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Multiple dopamine functions at different time courses.

Wolfram Schultz1

  • 1Department of Physiology, Development, and Neuroscience, University of Cambridge, Cambridge CB2 3DY, United Kingdom. ws234@cam.ac.uk

Annual Review of Neuroscience
|June 30, 2007
PubMed
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Midbrain dopamine neurons mediate organism reactivity to environmental stimuli across various timescales. Dopamine

Area of Science:

  • Neuroscience
  • Behavioral Science
  • Neurochemistry

Background:

  • Lesion studies reveal diverse behavioral deficits linked to midbrain dopamine neurons, yet a unified function remains elusive.
  • Electrophysiological and neurochemical studies offer conflicting accounts of dopamine's behavioral roles.
  • The vast range in the speed of observed phasic dopamine changes suggests differential behavioral involvements.

Purpose of the Study:

  • To reconcile conflicting findings on dopamine's role in behavior by considering the temporal dynamics of dopamine signaling.
  • To differentiate dopamine's behavioral relationships based on the time courses of its signaling.

Main Methods:

  • Analysis of existing lesion, electrophysiological, and neurochemical studies.
  • Correlation of behavioral deficits and functions with the varying time scales of dopamine signaling.

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Main Results:

  • Dopamine is implicated in mediating behavioral responses across a spectrum of time scales.
  • Fast dopamine changes are associated with reward processing.
  • Slower dopamine changes relate to uncertainty, punishment, movement, and the tonic enabling of motor, cognitive, and motivational systems.

Conclusions:

  • Dopamine's function is not monolithic but is differentiated by the temporal dynamics of its signaling.
  • This temporal framework helps explain diverse behavioral deficits observed in relation to dopamine.
  • Understanding these time-dependent roles is crucial for conditions like Parkinson's disease, where tonic dopamine signaling is impaired.