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Prefrontal neuronal responses during audiovisual mnemonic processing.

Jaewon Hwang1, Lizabeth M Romanski2

  • 1Zanvyl Krieger Mind/Brain Institute, Johns Hopkins University, Baltimore, Maryland 21218 and.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 23, 2015
PubMed
Summary
This summary is machine-generated.

The ventrolateral prefrontal cortex (VLPFC) in macaques integrates auditory and visual communication signals in working memory. Some VLPFC neurons combine stored facial and vocal information, suggesting a role in multisensory mnemonic processing.

Keywords:
facesmacaquemonkeymultisensoryvocalizationworking memory

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Primate Research

Background:

  • Humans combine auditory and visual information during communication.
  • Single neurons in nonhuman primate ventrolateral prefrontal cortex (VLPFC) respond to simultaneous faces and vocalizations.
  • The role of VLPFC in maintaining and integrating communication stimuli in working memory is unknown.

Purpose of the Study:

  • To investigate whether VLPFC is involved in maintaining communication stimuli in working memory.
  • To determine if VLPFC combines stored information across auditory and visual modalities.
  • To explore the mnemonic processing of faces and vocalizations in VLPFC.

Main Methods:

  • Electrophysiological recordings from VLPFC in rhesus macaques (Macaca mulatta).
  • Performance of an audiovisual nonmatch-to-sample working memory task using dynamic movies of facial gestures and vocalizations.
  • Detection of changes in auditory, visual, or both components of the stimuli during the nonmatch period.

Main Results:

  • VLPFC neurons showed responses to stimulus and task factors, including sustained delay activity and match enhancement/suppression.
  • Some neurons detected component changes during the nonmatch period.
  • A subset of neurons combined auditory and visual information, responding to changes in both modalities.

Conclusions:

  • VLPFC is involved in both the perceptual and mnemonic processing of faces and vocalizations.
  • VLPFC neurons integrate and maintain audiovisual communication information in working memory.
  • These findings suggest a crucial role for VLPFC in multisensory communication and memory.