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Adult cortical plasticity studied with chronically implanted electrode arrays.

Hiroshi Abe1, Justin N J McManus1, Nirmala Ramalingam1

  • 1The Rockefeller University, 1230 York Avenue, New York, New York 10065, and.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 13, 2015
PubMed
Summary
This summary is machine-generated.

Adult brain plasticity allows rapid recovery of visual function after injury. New research shows primary visual cortex (V1) receptive fields reorganize to restore vision, demonstrating significant cortical plasticity.

Keywords:
cortical plasticityexperience-dependent plasticityprimary visual cortexretinal lesionstopographic remapping

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Area of Science:

  • Neuroscience
  • Visual Cortex Research
  • Cortical Plasticity

Background:

  • The adult cerebral cortex exhibits experience-dependent plasticity.
  • Focal binocular lesions induce rapid changes in receptive fields (RFs) within the lesion projection zone (LPZ) of the primary visual cortex (V1).
  • Previous studies faced sampling bias concerns when investigating these dynamic changes.

Purpose of the Study:

  • To longitudinally investigate the dynamics of neural circuitry underlying receptive field reorganization after lesions in the primary visual cortex.
  • To overcome sampling bias limitations inherent in prior research methodologies.

Main Methods:

  • Implantation of microelectrode arrays in the primary visual cortex (V1) of macaque monkeys (Macaca mulatta).
  • Longitudinal recording of neural activity to track changes in receptive fields over time.
  • Controlled visual stimulation experiments, including the creation of artificial scotomas.

Main Results:

  • A rapid initial recovery of visual responses was observed in the lesion projection zone (LPZ).
  • Within weeks, 63-89% of LPZ sites regained visual responses with significant position tuning, with RFs shifting approximately 3° away from the scotoma.
  • Visual stimulation around artificial scotomas in naive subjects did not induce responses, supporting cortical reorganization as the mechanism for postlesion RF shifts.
  • Spikes, but not local field potentials (LFPs), reflected postlesion remapping, despite consistent prelesion tuning in both.

Conclusions:

  • The primary visual cortex (V1) demonstrates significant capacity for functional reorganization following injury.
  • Microelectrode array implantation provides a robust method for studying cortical plasticity dynamics without sampling bias.
  • The observed receptive field shifts are a result of cortical reorganization, highlighting the brain's adaptive capabilities in response to visual loss.