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Related Experiment Videos

Learning-induced plasticity in deep cerebellar nucleus.

Tatsuya Ohyama1, William L Nores, Javier F Medina

  • 1Keck Center for Neurobiology of Learning and Memory and Department of Neurobiology and Anatomy, University of Texas Medical School at Houston, Houston, Texas 77030, USA. tatsuya.ohyama@uth.tmc.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 8, 2006
PubMed
Summary

Cerebellar cortex lesions reveal that short-latency responses (SLRs) are mediated by plasticity in the anterior interpositus nucleus (AIN). This finding suggests cerebellar learning involves plasticity in nuclei downstream of the cortex.

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Area of Science:

  • Neuroscience
  • Cerebellar Learning
  • Associative Learning

Background:

  • Cerebellar learning involves multiple plasticity sites.
  • Pavlovian eyelid conditioning shows cerebellar cortex lesions abolish response timing but spare short-latency responses (SLRs).

Purpose of the Study:

  • To investigate the neural substrate of SLRs in cerebellar learning.
  • To determine if SLRs are mediated by plasticity in the anterior interpositus nucleus (AIN).

Main Methods:

  • Pharmacological inactivation and electrical microstimulation of sites afferent and efferent to the AIN.
  • Systematic elimination of alternative plasticity sites upstream and downstream of the AIN.

Main Results:

  • Evidence suggests SLRs are mediated by associative learning-induced plasticity in the AIN.

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  • This plasticity is downstream of the cerebellar cortex.

    • Conclusions:

    • Cerebellar learning is partly mediated by plasticity in target nuclei, such as the AIN.
    • SLRs serve as an index for plasticity in specific brain sites.