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Dr. Kevin McGrew

Get the latest news on Interactive metronome training, it's application and breakthroughs as well as insights in the science behind it and the latest tips and success stories from clients and therapist using IM and IM-Home.

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ADHD as a brain network dysfunction—IM as a tool to “fine tune” and control this network.

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ADHD as a brain network dysfunction—IM as a tool to “fine tune” and control this network.

The explosion of research on large scale brain networks, and the “resting state” or “default mode or default network” in particular, has been dizzying.  I previously reviewedkey brain network research describing the interaction between the default, salience (attention) and executive controlled networks.  The most important conclusion, which was reinforced by my personal experiencewith Interactive Metronome (IM), is that problems with controlled attention (focus) may be responsible for a number of the behavioral symptoms of ADHD—and this is due to the poor ability to suppress the random self-talk “background noise” of the default brain network.  [Click herefor related IM-HOME ADHD posts; click herefor ADHD- related Brain Clock.]


In prior posts I advanced the position that the efficacy of IM technology in improving focus or controlled attention is that it helps to "quiet the busy mind" due to the REST (random, episodic, spontaneous thought or thinking) of the default brain network. In simple terms, poor ability to suppress or quiet the default network results in poor controlled attention  when trying to engage in controlled, deliberate cognitive tasks.  The pirates of the default network are constantly engaged in “attentional capture” escapades—efforts to capture the brains gold—focus and controlled attention.

A new research review in Trends in Cognitive Sciences (January 2012, Vol. 16, No. 1) supports the hypothesis that ADHD may be a default brain network disorder. The authors state "In 2007, Sonuga-Barke and Castellanos suggested that ADHD could be considered a default network disorder"...and the authors of the current article agree. 

Individuals with ADHD may have trouble stopping (inhibiting) the spontaneous intrusion of default network generated random thoughts when engaged in tasks that require laser-beam focus on a cognitively demanding task (e.g., solving math problems; reading).  Either the default network does not function properly or is not synchronized well with other brain networks responsible for engaging controlled attention to shut down or inhibit the intrusion of thoughts generated by a busy mind.  A comprehensive review of the ADHD research in Neuropsychopharmacologyalso concluded that studies of the brain when it is at “rest” (default mode) reveal that one of the primary problems in ADHD “may lie in dysfunction of brain regions that, as discussed above, support a proposed 'default network'.  Specifically, it may be the case that an abnormally high default mode network activity may interfere with CFP attention network activity.”  CFP refers to cingulo-fronto-parietal activation.

I am not alone in my belief that a faulty default network, or a default network that is not well controlled by other cognitive control networks (sometimes referred to as poor network coherence), is important for understanding ADHD and other cognitive disorders.  Check out “The Brains Background Noise” and “Diagnosis by Default” for other reports along these lines.  Also, a very interesting studylinking the busyness of one’s wandering mind and working memory and attention fits nicely into this growing body of literature.

The ability to invoke “on-demand-focus”, to quiet the spontaneous internal self-talk and thinking we all enjoy when appropriate, is an important cognitive tool that can be trained.  Forms of meditationappear to operate along these lines.  As summarized in my prior posts, IM is a cognitive tool that can help individuals hone their ability to invoke on-demand-focus.  The attention-capturing pirates need to be kept at bay when the brain’s precious limited golden resource of attentional control (focus) is needed.

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Dr. Kevin McGrew is the Director of the Institute for Applied Psychometrics (IAP). He received a masters degree in school psychology at Moorhead State University and his doctoral degree in Educational Psychology at the University of Minnesota. He was a practicing school psychologist for 12 years. He spent 10 years as a Professor of Applied Psychology at St. Cloud State University. He is currently a Visiting Professor in Educational Psychology at the University of Minnesota. He serves as the Research and Science Director for Interactive Metronome.

Dr. McGrew conducts research in the areas of theories of human intelligence, intelligence testing, school learning, and the application of neurotechnology to cognitive performance and learning. He has published over 60 different journal articles, books or book chapters in his areas of expertise. He is a coauthor of the Woodcock-Johnson Battery III. Detailed information can be found at his the IAP web page. McGrew disseminates information regarding human intelligence and the human brain clock at two professional blogs (IQs Corner; Brain Clock Blog).

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