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Related Experiment Video

Updated: Sep 8, 2025

A Method for Investigating Age-related Differences in the Functional Connectivity of Cognitive Control Networks Associated with Dimensional Change Card Sort Performance
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Changes in brain activity and connectivity as memories age.

Francesco Gobbo1, Rufus Mitchell-Heggs1,2, Dorothy Tse3

  • 1Centre for Discover Brain Sciences, Deanery of Biomedical Sciences, University of Edinburgh, UK.

Cognitive Neuroscience
|June 13, 2022
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Summary

The hippocampus remains involved in memory consolidation over time, challenging theories of gradual independence. This neuroimaging study reveals changing brain connectivity patterns as memories age.

Keywords:
FMRIMemoryfunctional brain activityhuman neurosciencememory consolidation

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurobiology

Background:

  • The precise role of the hippocampus in memory consolidation remains debated, with conflicting evidence from human and animal studies.
  • Human lesion studies suggest a gradual hippocampal independence from memory over years, while animal models indicate a faster timescale (days).

Purpose of the Study:

  • To investigate the temporal dynamics of hippocampal activity and functional connectivity during memory consolidation using fMRI.
  • To reconcile conflicting findings regarding the hippocampus's involvement in memory over time.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to examine brain activity and connectivity.
  • Measurements were taken at four distinct time points after memory encoding in human participants.

Main Results:

  • A decrease in functional connectivity between the hippocampus and parahippocampal cortex was observed as memory age increased.
  • Despite decreased connectivity, the findings suggest continued hippocampal involvement in memory consolidation over extended periods.

Conclusions:

  • The study supports aspects of system consolidation theory by showing changes in hippocampal-cortical connectivity.
  • The results challenge the notion of a rapid or complete hippocampal independence from memory, suggesting a more nuanced role over time.