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Spatial memory encoding is associated with the anterior and posterior hippocampus: An fMRI activation likelihood
Madeline A Sullivan1, Haley A Fritch2, Scott D Slotnick1
1Department of Psychology and Neuroscience, Boston College, Chestnut Hill, Massachusetts, USA.
Hippocampus
|August 16, 2024
Summary
Spatial memory encoding and retrieval involve both anterior and posterior hippocampus regions. This finding challenges strict hypotheses about localized hippocampal functions for memory tasks.
Area of Science:
- Neuroscience
- Cognitive Psychology
Background:
- The hippocampus is crucial for memory, with hypotheses suggesting functional specialization along its anterior-posterior axis.
- Specific roles for anterior vs. posterior hippocampus in spatial memory encoding and retrieval remain debated.
Purpose of the Study:
- To investigate the longitudinal functional organization of the hippocampus during spatial memory.
- To differentiate between the spatial-posterior and encoding-retrieval hypotheses of hippocampal function.
Main Methods:
- A coordinate-based fMRI activation likelihood estimation (ALE) meta-analysis was performed.
- Analyzed 26 studies (435 participants) reporting hippocampal activity during spatial memory encoding and/or retrieval.
Main Results:
- Both spatial memory encoding and retrieval engaged widespread hippocampal and surrounding cortical areas.
- Direct contrast revealed distinct activations in both anterior and posterior hippocampus for encoding versus retrieval.
- Spatial memory encoding activated both anterior and posterior hippocampus.
Conclusions:
- Strict forms of the spatial-posterior and encoding-retrieval hypotheses are not supported.
- Spatial memory encoding involves both anterior and posterior hippocampal regions.
- The hippocampus exhibits distributed processing for spatial memory functions.
