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Related Experiment Video

Updated: Apr 20, 2026

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Dopamine neurons encode errors in predicting movement trigger occurrence.

Benjamin Pasquereau1, Robert S Turner2

  • 1Department of Neurobiology, Center for Neuroscience and The Center for the Neural Basis of Cognition, University of Pittsburgh, Pittsburgh, Pennsylvania.

Journal of Neurophysiology
|November 21, 2014
PubMed
Summary
This summary is machine-generated.

Dopamine neurons in the brain track time to predict event timing, signaling temporal prediction errors. This anticipation optimizes responses, independent of reward or movement details.

Keywords:
anticipationdopaminehazard rateprediction error

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Behavioral Neuroscience

Background:

  • Anticipating event timing is crucial for optimizing perception, attention, and response.
  • Neuronal mechanisms tracking time and estimating event likelihood (hazard rate) are key to anticipation.
  • Previous studies observed hazard-like activity in cortical areas, but the precise estimation mechanism remains unclear.

Purpose of the Study:

  • To investigate how dopamine neurons in the substantia nigra pars compacta (SNc) estimate time-dependent probabilities (hazard rate) for event anticipation.
  • To determine if dopamine neurons encode hazard-related prediction errors during a temporal anticipation task.
  • To examine the independence of these signals from reward or movement parameters.

Main Methods:

  • Recorded spiking activity of dopamine neurons in monkeys performing an arm-reaching task with a randomly varying foreperiod.
  • Analyzed reaction times in relation to foreperiod duration to assess behavioral anticipation of the 'go' signal.
  • Correlated neuronal firing rates with predicted hazard-related prediction errors.

Main Results:

  • Monkeys' reaction times decreased with longer foreperiods, indicating anticipation based on the hazard rate.
  • Dopamine neurons exhibited activity modulations consistent with hazard-related prediction errors: decreasing anticipatory activity (negative prediction error) and a phasic response to the 'go' signal (positive prediction error).
  • These neuronal signals were unaffected by reward magnitude, effort, or movement parameters.

Conclusions:

  • Dopamine neurons in the SNc encode hazard-related prediction errors, reflecting the brain's temporal estimation capabilities.
  • These neurons contribute to optimizing behavioral responses by signaling the likelihood of upcoming events.
  • The encoding of temporal prediction errors by dopamine neurons appears independent of reward and movement information.