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Differential propagation of ripples along the proximodistal and septotemporal axes of dorsal CA1 of rats

Kumar, M and Deshmukh, SS (2020) Differential propagation of ripples along the proximodistal and septotemporal axes of dorsal CA1 of rats. In: Hippocampus, 30 (9). pp. 970-986.

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Official URL: https://dx.doi.org/10.1002/hipo.23211


The functional connectivity of the hippocampus with its primary cortical input, the entorhinal cortex, is organized topographically. In area CA1 of the hippocampus, this leads to different functional gradients along the proximodistal and septotemporal axes of spatial/sensory responsivity and spatial resolution respectively. CA1 ripples, a network phenomenon, allow us to test whether the hippocampal neural network shows corresponding gradients in functional connectivity along the two axes. We studied the occurrence and propagation of ripples across the entire proximodistal axis along with a comparable spatial range of the septotemporal axis of dorsal CA1. We observed that ripples could occur at any location, and their amplitudes were independent of the tetrode location along the proximodistal and septotemporal axes. When a ripple was detected on a particular tetrode (�reference tetrode�), however, the probability of cooccurrence of ripples and ripple amplitude observed on the other tetrodes decreased as a function of distance from the reference tetrode. This reduction was greater along the proximodistal axis than the septotemporal axis. Furthermore, we found that ripples propagate primarily along the proximodistal axis. Thus, over a spatial scale of �1.5 mm, the network is anisotropic along the two axes, complementing the topographically organized cortico-hippocampal connections. © 2020 Wiley Periodicals, Inc.

Item Type: Journal Article
Publication: Hippocampus
Publisher: John Wiley and Sons Inc.
Additional Information: Copyright to this article belongs to John Wiley and Sons Inc.
Department/Centre: Division of Biological Sciences > Centre for Neuroscience
Date Deposited: 06 Apr 2021 11:16
Last Modified: 06 Apr 2021 11:16
URI: http://eprints.iisc.ac.in/id/eprint/65529

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