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The Multi-Source Interference Task: validation study with fMRI in individual subjects.

G Bush1, L M Shin, J Holmes

  • 1Department of Psychiatry, Harvard Medical School and Massachusetts General Hospital, Boston, USA. geo@nmr.mgh.harvard.edu

Molecular Psychiatry
|January 31, 2003
PubMed
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The Multi-Source Interference Task (MSIT) reliably activates the dorsal anterior cingulate cortex (dACC) in individuals using fMRI. This new task is crucial for studying cognitive processing and neuropsychiatric disorders.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • The dorsal anterior cingulate cortex (dACC) is vital for cognitive functions.
  • Previous neuroimaging studies required group-averaging for significant dACC activation.
  • Individualized dACC activation is needed for better neuropsychiatric disorder studies.

Purpose of the Study:

  • To develop a task that reliably activates the dACC in individuals.
  • To enhance functional magnetic resonance imaging (fMRI) studies of the dACC.
  • To improve the localization of dACC in healthy volunteers.

Main Methods:

  • The Multi-Source Interference Task (MSIT) was developed by combining cognitive interference sources.
  • Eight healthy adult volunteers performed the MSIT during fMRI.

Related Experiment Videos

  • fMRI responses and performance data were compared between interference and control trials.

    • Main Results:

    • Significant dACC activation (P < 1.7 x 10(-4)) was observed in all eight individuals and in group-averaged data.
    • Networked regions including dorsolateral prefrontal, premotor, and parietal cortices also showed activation.
    • The MSIT demonstrated a robust reaction time interference effect (312 +/- 61 ms), significantly larger than its components.

    Conclusions:

    • The MSIT reliably and robustly activates the dACC in individuals.
    • The task's stability and performance metrics are suitable for neuroimaging.
    • The MSIT is a valuable tool for investigating normal cognition and psychiatric pathophysiology.