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The effective connectivity of the human hippocampal memory system
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Rolls, Edmund T., Deco, Gustavo, Huang, Chu-Chung and Feng, Jianfeng (2022) The effective connectivity of the human hippocampal memory system. Cerebral Cortex, 32 (17). pp. 3706-3725. doi:10.1093/cercor/bhab442 ISSN 1047-3211.
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Official URL: http://dx.doi.org/10.1093/cercor/bhab442
Abstract
Effective connectivity measurements in the human hippocampal memory system based on the resting-state blood oxygenation-level dependent signal were made in 172 participants in the Human Connectome Project to reveal the directionality and strength of the connectivity. A ventral “what” hippocampal stream involves the temporal lobe cortex, perirhinal and parahippocampal TF cortex, and entorhinal cortex. A dorsal “where” hippocampal stream connects parietal cortex with posterior and retrosplenial cingulate cortex, and with parahippocampal TH cortex, which, in turn, project to the presubiculum, which connects to the hippocampus. A third stream involves the orbitofrontal and ventromedial-prefrontal cortex with effective connectivity with the hippocampal, entorhinal, and perirhinal cortex. There is generally stronger forward connectivity to the hippocampus than backward. Thus separate “what,” “where,” and “reward” streams can converge in the hippocampus, from which back projections return to the sources. However, unlike the simple dual stream hippocampal model, there is a third stream related to reward value; there is some cross-connectivity between these systems before the hippocampus is reached; and the hippocampus has some effective connectivity with earlier stages of processing than the entorhinal cortex and presubiculum. These findings complement diffusion tractography and provide a foundation for new concepts on the operation of the human hippocampal memory system.
Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||||||||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Computer Science | ||||||||||||||||||||||||||||||||||||||||||||||||
Journal or Publication Title: | Cerebral Cortex | ||||||||||||||||||||||||||||||||||||||||||||||||
Publisher: | Oxford University Press | ||||||||||||||||||||||||||||||||||||||||||||||||
ISSN: | 1047-3211 | ||||||||||||||||||||||||||||||||||||||||||||||||
Official Date: | 1 September 2022 | ||||||||||||||||||||||||||||||||||||||||||||||||
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Volume: | 32 | ||||||||||||||||||||||||||||||||||||||||||||||||
Number: | 17 | ||||||||||||||||||||||||||||||||||||||||||||||||
Page Range: | pp. 3706-3725 | ||||||||||||||||||||||||||||||||||||||||||||||||
DOI: | 10.1093/cercor/bhab442 | ||||||||||||||||||||||||||||||||||||||||||||||||
Status: | Peer Reviewed | ||||||||||||||||||||||||||||||||||||||||||||||||
Publication Status: | Published | ||||||||||||||||||||||||||||||||||||||||||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||||||||||||||||||||||||||
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