The signal reflects reward, physical salience, risk and punishment, in descending order of fractions of responding neurons.
Resultsĭopamine neurons show phasic activations to external stimuli.
The described experiments used standard behavioral and neurophysiological methods to record the activity of single dopamine neurons in awake monkeys during specific behavioral tasks. This review provides an updated overview about the basic signals of dopamine neurons to environmental stimuli. Previous lesion, electrical self-stimulation and drug addiction studies suggest that the midbrain dopamine systems are parts of the reward system of the brain.
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