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Related Experiment Videos

The human entorhinal cortex participates in associative memory

T Klingberg1, P E Roland, R Kawashima

  • 1Department of Neuroscience, Karolinska Institute, Stockholm, Sweden.

Neuroreport
|December 30, 1994
PubMed
Summary

Associative memory recall, unlike non-associative recall, activates the entorhinal cortex. This study highlights the entorhinal cortex

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Animal studies indicate parahippocampal cortex lesions impair visual stimulus-stimulus association learning.
  • The role of the human parahippocampal cortex in associative memory recall remains unclear.

Purpose of the Study:

  • To investigate whether recall of paired associates, compared to non-associated items, specifically activates the human parahippocampal cortex.
  • To elucidate the functional differences between the human hippocampal and parahippocampal cortex in memory recall.

Main Methods:

  • Positron emission tomography (PET) was used to measure regional cerebral blood flow in ten healthy volunteers.
  • Participants underwent scanning during non-associative recall and two conditions of visual associative recall.

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Main Results:

  • Associative recall, in contrast to non-associative recall, led to a specific increase in blood flow within the entorhinal cortex, extending into the presubiculum.
  • This finding suggests a distinct neural activation pattern for associative memory retrieval.

Conclusions:

  • The human entorhinal cortex is functionally engaged during associative memory recall.
  • The study demonstrates functional differentiation within the medial temporal lobe memory system, specifically between the hippocampus and parahippocampal cortex.