Key points

Dystonia happens when the brain’s inhibition fails, reminding us that restraint is as vital as action.

Functional movement disorders results from lack of agency; we can only change what we consciously recognize.

Like the brain’s feedback loops, growth in life requires continual sensing, adjusting, and learning.

Dr. Hallett’s legacy bridges science and humanity. Understanding how brain function help us to live better.

This week, I, along with so many others throughout the neuroscience and movement disorders community, was deeply saddened by the loss of Dr. Mark Hallett, a pioneer in understanding how the brain controls movement.

He led the Human Motor Control Section at the National Institutes of Health (NIH) for a distinguished career and transformed how we think about

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