysiological recordings from cat V1 neurons.
  • Adaptation using oriented drifting grating stimuli.
  • Analysis of orientation tuning properties before and after adaptation.

Main Results:

  • Neurons at and near V1 pinwheel centers showed significant, adaptation-induced plasticity in orientation tuning.
  • Adaptation caused repulsive shifts in orientation preference and altered response magnitudes in pinwheel center neurons.
  • Neurons in iso-orientation domains exhibited minimal changes in tuning after adaptation.

Conclusions:

  • Cortical plasticity, specifically orientation tuning adaptation, is not uniform across V1.
  • Pinwheel centers represent foci of pronounced short-term plasticity, differing from iso-orientation domains.
  • Local intracortical interactions likely mediate the observed anisotropy in adaptation-induced plasticity.