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Related Experiment Videos

A problem with Hebb and local spikes.

Jesse Goldberg1, Knut Holthoff, Rafael Yuste

  • 1Dept of Biological Sciences, Columbia University, 1212 Amsterdam Avenue, Box 2435, New York, NY 10027, USA. jhg24@columbia.edu

Trends in Neurosciences
|August 17, 2002
PubMed
Summary
This summary is machine-generated.

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Local spikes in dendrites may disrupt neuronal computation. Inverted Hebbian plasticity or homeostatic plasticity could maintain dendritic functional integrity by balancing synaptic weights.

Area of Science:

  • Neuroscience
  • Computational Neuroscience

Background:

  • Mammalian neuron cellular properties are increasingly understood, but dendritic tree computational functions remain unclear.
  • Pyramidal cells exhibit local dendritic excitation spikes, supporting Hebbian synaptic plasticity.
  • Hebbian plasticity relies on the precise timing of pre- and postsynaptic spikes.

Purpose of the Study:

  • To review the implications of local dendritic spikes for Hebbian plasticity.
  • To propose mechanisms that maintain dendritic functional integrity.

Main Methods:

  • Review of experimental findings on dendritic spikes and synaptic plasticity.
  • Theoretical analysis of plasticity mechanisms in complex dendritic trees.

Main Results:

Related Experiment Videos

  • Most dendritic spikes are local, not back-propagating action potentials.
  • Hebbian plasticity driven by local spikes may destabilize synaptic weight distribution.
  • Local spikes can undermine the functional integrity of complex dendritic trees.

Conclusions:

  • Inverted Hebbian plasticity of synapses involved in local spikes is proposed.
  • Local dendritic homeostatic plasticity may also prevent unbalanced synaptic weights.
  • These mechanisms could preserve the computational function of dendritic trees.