The advantages of linear information processing for cerebellar computation

Joy T. Walter, Kamran Khodakhah

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

Purkinje cells can encode the strength of parallel fiber inputs in their firing by using 2 fundamentally different mechanisms, either as pauses or as linear increases in firing rate. It is not clear which of these 2 encoding mechanisms is used by the cerebellum. We used the pattern-recognition capacity of Purkinje cells based on the Marr-Albus-Ito theory of cerebellar learning to evaluate the suitability of the linear algorithm for cerebellar information processing. Here, we demonstrate the simplicity and versatility of pattern recognition in Purkinje cells linearly encoding the strength of parallel fiber inputs in their firing rate. In contrast to encoding patterns with pauses, Purkinje cells using the linear algorithm could recognize a large number of both synchronous and asynchronous input patterns in the presence or absence of inhibitory synaptic transmission. Under all conditions, the number of patterns recognized by Purkinje cells using the linear algorithm was greater than that achieved by encoding information in pauses. Linear encoding of information also allows neurons of deep cerebellar nuclei to use a simple averaging mechanism to significantly increase the computational capacity of the cerebellum. We propose that the virtues of the linear encoding mechanism make it well suited for cerebellar computation.

Original languageEnglish (US)
Pages (from-to)4471-4476
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume106
Issue number11
DOIs
StatePublished - Mar 17 2009

Keywords

  • Cerebellum
  • Motor learning
  • Purkinje cell

ASJC Scopus subject areas

  • General

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