Cross-strata co-occurrence of ripples with theta-frequency oscillations in the hippocampus of foraging rats.

ABSTRACT: Brain rhythms have been postulated to play central roles in animal cognition. A prominently reported dichotomy of hippocampal rhythms links theta-frequency oscillations (4-12 Hz) and ripples (120-250 Hz) exclusively to preparatory and consummatory behaviours, respectively. However, because of the differential power expression of these two signals across hippocampal strata, such exclusivity requires validation through analyses of simultaneous multi-strata recordings. We assessed co-occurrence of theta-frequency oscillations with ripples in multi-channel recordings of extracellular potentials across hippocampal strata from foraging rats. We detected all ripple events from an identified stratum pyramidale (SP) channel. We then defined theta epochs based on theta oscillations detected from the

SUBMITTER: Seenivasan P 

PROVIDER: S-EPMC7615956 | biostudies-literature | 2024 May

REPOSITORIES: biostudies-literature