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Prefrontal Cortex Networks Shift from External to Internal Modes during Learning.

Scott L Brincat1, Earl K Miller2

  • 1The Picower Institute for Learning and Memory and Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|September 16, 2016
PubMed
Summary
This summary is machine-generated.

During associative learning, the prefrontal cortex (PFC) shifts neural resources from processing external sensory information to internal memory recall. This brain region prioritizes internal processing as new knowledge is acquired.

Keywords:
bottom-uphippocampuslearningmemoryprefrontal cortextop-down

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Area of Science:

  • Neuroscience
  • Cognitive Science

Background:

  • Neural representations of environmental stimuli are enriched by acquired knowledge.
  • How network dynamics change with internal memory integration remains poorly understood.

Purpose of the Study:

  • To investigate how neural processing and network dynamics in the prefrontal cortex (PFC) and hippocampus (HPC) change during associative learning.
  • To determine if the PFC or HPC shifts resources from external to internal processing during learning.

Main Methods:

  • Simultaneous recording of spiking and local field potential activity from the PFC and HPC in monkeys.
  • Monkeys performed an object paired-associate learning task.

Main Results:

  • In the PFC, evoked potentials and neural information about external sensory stimuli decreased.
  • Induced beta-band oscillatory power and synchrony, associated with internal processing, increased in the PFC.
  • The HPC showed minimal learning-related changes in neural activity or network dynamics.

Conclusions:

  • PFC networks dynamically shift resources from external sensory processing to internal memory processing during associative learning.
  • The HPC does not appear to undergo similar dynamic resource shifts during this learning process.