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A Cognitive Paradigm to Investigate Interference in Working Memory by Distractions and Interruptions
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A critical component that activates the left inferior prefrontal cortex during interference resolution.

Koji Jimura1, Ken-ichiro Yamashita, Junichi Chikazoe

  • 1Department of Physiology, The University of Tokyo School of Medicine, Tokyo, Japan.

The European Journal of Neuroscience
|May 29, 2009
PubMed
Summary

This study reveals the left inferior frontal gyrus (IFG) inhibits proactive interference (PI) itself, not just inappropriate responses. This brain region

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Human Brain Function

Background:

  • Proactive interference (PI) impacts working memory and item recognition.
  • The left inferior frontal gyrus (IFG) is implicated in resolving PI.
  • It remains unclear if IFG resolves PI by inhibiting response tendencies or PI itself.

Purpose of the Study:

  • To investigate whether the left IFG inhibits inappropriate response tendencies or PI per se.
  • To dissociate the specific role of IFG in PI resolution using a novel paradigm.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed.
  • A recency judgment paradigm with three trial types (congruent PI, incongruent PI, no PI) was used.
  • Brain activation patterns were analyzed in relation to PI influence.

Main Results:

  • Left IFG activation was observed during PI resolution in incongruent PI trials compared to no PI trials.
  • IFG activation correlated with the inhibition of PI itself (congruent PI vs. no PI trials).
  • IFG activation was not related to the inhibition of inappropriate response tendencies (incongruent PI vs. congruent PI trials).

Conclusions:

  • The left IFG plays a crucial role in inhibiting proactive interference per se.
  • IFG's control function in PI resolution is independent of response congruence.
  • This finding clarifies the specific mechanism of IFG involvement in cognitive control and memory.