Cited by 272Functional Brain Connectivity StudiesNeural dynamics and brain functionNeural and Behavioral Psychology Studies

Spontaneous and Task-Evoked Brain Activity Negatively Interact

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He, Biyu J.·2013·The Journal of Neuroscience

Abstract

A widely held assumption is that spontaneous and task-evoked brain activity sum linearly, such that the recorded brain response in each single trial is the algebraic sum of the constantly changing ongoing activity and the stereotypical evoked activity. Using functional magnetic resonance imaging signals acquired from normal humans, we show that this assumption is invalid. Across widespread cortices, evoked activity interacts negatively with ongoing activity, such that higher prestimulus baseline results in less activation or more deactivation. As a consequence of this negative interaction, trial-to-trial variability of cortical activity decreases following stimulus onset. We further show that variability reduction follows overlapping but distinct spatial pattern from that of task-activation/deactivation and it contains behaviorally relevant information. These results favor an alternative perspective to the traditional dichotomous framework of ongoing and evoked activity. That is, to view the brain as a nonlinear dynamical system whose trajectory is tighter when performing a task. Further, incoming sensory stimuli modulate the brain's activity in a manner that depends on its initial state. We propose that across-trial variability may provide a new approach to brain mapping in the context of cognitive experiments.

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  1. Raichle ME 2006 Neuroscience. The brain’s dark energy Science 314 1249 1250 17124311
  2. Talairach J Tournoux P 1988 Co-Planar Stereotaxic Atlas of the Human Brain Stuttgart - New York Georg Thieme Verlag

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Authors
He, B. J.
Affiliations
National Institutes of Health (US)
Corresponding author
He, Biyu J.
Venue
The Journal of Neuroscience
Published
2013-03-13
Volume
33
Issue
11
Pages
4672-4682
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2040079144
Cited by
272
References
73
Citations by year
2026: 13 · 2025: 16 · 2024: 28 · 2023: 20 · 2022: 18 · 2021: 31 · 2020: 28 · 2019: 20 · 2018: 14 · 2017: 27 · 2016: 18 · 2015: 18 · 2014: 15 · 2013: 6
FWCI
10.38
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
Funders
National Institutes of Health (Z99 NS999999)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Functional Brain Connectivity Studies
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
Keywords
spontaneous brain activity, ongoing activity, trial-to-trial variability, cortical deactivation, nonlinear brain dynamics, brain mapping, functional MRI
MeSH terms
Adaptation, Physiological, Brain, Brain Mapping, Female, Humans, Image Processing, Computer-Assisted, Magnetic Resonance Imaging, Male, Oxygen, Psychomotor Performance, Reaction Time, Time Factors, Linear Models, Feedback, Physiological

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