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Related Experiment Video

Updated: Jun 9, 2026

Correlating Behavioral Responses to fMRI Signals from Human Prefrontal Cortex: Examining Cognitive Processes Using Task Analysis
10:33

Correlating Behavioral Responses to fMRI Signals from Human Prefrontal Cortex: Examining Cognitive Processes Using Task Analysis

Published on: June 20, 2012

A neuronal basis for task-negative responses in the human brain.

Pan Lin1, Uri Hasson, Jorge Jovicich

  • 1Center for Mind/Brain Sciences, University of Trento, 38100 Mattarello, Italy.

Cerebral Cortex (New York, N.Y. : 1991)
|September 1, 2010
PubMed
Summary

The default mode network

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Area of Science:

  • Neuroimaging
  • Cognitive Neuroscience
  • Brain Function

Background:

  • The default mode network (DMN) shows reduced blood oxygenation-level-dependent (BOLD) signals during cognitive tasks compared to rest.
  • The underlying cause of these signal reductions in the DMN remains unclear, with possibilities including neuronal activity or physiological changes.

Purpose of the Study:

  • To investigate the source of BOLD signal decreases in the default mode network during demanding cognitive tasks.
  • To differentiate between neuronal and physiological contributions to task-related deactivation.

Main Methods:

  • Utilized the calibrated functional magnetic resonance imaging (fMRI) technique.
  • Quantified changes in cerebral blood flow (CBF) and cerebral metabolic rate of oxygen (CMRO₂) within DMN regions.
  • Analyzed the coupling between CBF and CMRO₂ during task performance.

Main Results:

  • Demonstrated a linear relationship between CBF and CMRO₂ in task-negative regions, similar to task-positive regions.
  • This coupling indicates a neuronal basis for signal reductions in the default mode network.
  • Identified two distinct modes of neuronal activity within the DMN, correlating with task effort levels.

Conclusions:

  • Signal decreases in the default mode network during cognitive tasks are primarily neuronal in origin.
  • The default mode network exhibits varied neuronal activity patterns related to cognitive effort.
  • This research clarifies the functional significance of default mode network deactivation.

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