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Knowing what from where: Hippocampal connectivity with temporoparietal cortex at rest is linked to individual differences in semantic and topographic memory.

TitleKnowing what from where: Hippocampal connectivity with temporoparietal cortex at rest is linked to individual differences in semantic and topographic memory.
Publication TypeJournal Article
Year of Publication2017
AuthorsSormaz, M., Jefferies E., Bernhardt B. C., Karapanagiotidis T., Mollo G., Bernasconi N., Bernasconi A., Hartley T., & Smallwood J.
JournalNeuroimage
Volume152
Pagination400-410
Date Published2017 05 15
ISSN1095-9572
KeywordsAdult, Brain Mapping, Female, Hippocampus, Humans, Individuality, Magnetic Resonance Imaging, Male, Memory, Memory, Episodic, Neural Pathways, Parietal Lobe, Semantics, Temporal Lobe, Young Adult
Abstract

The hippocampus contributes to episodic, spatial and semantic aspects of memory, yet individual differences within and between these functions are not well-understood. In 136 healthy individuals, we investigated whether these differences reflect variation in the strength of connections between functionally-specialised segments of the hippocampus and diverse cortical regions that participate in different aspects of memory. Better topographical memory was associated with stronger connectivity between lingual gyrus and left anterior, rather than posterior, hippocampus. Better semantic memory was associated with increased connectivity between the intracalcarine/cuneus and left, rather than right, posterior hippocampus. Notably, we observed a double dissociation between semantic and topographical memory: better semantic memory was associated with stronger connectivity between left temporoparietal cortex and left anterior hippocampus, while better topographic memory was linked to stronger connectivity with right anterior hippocampus. Together these data support a division-of-labour account of hippocampal functioning: at the population level, differences in connectivity across the hippocampus reflect functional specialisation for different facets of memory, while variation in these connectivity patterns across individuals is associated with differences in the capacity to retrieve different types of information. In particular, within-hemisphere connectivity between hippocampus and left temporoparietal cortex supports conceptual processing at the expense of spatial ability.

DOI10.1016/j.neuroimage.2017.02.071
Alternate JournalNeuroimage
PubMed ID28246034
Grant ListBB/J006963/1 / / Biotechnology and Biological Sciences Research Council / United Kingdom

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