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The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
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Related Experiment Video

Updated: Oct 23, 2025

Horizontal Hippocampal Slices of the Mouse Brain
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Parallel hippocampal-parietal circuits for self- and goal-oriented processing.

Annie Zheng1, David F Montez2, Scott Marek3

  • 1Department of Neurology, Washington University School of Medicine, St. Louis, MO 63110; azheng@wustl.edu ndosenbach@wustl.edu.

Proceedings of the National Academy of Sciences of the United States of America
|August 18, 2021
PubMed
Summary
This summary is machine-generated.

The hippocampus has distinct functional connections. Its anterior part links to the default mode network (DMN), while the posterior tail connects to the parietal memory network (PMN), supporting different cognitive functions.

Keywords:
brain networksfunctional connectivityhippocampusindividual variabilityresting state

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • The hippocampus is crucial for memory, navigation, and emotion.
  • Previous research suggests functional specialization within the hippocampus.
  • Understanding hippocampal functional connectivity aids in comprehending cognitive processes.

Purpose of the Study:

  • To investigate the functional connectivity of the hippocampus using resting-state fMRI.
  • To identify distinct functional networks associated with anterior and posterior hippocampal regions.
  • To explore the relationship between functional connectivity, task-related activity, and anatomical segmentation.

Main Methods:

  • Individual-specific precision functional mapping of resting-state fMRI data.
  • Analysis of functional connectivity between hippocampal subregions (anterior vs. posterior) and large-scale brain networks.
  • Comparison with task deactivation patterns and anatomical segmentation data.

Main Results:

  • The anterior hippocampus (head and body) showed preferential functional connectivity with the default mode network (DMN).
  • The posterior hippocampus (tail) demonstrated strong preferential functional connectivity with the parietal memory network (PMN).
  • This anterior-posterior functional dichotomy was supported by task deactivation patterns and anatomical data.

Conclusions:

  • The hippocampus exhibits functional dichotomization into anterior (DMN-connected) and posterior (PMN-connected) regions.
  • These distinct circuits support parallel but separate processing for self-referential and goal-oriented cognition.
  • Findings elucidate the specialized roles of hippocampal subregions in complex cognitive functions.