May 6, 2014

Visual areas exert feedforward and feedback influences through distinct frequency channels

BioRxiv : the Preprint Server for Biology
Andre M BastosPascal Fries


Visual cortical areas are thought to form a hierarchy and to subserve cognitive functions by interacting in both feedforward and feedback directions[1][1]. While feedforward influences convey sensory signals, feedback influences modulate brain responses to a given sensory stimulus according to the current behavioural context. Many studies have demonstrated effects of feedback influences on feedforward driven responses[2][2] and on behaviour[3][3]. Also, anatomical projections in both directions have been identified[1][1], [4][4]. However, although these studies have revealed the anatomical paths and the neurophysiological consequences of influences in both directions, the neurophysiological mechanisms through which these influences are exerted remain largely elusive. Here we show that in the primate visual system, feedforward influences are carried by theta-band (∼4 Hz) and gamma-band (∼60-80 Hz) synchronization, and feedback influences by beta-band (∼14-18 Hz) synchronization. These frequency-specific asymmetries in directed influences were revealed by simultaneous local field potential recordings from eight visual areas and an analysis of Granger-causal influences across all 28 pairs of areas. The asymmetries in directed infl...Continue Reading

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Mentioned in this Paper

Body Regions
Visual System
Positioning Attribute
Projections and Predictions
Anatomic Structures
Neurological System Process
Ion Channel

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