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Related Experiment Videos

Memory orientation and success: separable neurocognitive components underlying episodic recognition.

Ian G Dobbins1, Heather J Rice, Anthony D Wagner

  • 1Martinos Center for Biomedical Imaging, MGH/MIT/HMS, Charlestown, MA 02129, USA. ian@nmr.mgh.harvard.edu

Neuropsychologia
|November 30, 2002
PubMed
Summary

Different brain networks support distinct memory retrieval strategies. Recollecting context involves the hippocampus, while recency judgments engage prefrontal and parietal areas, showing how memory orientations recruit separate neural populations.

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Episodic recognition relies on recalling contextual details or a sense of recent encounter.
  • Cognitive models suggest distinct retrieval orientations and neural responses for different memory aspects.
  • Understanding these differences is key to mapping memory retrieval processes.

Purpose of the Study:

  • To investigate neural differences between source recollection and recency judgments.
  • To determine if retrieval success modulates neural activity within distinct retrieval orientations.
  • To identify overlapping or dissimilar neural populations for orientation and success effects.

Main Methods:

  • Event-related functional magnetic resonance imaging (fMRI) was employed.
  • Subjects performed source recollection (associating words with encoding tasks) and recency judgments (identifying the most recent word).

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  • Neural activity was contrasted between retrieval orientations and between successful/unsuccessful trials.

    • Main Results:

    • Distinct lateral prefrontal and parietal activations differentiated source recollection from recency judgments.
    • These orientation effects were largely independent of retrieval success.
    • Medial temporal lobe structures, including the hippocampus, showed greater activity during successful source recollection, with reduced activity during failed recollection and recency judgments.

    Conclusions:

    • Different memory orientations recruit distinct prefrontal and parietal networks.
    • Episodic context recovery is specifically associated with the hippocampus and surrounding medial temporal cortices.
    • Neural mechanisms underlying memory retrieval are sensitive to the specific orientation of the search.