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As the patients responded, researchers found activity in a surprising place: the putamen.

The key nodes of the network identified by the researchers were putamen, amygdala and claustrum located deep within the brain, and the connections between them.

Connections between the sensorimotor putamen and the anterior cingulate cortex, which is involved in emotion regulation, among other things, and is also implicated in habit learning, were weaker.

There is the putamen, which helps our limbs move.

With repetition of a task, brain activity moves into areas of the putamen and the basal ganglia, deep in what Wood calls “the rudimentary machinery of our minds.”