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Related Experiment Videos

Active hippocampus during nonconscious memories.

Katharina Henke1, Valerie Treyer, Eva Turi Nagy

  • 1Division of Psychiatry Research, Psychiatric University Hospital, University of Zürich, Lenggstrasse 31, 8029 Zürich, Switzerland. Henke@bli.unizh.ch

Consciousness and Cognition
|March 6, 2003
PubMed
Summary

The hippocampal formation plays a role in both conscious and nonconscious memory. Neuroimaging reveals its involvement in retrieving unconsciously acquired information, suggesting similar functions for conscious and nonconscious memory.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • The hippocampal formation is crucial for conscious, declarative memory.
  • Its role in nonconscious memory processes is less understood.

Purpose of the Study:

  • To investigate the hippocampal formation's role in nonconscious memory using neuroimaging.
  • To explore whether conceptual knowledge acquired during nonconscious processing can be retrieved.

Main Methods:

  • Masked presentation of faces paired with professions to subjects unaware of the stimuli.
  • fMRI neuroimaging during nonconscious retrieval tasks involving previously masked stimuli.
  • Comparison of brain activation patterns for masked versus new faces.

Main Results:

  • Masked presentations activated brain regions similar to unmasked stimuli.

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  • Retrieval of nonconsciously acquired information (faces and professions) activated the hippocampal formation, perirhinal cortex, fusiform, and fronto-temporal areas.
  • These activations suggest nonconscious retrieval within the semantic processing system.

    • Conclusions:

    • The hippocampal formation is involved in nonconscious memory retrieval.
    • Data suggest an analogous function of the hippocampus in both conscious and nonconscious memory.
    • Conceptual knowledge acquired nonconsciously can be retrieved, implicating the hippocampus in this process.