Clarifying the role of higher-level cortices in resolving perceptual ambiguity using ultra high field fMRI

Research output: Contribution to journalArticlepeer-review

Abstract

The brain is organized into distinct, flexible networks. Within these networks, cognitive variables such as attention can modulate sensory representations in accordance with moment-to-moment behavioral requirements. These modulations can be studied by varying task demands; however, the tasks employed are often incongruent with the postulated functions of a sensory system, limiting the characterization of the system in relation to natural behaviors. Here we combine domain-specific task manipulations and ultra-high field fMRI to study the nature of top-down modulations. We exploited faces, a visual category underpinned by a complex cortical network, and instructed participants to perform either a stimulus-relevant/domain-specific or a stimulus-irrelevant task in the scanner. We found that 1. perceptual ambiguity (i.e. difficulty of achieving a stable percept) is encoded in top-down modulations from higher-level cortices; 2. the right inferior-temporal lobe is active under challenging conditions and uniquely encodes trial-by-trial variability in face perception.

Original languageEnglish (US)
Article number117654
JournalNeuroImage
Volume227
DOIs
StatePublished - Feb 15 2021

Bibliographical note

Funding Information:
Funding for this study was provided by National Institutes of Health Grants RF1 MH117015 (Ghose), RF1 MH116978 (Yacoub), P41 EB027061 (Ugurbil) and P30 NS076408 (Ugurbil). The authors would also like to thank Dr. Kendrick Kay for conceptual discussions regarding stimulus ambiguity and feedback.

Publisher Copyright:
© 2020

Keywords

  • Cognitive Neuroscience
  • Cortical Network
  • Perception
  • Task modulations
  • Top-down
  • Ultra High Field
  • Vision
  • fMRI

PubMed: MeSH publication types

  • Journal Article
  • Research Support, N.I.H., Extramural

Fingerprint

Dive into the research topics of 'Clarifying the role of higher-level cortices in resolving perceptual ambiguity using ultra high field fMRI'. Together they form a unique fingerprint.

Cite this