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Locally induced neuronal synchrony precisely propagates to specific cortical areas without rhythm distortion.

Abstract：

:Propagation of oscillatory spike firing activity at specific frequencies plays an important role in distributed cortical networks. However, there is limited evidence for how such frequency-specific signals are induced or how the signal spectra of the propagating signals are modulated during across-layer (radial) and inter-areal (tangential) neuronal interactions. To directly evaluate the direction specificity of spectral changes in a spiking cortical network, we selectively photostimulated infragranular excitatory neurons in the rat primary visual cortex (V1) at a supra-threshold level with various frequencies, and recorded local field potentials (LFPs) at the infragranular stimulation site, the cortical surface site immediately above the stimulation site in V1, and cortical surface sites outside V1. We found a significant reduction of LFP powers during radial propagation, especially at high-frequency stimulation conditions. Moreover, low-gamma-band dominant rhythms were transiently induced during radial propagation. Contrastingly, inter-areal LFP propagation, directed to specific cortical sites, accompanied no significant signal reduction nor gamma-band power induction. We propose an anisotropic mechanism for signal processing in the spiking cortical network, in which the neuronal rhythms are locally induced/modulated along the radial direction, and then propagate without distortion via intrinsic horizontal connections for spatiotemporally precise, inter-areal communication.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Toda H,Kawasaki K,Sato S,Horie M,Nakahara K,Bepari AK,Sawahata H,Suzuki T,Okado H,Takebayashi H,Hasegawa I

doi

10.1038/s41598-018-26054-8

subject

Has Abstract

pub_date

2018-05-16 00:00:00

pages

7678

issue

1

issn

2045-2322

pii

10.1038/s41598-018-26054-8

journal_volume

8

pub_type

杂志文章

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