Synergistic activity between primary visual neurons.

Abstract:

:Cortical microcircuitry plays a pivotal role in encoding sensory information reaching the cortex. However, the fundamental knowledge concerning the mechanisms that govern feature-encoding by these sub-networks is still sparse. Here, we show through multi-electrode recordings in V1 of conventionally prepared anesthetized cats, that an avalanche of synergistic neural activity occurs between functionally connected neurons in a cell-assembly in response to the presented stimulus. The results specifically show that once the reference neuron spikes in a connected neuron-pair, it facilitates the response of its companion (target) neuron for 50ms and, thereafter, the excitability of the target neuron declines. On the other hand, the functionally unconnected neurons do not facilitate each other's activity within the 50-ms time-window. The added excitation (facilitation) of connected neurons is almost four times the responsiveness of unconnected neurons. This suggests that connectedness confers the added excitability to neurons; consequently leading to feature-encoding within the emergent 50-ms-period. Furthermore, the facilitation significantly decreases as a function of orientation selectivity spread.

journal_name

Neuroscience

journal_title

Neuroscience

authors

Bharmauria V,Bachatene L,Cattan S,Rouat J,Molotchnikoff S

doi

10.1016/j.neuroscience.2014.03.027

subject

Has Abstract

pub_date

2014-05-30 00:00:00

pages

255-64

eissn

0306-4522

issn

1873-7544

pii

S0306-4522(14)00240-1

journal_volume

268

pub_type

杂志文章