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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.

The claustrum helps to regulate concentration, but its exact role remains unknown.

The resemblance indicated that reptiles, too, had a claustrum.

This result argues that claustrum activity plays a critical role in generating parkinsonian movement.

But  these claustrum neurons seem to connect to most or all of the outer parts of the brain that take in sensory information and drive behaviour.