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Role of Prefrontal Persistent Activity in Working Memory.

Mitchell R Riley1, Christos Constantinidis1

  • 1Department of Neurobiology and Anatomy, Wake Forest School of Medicine Winston-Salem, NC, USA.

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Summary

Prefrontal cortex persistent activity is crucial for working memory, despite alternative theories. This neural activity is necessary and sufficient for maintaining information, particularly in the presence of distractors.

Keywords:
fMRImonkeyneuronneurophysiologyprefrontal cortex

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience

Background:

  • Working memory relies on neural activity, traditionally linked to persistent firing in the prefrontal cortex.
  • Recent findings challenge the role of persistent activity, suggesting other brain areas or dynamic patterns may be key.
  • Alternative theories propose the prefrontal cortex exerts top-down control rather than direct memory trace maintenance.

Purpose of the Study:

  • To review evidence supporting and refuting the role of prefrontal persistent activity in working memory.
  • To examine the neural correlates of working memory, focusing on visual neurophysiology.
  • To evaluate alternative working memory models and the contribution of other brain regions.

Main Methods:

  • Review of neurophysiological recordings and functional magnetic resonance imaging (fMRI) studies.
  • Analysis of persistent activity in the prefrontal cortex and its correlation with behavioral parameters.
  • Examination of information representation in various cortical areas during working memory tasks.

Main Results:

  • Prefrontal persistent activity accurately predicts behavioral performance in working memory tasks.
  • The prefrontal cortex represents non-spatial stimulus features, information often absent in early visual areas.
  • Alternative models without persistent activity explain only limited memory behaviors.
  • Other brain areas alone cannot sustain working memory, especially with distractors.

Conclusions:

  • Prefrontal persistent activity is both necessary and sufficient for working memory maintenance.
  • fMRI limitations in spatial resolution hinder decoding of fine-grained prefrontal cortex activity.
  • Persistent activity in the prefrontal cortex remains the most robust neural correlate for working memory.