Definition of "striatum" [‖Stri•a•tum]

• The caudate nucleus and the lentiform nucleus considered as a single structure (noun)

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• "The second, involving the striatum, is called habit learning."
• "To look at this they looked at changes in gene expression in an area of the brain called the striatum, which is an area associated with the rewarding and reinforcing properties of drugs like cocaine."
• "Such ingrained habits appear to rely on a brain region called the striatum."