Dynamic gamma frequency feedback coupling between higher and lower order visual cortices underlies perceptual completion in humans

Moratti, Stephan and Méndez Bértolo, Constantino and Pozo Guerrero, Francisco del and Strange, Bryan A. (2014). Dynamic gamma frequency feedback coupling between higher and lower order visual cortices underlies perceptual completion in humans. "NeuroImage", v. 86 ; pp. 470-479. ISSN 1053-8119. https://doi.org/10.1016/j.neuroimage.2013.10.037.

Description

Title: Dynamic gamma frequency feedback coupling between higher and lower order visual cortices underlies perceptual completion in humans
Author/s:
  • Moratti, Stephan
  • Méndez Bértolo, Constantino
  • Pozo Guerrero, Francisco del
  • Strange, Bryan A.
Item Type: Article
Título de Revista/Publicación: NeuroImage
Date: February 2014
ISSN: 1053-8119
Volume: 86
Subjects:
Freetext Keywords: Perceptual completion; Reverse hierarchical visual processing; Feedback; Gamma band activity; Dynamic causal models
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Tecnología Fotónica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

Full text

[img]
Preview
PDF - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (6MB)

Abstract

To perceive a coherent environment, incomplete or overlapping visual forms must be integrated into meaningful coherent percepts, a process referred to as ?Gestalt? formation or perceptual completion. Increasing evidence suggests that this process engages oscillatory neuronal activity in a distributed neuronal assembly. A separate line of evidence suggests that Gestalt formation requires top-down feedback from higher order brain regions to early visual cortex. Here we combine magnetoencephalography (MEG) and effective connectivity analysis in the frequency domain to specifically address the effective coupling between sources of oscillatory brain activity during Gestalt formation. We demonstrate that perceptual completion of two-tone ?Mooney? faces induces increased gamma frequency band power (55?71 Hz) in human early visual, fusiform and parietal cortices. Within this distributed neuronal assembly fusiform and parietal gamma oscillators are coupled by forward and backward connectivity during Mooney face perception, indicating reciprocal influences of gamma activity between these higher order visual brain regions. Critically, gamma band oscillations in early visual cortex are modulated by top-down feedback connectivity from both fusiform and parietal cortices. Thus, we provide a mechanistic account of Gestalt perception in which gamma oscillations in feature sensitive and spatial attention-relevant brain regions reciprocally drive one another and convey global stimulus aspects to local processing units at low levels of the sensory hierarchy by top-down feedback. Our data therefore support the notion of inverse hierarchical processing within the visual system underlying awareness of coherent percepts.

More information

Item ID: 26428
DC Identifier: http://oa.upm.es/26428/
OAI Identifier: oai:oa.upm.es:26428
DOI: 10.1016/j.neuroimage.2013.10.037
Official URL: http://www.sciencedirect.com/science/article/pii/S1053811913010604
Deposited by: Memoria Investigacion
Deposited on: 01 Jun 2014 07:34
Last Modified: 01 Mar 2015 23:56
  • Logo InvestigaM (UPM)
  • Logo GEOUP4
  • Logo Open Access
  • Open Access
  • Logo Sherpa/Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Logo Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Logo de Recolecta
  • Logo del Observatorio I+D+i UPM
  • Logo de OpenCourseWare UPM