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Related Experiment Video

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Combining Transcranial Magnetic Stimulation and fMRI to Examine the Default Mode Network

Combining Transcranial Magnetic Stimulation and fMRI to Examine the Default Mode Network

Published on: December 28, 2010

Modafinil modulation of the default mode network.

Michael J Minzenberg¹, Jong H Yoon, Cameron S Carter

¹Department of Psychiatry, University of California, Davis School of Medicine, Sacramento, CA, USA. michael.minzenberg@ucdmc.ucdavis.edu

Psychopharmacology

|December 15, 2010

Summary

This summary is machine-generated.

Modafinil enhances activity in the default mode network (DMN) during a sensorimotor task. This effect in key brain regions like the vmPFC is linked to faster reaction times, suggesting a role in cognitive processing.

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Area of Science:

Neuroscience
Cognitive Neuroscience
Pharmacology

Background:

The default mode network (DMN) is crucial for various cognitive functions.
Key hubs of the DMN include the vmPFC, PCC/rSpl, and IPL.
Neurochemical modulation of the DMN remains poorly understood.

Purpose of the Study:

To investigate the effect of modafinil, a norepinephrine/dopamine transporter inhibitor, on the DMN.
To test the hypothesis that modafinil modulates DMN activity.

Main Methods:

Eighteen healthy adults underwent a double-blind, placebo-controlled study.
A single oral dose of 200 mg modafinil was administered.
Functional MRI (fMRI) was used during a visual sensorimotor task to assess task-induced deactivation (TID) within the DMN.

Main Results:

Modafinil showed a trend towards faster reaction times (RT).
Significant augmentation of TID by modafinil was observed in vmPFC, PCC/rSpl, and left IPL.
The modafinil-induced increase in TID within the vmPFC correlated with RT improvements.

Conclusions:

Modafinil augments TID in the DMN, enhancing sensorimotor processing speed.
This effect appears dependent on vmPFC activity modulation.
Findings align with the catecholamine system's gain control function and modafinil's pro-cognitive effects.