Cited by 4,564Neurotransmitter Receptor Influence on BehaviorNeural and Behavioral Psychology StudiesMemory and Neural Mechanisms

Predictive reward signal of dopamine neurons

Schultz, Wolfram·1998·Journal of Neurophysiology

Abstract

The effects of lesions, receptor blocking, electrical self-stimulation, and drugs of abuse suggest that midbrain dopamine systems are involved in processing reward information and learning approach behavior. Most dopamine neurons show phasic activations after primary liquid and food rewards and conditioned, reward-predicting visual and auditory stimuli. They show biphasic, activation-depression responses after stimuli that resemble reward-predicting stimuli or are novel or particularly salient. However, only few phasic activations follow aversive stimuli. Thus dopamine neurons label environmental stimuli with appetitive value, predict and detect rewards and signal alerting and motivating events. By failing to discriminate between different rewards, dopamine neurons appear to emit an alerting message about the surprising presence or absence of rewards. All responses to rewards and reward-predicting stimuli depend on event predictability. Dopamine neurons are activated by rewarding events that are better than predicted, remain uninfluenced by events that are as good as predicted, and are depressed by events that are worse than predicted. By signaling rewards according to a prediction error, dopamine responses have the formal characteristics of a teaching signal postulated by reinforcement learning theories. Dopamine responses transfer during learning from primary rewards to reward-predicting stimuli. This may contribute to neuronal mechanisms underlying the retrograde action of rewards, one of the main puzzles in reinforcement learning. The impulse response releases a short pulse of dopamine onto many dendrites, thus broadcasting a rather global reinforcement signal to postsynaptic neurons. This signal may improve approach behavior by providing advance reward information before the behavior occurs, and may contribute to learning by modifying synaptic transmission. The dopamine reward signal is supplemented by activity in neurons in striatum, frontal cortex, and amygdala, which process specific reward information but do not emit a global reward prediction error signal. A cooperation between the different reward signals may assure the use of specific rewards for selectively reinforcing behaviors. Among the other projection systems, noradrenaline neurons predominantly serve attentional mechanisms and nucleus basalis neurons code rewards heterogeneously. Cerebellar climbing fibers signal errors in motor performance or errors in the prediction of aversive events to cerebellar Purkinje cells. Most deficits following dopamine-depleting lesions are not easily explained by a defective reward signal but may reflect the absence of a general enabling function of tonic levels of extracellular dopamine. Thus dopamine systems may have two functions, the phasic transmission of reward information and the tonic enabling of postsynaptic neurons.

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Registry

Crossref · 10.1152/jn.1998.80.1.1

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  • Associative learning is predictive; only unanticipated events lead to learning, and greater difference between expected and actual reinforcement leads to greater differential learning success.

    “Moreover, AL is, according to all definitions, “predictive.” Because the CS (e.g., the sound of a buzzer) repeatedly precedes the US (e.g., the smell of food), it comes to “predict” the response (salivation). The extent to which the organism anticipates the reinforcement when the CS occurs influences the strength of learning. Only unanticipated events lead to learning. The greater the difference”
  • Previous literature suggests that dopaminergic neuron firing and dopamine release in the medial NAc core in response to novel sensory events habituates as the stimulus becomes familiar.

    “Previous literature suggests that dopaminergic neuron firing (Schultz, 1998) and dopamine release in the medial NAc core (Kutlu et al., 2022) in response to novel sensory events habituates as the stimulus becomes familiar.”
  • Changes in DAergic activity can signal punishment, aversion, or lack of expected reward, not only hedonic effects.

    “Although it was originally postulated that the DA released from the VTA only mediates the hedonic or pleasurable effects of natural reinforcers, it is now clear that changes in DAergic activity can also signal punishment, aversion, or lack of expected reward [53–58].”

    From Mechanistic insights into nicotine withdrawal (2011) · cites this paper as [53]

  • With repeated exposure, DA neurons stop firing when receiving food and instead fire to the stimulus predicting food delivery.

    “With repeated exposure, the DA neurons stop firing when receiving the food and fire instead when exposed to the stimulus that predicts food delivery (33).”

    From The Addictive Dimensionality of Obesity (2013) · cites this paper as [33]

  • These responses constitute biological implementations of the error term for reinforcement learning according to the Rescorla-Wagner model and temporal difference reinforcement models.

    “These responses constitute biological implementations of the crucial error term for reinforcement learning according to the Rescorla–Wagner model and temporal difference reinforcement models73; such a signal is appropriate for mediating learning and updating of reward predictions for approach behaviour and economic decisions4.”

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Authors
Schultz, W.
Affiliations
University of Fribourg (CH)
Corresponding author
Schultz, Wolfram
Venue
Journal of Neurophysiology
Published
1998-07-01
Volume
80
Issue
1
Pages
1-27
ISSN
  • 0022-3077 (ISSN-L)
  • 1522-1598
OpenAlex
W2109059823
Cited by
4,564
References
285
Citations by year
2026: 115 · 2025: 132 · 2024: 156 · 2023: 136 · 2022: 164 · 2021: 165 · 2020: 231 · 2019: 167 · 2018: 168 · 2017: 162 · 2016: 223 · 2015: 208 · 2014: 228 · 2013: 205 · 2012: 223
FWCI
20.56
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurophysiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
dopaminergic neurons, reward prediction error, midbrain dopamine system, reinforcement learning, approach behavior, tonic dopamine, norepinephrine, nucleus basalis of Meynert, climbing fibers, aversive stimuli
MeSH terms
Animals, Brain, Dopamine, Humans, Learning, Models, Neurological, Neurons, Reward, Signal Transduction

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