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Variability in neuronal activity in primate cortex during working memory tasks.

M Shafi1, Y Zhou, J Quintana

  • 1Neuropsychiatric Institute, 760 Westwood Plaza, School of Medicine, University of California, Los Angeles, CA 90095-1759, USA.

Neuroscience
|April 10, 2007
PubMed
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Working memory relies on neuronal activity, but this study reveals significant trial-to-trial firing variability in individual cells. This challenges the assumption of stable, replicable memory-cell activity in working memory models.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Computational Neuroscience

Background:

  • Persistent elevated neuronal activity is the established neural basis for working memory.
  • Current models assume stable and replicable memory-cell activity, potentially due to data averaging.

Purpose of the Study:

  • To experimentally verify the assumption of stable neuronal activity in working memory.
  • To characterize firing frequency trends and variability of cortical cells during working memory tasks.

Main Methods:

  • Developed a classification scheme for neuronal firing frequency trends.
  • Recorded and analyzed cellular activity from monkey cortex during working memory tasks.
  • Examined firing statistics and variability across individual trials and within trials.

Related Experiment Videos

Main Results:

  • Identified distinct statistics for cells across different firing-trend classes.
  • Observed substantial trial-to-trial variability in individual cell firing behavior.
  • Found significant variations in firing frequency within single trials and across trials.

Conclusions:

  • The assumption of stable, replicable memory-cell activity in working memory is challenged.
  • Neuronal firing in working memory exhibits greater variability than previously modeled.
  • Findings necessitate re-evaluation of current theories on cortical working memory mechanisms.