May 6, 2014

Visual areas exert feedforward and feedback influences through distinct frequency channels

BioRxiv : the Preprint Server for Biology
Andre M BastosPascal Fries

Abstract

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

  • References
  • Citations

References

  • We're still populating references for this paper, please check back later.
  • References
  • Citations

Citations

  • This paper may not have been cited yet.

Mentioned in this Paper

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

Related Feeds

BioRxiv & MedRxiv Preprints

BioRxiv and MedRxiv are the preprint servers for biology and health sciences respectively, operated by Cold Spring Harbor Laboratory. Here are the latest preprint articles (which are not peer-reviewed) from BioRxiv and MedRxiv.