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Related Experiment Videos

Prefrontal cortex and recognition memory. Functional-MRI evidence for context-dependent retrieval processes

A D Wagner1, J E Desmond, G H Glover

  • 1Department of Psychology, Stanford University, Palo Alto, USA. adwagner@nmr.mgh.harvard.edu

Brain : a Journal of Neurology
|November 3, 1998
PubMed
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Right prefrontal cortex activation during memory retrieval reflects retrieval attempt, not success. This activation pattern depends on retrieval context and strategy, reconciling previous study findings.

Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Psychology

Background:

  • Episodic recognition memory retrieval often shows activation in right prefrontal regions.
  • The precise function of this activation (success, effort, or attempt) remains debated.

Purpose of the Study:

  • To investigate the functional role of right prefrontal cortex activation during episodic recognition memory.
  • To determine if this activation reflects retrieval success, effort, or attempt.
  • To examine the influence of retrieval context on prefrontal activation patterns.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure prefrontal cortex activity.
  • Experiment 1 assessed activation across varying levels of recognition performance and effort.

Related Experiment Videos

  • Experiment 2 manipulated retrieval context by altering test instructions while keeping stimuli constant.

    • Main Results:

    • Right prefrontal activation patterns remained consistent across different levels of retrieval success and effort.
    • Activation patterns varied significantly when retrieval context (test instructions) was changed.
    • Similar activation magnitudes were observed across multiple performance levels, suggesting it's not critical for success.

    Conclusions:

    • Right prefrontal regions are primarily involved in retrieval attempt, which may include search initiation or attribute scrutiny.
    • The engagement of these regions is context-dependent, influenced by retrieval strategies adopted based on instructions.
    • Findings reconcile conflicting previous studies and suggest right prefrontal activation is not solely indicative of successful memory retrieval.