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The left prefrontal cortex supports inhibitory processing during semantic memory retrieval.

Martin Marko1, Igor Riečanský2

  • 1Department of Behavioural Neuroscience, Institute of Normal and Pathological Physiology, Centre of Experimental Medicine, Slovak Academy of Sciences, Bratislava, Slovakia; Department of Applied Informatics, Faculty of Mathematics, Physics and Informatics, Comenius University in Bratislava, Bratislava, Slovakia.

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|December 14, 2020
PubMed
Summary
This summary is machine-generated.

Anodal transcranial direct current stimulation (tDCS) over the left prefrontal cortex (PFC) enhances semantic inhibition, a key aspect of semantic control. This finding suggests the left PFC plays a crucial role in filtering semantic information.

Keywords:
Executive functionsPrefrontal cortexSemantic cognitionWorking memorytDCS

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • Semantic control involves neural mechanisms for processing and retrieving semantic information.
  • Neuroimaging suggests the left prefrontal cortex (PFC) is involved in controlled semantic processing, but its precise role is unclear.

Purpose of the Study:

  • To investigate the functional role of the left lateral PFC in semantic control.
  • To determine if left lateral PFC stimulation affects semantic inhibition, retrieval of habitual associates, or switching between retrieval rules.

Main Methods:

  • A double-blind randomized controlled experiment using anodal transcranial direct current stimulation (tDCS) over the left lateral PFC.
  • Participants performed automatic and controlled semantic retrieval tasks, alongside working memory and semantic judgment tasks.
  • Three groups received stimulation over left lateral PFC, temporoparietal cortex (control), or sham stimulation.

Main Results:

  • Anodal tDCS of the left lateral PFC significantly improved inhibition of prepotent semantic associations.
  • Left lateral PFC stimulation also enhanced working memory capacity, but this did not explain the semantic inhibition improvement.
  • Control tDCS over the temporoparietal cortex did not impact semantic retrieval.

Conclusions:

  • Semantic inhibition and switching are distinct components of the semantic control system.
  • The left lateral PFC is implicated in a filtering process, either proactively inhibiting semantic representations or reactively suppressing retrieved responses.
  • Understanding this inhibitory role could inform treatments for altered semantic processing.