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MIT neuroscientists have identified tight connections between dopamine-producing cells of the substantia nigra (red) and neurons in the striatum (green). These connections, which show up as yellow, may play a role in the brain’s decision-making processes.  Image: Ann Graybiel, Jill CrittendenMIT neuroscientists have identified tight connections between dopamine-producing cells of the substantia nigra (red) and neurons in the striatum (green). These connections, which show up as yellow, may play a role in the brain’s decision-making processes. Image: Ann Graybiel, Jill CrittendenShare This Print This