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A Method for Investigating Age-related Differences in the Functional Connectivity of Cognitive Control Networks Associated with Dimensional Change Card Sort Performance
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Alterations in resting functional connectivity due to recent motor task.

Kuang-Chi Tung1, Jinsoo Uh, Deng Mao

  • 1Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.

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|April 16, 2013
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Summary

Simple button presses in fMRI tasks can alter resting-state functional connectivity MRI (fcMRI) brain network activity. Researchers recommend performing fcMRI scans before or after a significant delay following task performance.

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Area of Science:

  • Neuroimaging
  • Cognitive Neuroscience
  • Functional MRI

Background:

  • Resting-state functional connectivity MRI (fcMRI) is crucial for understanding brain networks.
  • Task performance can potentially influence fcMRI results, impacting study design.
  • Simple motor tasks, like button presses, are common in fMRI experiments.

Purpose of the Study:

  • To investigate the impact of a simple button press task on subsequent resting-state fcMRI.
  • To determine if motor task performance affects brain connectivity and signal fluctuations.
  • To assess the duration of these task-induced effects on fcMRI.

Main Methods:

  • Human volunteers underwent a 23-minute button press motor task.
  • Resting-state brain activity was measured using fcMRI before and after the task.
  • Sham control studies were conducted to validate task-specific effects.

Main Results:

  • Post-task fcMRI showed significantly higher cross-correlation (CC) between motor cortices (p=0.002).
  • Amplitude of fcMRI signal fluctuation (AF) increased post-task.
  • Task-induced CC changes lasted ~5 minutes, AF changes lasted ~15 minutes.

Conclusions:

  • Simple button press tasks can elevate fcMRI CC and AF in brain networks.
  • These effects are specific to task performance, not just paradigm timing.
  • fcMRI scans should be timed carefully relative to evoked fMRI tasks.