Phase‐amplitude coupling profiles differ in frontal and auditory cortices of bats

  • Neural oscillations are at the core of important computations in the mammalian brain. Interactions between oscillatory activities in different frequency bands, such as delta (1–4 Hz), theta (4–8 Hz) or gamma (>30 Hz), are a powerful mechanism for binding fundamentally distinct spatiotemporal scales of neural processing. Phase-amplitude coupling (PAC) is one such plausible and well-described interaction, but much is yet to be uncovered regarding how PAC dynamics contribute to sensory representations. In particular, although PAC appears to have a major role in audition, the characteristics of coupling profiles in sensory and integration (i.e. frontal) cortical areas remain obscure. Here, we address this question by studying PAC dynamics in the frontal-auditory field (FAF; an auditory area in the bat frontal cortex) and the auditory cortex (AC) of the bat Carollia perspicillata. By means of simultaneous electrophysiological recordings in frontal and auditory cortices examining local-field potentials (LFPs), we show that the amplitude of gamma-band activity couples with the phase of low-frequency LFPs in both structures. Our results demonstrate that the coupling in FAF occurs most prominently in delta/high-gamma frequencies (1-4/75-100 Hz), whereas in the AC the coupling is strongest in the delta-theta/low-gamma (2-8/25-55 Hz) range. We argue that distinct PAC profiles may represent different mechanisms for neuronal processing in frontal and auditory cortices, and might complement oscillatory interactions for sensory processing in the frontal-auditory cortex network.

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Author:Francisco García RosalesORCiDGND, Luciana López JuryORCiDGND, Eugenia González PalomaresORCiD, Yuranny Cabral-Calderı́nORCiD, Manfred KösslORCiD, Julio C. Hechavarria-CueriaORCiDGND
Parent Title (German):European Journal of Neuroscience
Place of publication:Oxford
Document Type:Article
Date of Publication (online):2020/09/26
Date of first Publication:2020/09/26
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2020/12/09
Tag:auditory cortex; cross-frequency coupling; delta oscillations; frontal cortex; gamma oscillations; local-field potentials; phase-amplitude coupling; theta oscillations
Page Number:19
Institutes:Biowissenschaften / Biowissenschaften
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie
5 Naturwissenschaften und Mathematik / 59 Tiere (Zoologie) / 590 Tiere (Zoologie)
Licence (German):License LogoCreative Commons - Namensnennung 4.0