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Related Experiment Video

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Modulating Cognition Using Transcranial Direct Current Stimulation of the Cerebellum
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Published on: February 15, 2015

Prefrontal control during a semantic decision task that involves idiom comprehension: a transcranial direct current

Tal Sela1, Richard B Ivry, Michal Lavidor

  • 1Department of Psychology, Bar Ilan University, Ramat Gan 52900, Israel.

Neuropsychologia
|June 13, 2012
PubMed
Summary

Transcranial direct current stimulation (tDCS) modulated prefrontal networks to enhance idiom comprehension. Cognitive control over semantic processing was influenced by motivation, particularly reward sensitivity.

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Published on: July 13, 2019

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Linguistics

Background:

  • Idiom comprehension involves complex cognitive operations like prediction and inhibition.
  • Prefrontal cognitive control networks are hypothesized to direct these decisions.
  • Motivational mechanisms may influence prefrontal control during language processing.

Purpose of the Study:

  • To investigate the role of prefrontal cognitive control networks in idiom comprehension using transcranial direct current stimulation (tDCS).
  • To test if motivational mechanisms bias prefrontal control during semantic decisions for idioms.
  • To examine how tDCS affects reaction times and decision-making accuracy for predictable and unpredictable idioms.

Main Methods:

  • Participants received either active or sham transcranial direct current stimulation (tDCS) over a one-week interval.
  • A semantic decision task assessed idiom-target word relatedness (figurative, literal, unrelated).
  • Idioms varied in predictability; participants completed motivation and control tasks.

Main Results:

  • Transcranial direct current stimulation (tDCS) generally slowed reaction times.
  • Left prefrontal enhancement improved performance on figurative targets of predictable idioms.
  • Right prefrontal enhancement improved performance on literal targets of unpredictable idioms.
  • These effects were stronger in individuals sensitive to reward likelihood.

Conclusions:

  • Prefrontal cognitive control networks are crucial for resolving semantic ambiguity in idioms.
  • Motivation, especially reward sensitivity, modulates cognitive control during language comprehension.
  • tDCS can selectively enhance neural networks supporting different aspects of idiom processing.