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Discovery
Exploring the Brain's Relationship to Habits

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photo of Ann Graybiel

Researcher Ann Graybiel studies how the human brain adapts to habits.

Credit: Bachrach Studios


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photo of a section from a human brain

Photomicrograph of a section from the human brain, stained for acetylcholinesterase, an enzyme that degrades neurotransmitter acetylcholine. This staining procedure revealed pockets of low enzyme activity, which appear dark in this light-dark reversed image. These are the histochemically identified striosomes.

Credit: Ann Graybiel


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