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Neocortical long-term potentiation

M F Bear1, A Kirkwood

  • 1Department of Neuroscience, Brown University, Providence, Rhode Island 02912.

Current Opinion in Neurobiology
|April 1, 1993
PubMed
Summary
This summary is machine-generated.

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Long-term potentiation (LTP) mechanisms in the neocortex are increasingly studied. Two distinct forms of neocortical LTP, one NMDA-receptor dependent and another independent, have been identified in layer III.

Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Cortical Function

Background:

  • Long-term potentiation (LTP) is a key mechanism of synaptic plasticity, primarily studied in the hippocampus.
  • Similar plasticity mechanisms are hypothesized to underlie neocortical function.
  • Investigating neocortical LTP is crucial for understanding brain plasticity beyond the hippocampus.

Purpose of the Study:

  • To investigate the forms of long-term potentiation (LTP) in layer III of the neocortex.
  • To determine if NMDA-receptor dependent and independent mechanisms of LTP exist in the neocortex.

Main Methods:

  • Electrophysiological recordings in the neocortex.
  • Pharmacological manipulation of NMDA receptors.
  • Assessment of voltage-sensitive calcium channels.

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Main Results:

  • Two distinct forms of LTP were identified in neocortical layer III.
  • One form of LTP is dependent on NMDA-receptor activation, similar to hippocampal LTP.
  • A second form of LTP is independent of NMDA receptors and relies on voltage-sensitive Ca2+ channels.

Conclusions:

  • Neocortical layer III exhibits at least two distinct forms of LTP.
  • These findings suggest diverse molecular mechanisms contribute to synaptic plasticity in the neocortex.
  • Understanding these mechanisms is vital for comprehending cognitive functions associated with the neocortex.