Differential connectivity of perirhinal and parahippocampal cortices within human hippocampal subregions revealed by high-resolution functional imaging.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
Laura A LibbyCharan Ranganath

Abstract

Numerous studies support the importance of the perirhinal cortex (PRC) and parahippocampal cortex (PHC) in episodic memory. Theories of PRC and PHC function in humans have been informed by neuroanatomical studies of these regions obtained in animal tract-tracing studies, but knowledge of the connectivity of PHC and PRC in humans is limited. To address this issue, we used resting-state functional magnetic resonance imaging to compare the intrinsic functional connectivity profiles associated with the PRC and PHC both across the neocortex and within the subfields of the hippocampus. In Experiment 1, we acquired standard-resolution whole-brain resting-state fMRI data in 15 participants, and in Experiment 2, we acquired high-resolution resting-state fMRI data targeting the hippocampus in an independent sample of 15 participants. Experiment 1 revealed that PRC showed preferential connectivity with the anterior hippocampus, whereas PHC showed preferential connectivity with posterior hippocampus. Experiment 2 indicated that this anterior-posterior functional connectivity dissociation was more evident for subfields CA1 and subiculum than for a combined CA2/CA3/dentate gyrus region. Finally, whole-brain analyses from Experiment 1 reveale...Continue Reading

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Citations

May 29, 2013·Behavioural Brain Research·Wei-Chun WangCharan Ranganath
Jun 19, 2013·Behavioural Brain Research·Robert K Lech, Boris Suchan
Mar 8, 2013·Neuropsychologia·Deborah E HannulaCharan Ranganath
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Jan 26, 2016·Neurobiology of Learning and Memory·Shao-Fang WangCharan Ranganath
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Dec 21, 2014·Psychopharmacology·Brian Stollery, Leonie Christian
Jun 5, 2014·Schizophrenia Research·Wei-Chun WangJ Daniel Ragland

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