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Cerebellar mechanisms in eyeblink conditioning.

Philip J E Attwell1, Magnus Ivarsson, Laurie Millar

  • 1Department of Anatomy and Developmental Biology, University College London, London WC1E 6BT, United Kingdom.

Annals of the New York Academy of Sciences
|February 13, 2003
PubMed
Summary

Cerebellar cortex and nuclei are essential for eyeblink conditioning. Blocking neurotransmission in these areas abolishes conditioned responses (CRs), indicating a fully functional loop is required for learning.

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Area of Science:

  • Neuroscience
  • Cerebellar Learning
  • Behavioral Plasticity

Background:

  • A model proposes cerebellar cortex and nuclei plasticity for timing and movement control in eyeblink conditioning.
  • Previous studies show lesions disrupt response timing, suggesting roles for these areas.

Purpose of the Study:

  • To investigate the roles of cerebellar cortex and nuclei in eyeblink and nictitating membrane conditioned responses (CRs).
  • To characterize potential cortical and nuclear plasticity mechanisms using pharmacological agents.

Main Methods:

  • Administered AMPA and GABA-A receptor antagonists (CNQX, picrotoxin, SR95531) to cerebellar cortex (lobule HVI) and nuclei.
  • Analyzed effects on conditioned response (CR) frequency and latency in nictitating membrane and eyeblink conditioning.

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Main Results:

  • Blocking excitatory or inhibitory inputs to the cerebellar cortex abolished CRs.
  • Blocking GABA-A receptors in the cerebellar nuclei also abolished CRs.
  • Blocking AMPA/kainate receptors in the nuclei did not affect CR frequency or latency, and CR latencies were never shortened.

Conclusions:

  • Normal function of both cerebellar cortex and nuclei is necessary for performing eyeblink and nictitating membrane CRs.
  • Evidence does not support AMPA/kainate receptor-mediated transmission from mossy fibers to cerebellar nuclei as an essential mechanism for eyeblink conditioning.
  • A functional olivo-cortico-nuclear loop is crucial for expressing all features of associatively conditioned responses.