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Responses of midbrain dopamine neurons to behavioral trigger stimuli in the monkey
Abstract
Destruction of the midbrain dopamine (DA) system in Parkinsonian man and experimental animals leads to deficits in initiation of behavior, motor performance, and cognitive mechanisms. We have investigated the extracellular impulse activity of single midbrain DA neurons in unlesioned monkeys performing in a controlled behavioral task that was designed to paradigmatically test behavioral reactivity. Animals were trained to execute natural forelimb reaching movements for food reward in response to a trigger stimulus. Presumptive DA neurons were histologically located in the pars compacta of substantia nigra and in neighboring areas A8 and A10. They spontaneously discharged polyphasic impulses of relatively long duration (1.4-3.6 ms) and at low frequencies (0.5-8.5/s). Systemic injections of low doses of the DA autoreceptor agonist apomorphine (0.05-0.2 mg/kg) depressed the activity of virtually all thus tested DA neurons. In following established criteria, these characteristics strongly suggest the DAergic nature of the recorded neurons. The majority of midbrain DA neurons (70 of 128) responded to the behavioral trigger stimulus of the task with a short burst of impulses. Latencies ranged from 39 to 105 ms (median 65 ms) for onset and from 65 to 165 ms (median 95 ms) for peak of responses. Responses occurred before arm movement and at the time of or before onset of electromyographic (EMG) activity in prime mover muscles. Responses were time-locked to the stimulus and not to the onset of movement or EMG. Responses remained present in most neurons but were reduced when vision of the behavioral trigger stimulus was prevented while maintaining the associated acoustic signals. In another variation of the task, most neurons also responded to a stimulus that was physically identical to the behavioral trigger but to which the animal made no movement. The activity of a few DA neurons (11 of 128) was reduced following presentation of the behavioral trigger stimulus, with latencies comparable to those of activations. The activity of many DA neurons was increased (40 of 128) or reduced (22 of 128) during execution of the forelimb reaching movement. These changes were of a slow and moderate nature, and were minor compared with responses to the behavioral trigger stimulus. About half of movement-related neurons also responded to the behavioral trigger. The activity of a few DA neurons was increased (11 to 128) or reduced (1 to 128) when the food reward reached the mouth. These changes did not occur with spontaneous mouth movements. About half of these neurons also responded to the behavioral trigger.(ABSTRACT TRUNCATED AT 400 WORDS)
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“various subsets of dopamine neurons (1–44%) show slow, sluggish and diverse changes in the seconds time range that are inconsistently related to various aspects of behavioural task engagement and reactivity with stimulus-triggered or self-initiated arm or mouth movements11,12,14,18”
From Dopamine reward prediction-error signalling: A two-component response (2016) · cites this paper as [12]
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Dopamine Transporter Is a Master Regulator of Dopaminergic Neural Network Connectivity
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“Of particular interest are ventral tegmental area (VTA) DA cells, the firing rates of which change in response to the presentation of various reinforcers, including food (Ljungberg et al., 1992;Schultz, 1986).”
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Clarke-Williams, C. J., Lopes‐dos‐Santos, V., Lefèvre, L., Brizee, D., Causse, A. A., Rothaermel, R., Hartwich, K., Perestenko, P. V., Toth, R. A., McNamara, C. G., et al. (2024) · Cell · doi:10.1016/j.cell.2023.12.018 · Cited by 21
The role of value in the attentional boost effect
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“Food is considered a primary reward (Schultz, 1986), and pictures of food elicit activity in valuation and rewardrelated brain systems, such as the ventromedial prefrontal cortex (e.”
BackgroundFurther studies of the effects of intranigral morphine on behavioral responses to noxious stimuli
Baumeister, A. A., Nagy, M., Hebert, G., et al. (1990) · Brain Research · doi:10.1016/0006-8993(90)91326-c · Cited by 21
A mechanism for the involvement of colocalized neuropeptides in the actions of antipsychotic drugs
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“First, the condition induced by neuroleptics is nonphysiological, as other circumstances that engender rapid, bursty firing of dopamine neurons (for instance, certain behavioral paradigms) (Miller et al. 1981; Schultz 1986; Freeman and Bunney 1987), prefrontal cortex stimulation (Gariano and Groves 1987, 1988), or sub…”
BackgroundSingh, U., Kumar, S., Shelkar, G. P., Yadav, M., Kokare, D. M., Goswami, C., Lechan, R. M., & Singru, P. S. (2016) · Neuropharmacology · doi:10.1016/j.neuropharm.2016.04.012 · Cited by 20
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“Thus, the level of tonic GABAergic current level may regulate silencing and firing of dopamine neurons and this mechanism could contribute, for example, to pauses in dopamine neuron firing in response to reward omissions and aversive stimuli (Henny et al., 2012; Schultz, 1986; Ungless et al., 2004).”
BackgroundAssessment of recovery in the hemiparkinson rat: Drug-induced rotation is inadequate
Castañeda, E., FLEMING, S., Paquette, M. A., BOAT, K., MOFFETT, J., Stachowiak, E. K., Bloom, D. A., & Stachowiak, M. K. (2005) · Physiology & Behavior · doi:10.1016/j.physbeh.2005.01.019 · Cited by 20
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“…Neuroscience Societies and Blackwell Publishing Ltd electrophysiological evidence of similar changes in ventral tegmental area DA cell activity in response to food reward (Schultz, 1986; Nishino et al., 1987; Romo & Schultz, 1990; Schultz & Romo, 1990; Ljungberg et al., 1992; Schultz et al., 1993).”
BackgroundReward and value coding by dopamine neurons in non-human primates
Alikaya, A., Rack-Wildner, M., & Stauffer, W. R. (2017) · Journal of Neural Transmission · doi:10.1007/s00702-017-1793-9 · Cited by 20
“A partial survey of the literature that used apomorphine injections to identify dopamine neurons revealed that 77 of 85 putative dopamine neurons were suppressed by apomorphine, whereas none of 39 putative non-dopamine neurons were inhibited by apomorphine (Aebischer and Schultz 1984; Bunney et al. 1973; Guyenet and A…”
BackgroundInfluentialDopamine Mechanisms of Cocaine Addiction
Kiyatkin, E. A. (1994) · International Journal of Neuroscience · doi:10.3109/00207459408986048 · Cited by 19
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“…in monkey showed that dopamine (DA) neurons respond to stimulant environment ( 2008 Wong et al. 2006 ; ) and rat studies have shown that with repeated drug exposure, neural stimuli paired with the drug Schultz 1986 Ljungberg et al. 1992 (conditioned stimuli) start to increase DA by themselves ( ).”
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“Hence, these data are in agreement with numerous electrophysiological, dialysis and electrochemical observations, which show high reactiveness of mesolimbic DA cells and quick changes in nucleus accumbens extracellular DA concentrations with respect to various biologically significant stimuli (Trulson, 1985; Louilot e…”
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Natori, S., Yoshimi, K., Takahashi, T., Kagohashi, M., Oyama, G., Shimo, Y., Hattori, N., & Kitazawa, S. (2009) · Neuroscience Research · doi:10.1016/j.neures.2008.12.011 · Cited by 18
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Psychological and Neuroscientific Connections with Reinforcement Learning
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“Although VTA cells were extensively studied in vitro and anesthetized preparations (Chiodo, 1988; Grace and Bunney, 1984), data in awake conditions are limited and point at the high variability in their electrophysiological properties and important differences in their activity and responsiveness to sensory stimuli (D…”
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Self-citationNeurophysiology of Basal Ganglia
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BackgroundMolecular insights into the pathways underlying naked mole-rat eusocialityPreprint
Mulugeta, E., Marion‐Poll, L., Gentien, D., Ganswindt, S. B., Ganswindt, A., Bennett, N. C., Blackburn, E. H., Faulkes, C. G., & Heard, É. (2017) · bioRxiv (Cold Spring Harbor Laboratory) · doi:10.1101/209932 · Cited by 15
“Indeed, the dopaminergic pathway is a highly conserved system across vertebrates and some 434 invertebrates, with many important functions in the nervous system [81-86].”
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Dopamine and Glutamate Interactions in ADHD: Implications for the Future Neuropharmacology of ADHD
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“Projections from the VTA to the NA are identified as the meso‐ limbic pathway, or the “reward pathway,” because these dopamine projections are involved in rewarding behaviors, [7] firing when a reward is greater than expected or when a reward is anticipated [8-10].”
BackgroundWhat Role Does Striatal Dopamine Play in Goal-directed Action?
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Reward, Context, and Human Behaviour
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“However, the most relevant aspect of dopamine firing for the present discussion is the phasic response to the delivery of rewards and to stimuli that predict rewards, with a time course of only tens of milliseconds[15,16].”
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“Although there is no direct evidence for this mechanism, it should be noted that VTA DA cell activation has been seen in trained animals after presentation of food-related conditioned stimuli preceding the operant response for food, while subsequent food consumption was associated with the abrupt cessation of this act…”
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Responses of Monkey Dopamine Neurons to External Stimuli: Changes with Learning
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“Schultz and collaborators (e.g., Schultz 1986; Romo and Schultz 1990;”
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“4), a characteristic indicative of dopamine neurons (Bunney et al., 1973; Wang, 1981; Freeman et al., 1985; Schultz, 1986, 1998; Hyland et al., 2002; Pan & Hyland, 2005).”
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Neural reward processing under dopamine agonists: Imaging
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Forebrain dopamine value signals arise independently from midbrain dopamine cell firingPreprint
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Subsecond dopamine fluctuations do not specify the vigor of ongoing actions
Liu, H., Melani, R., Maltese, M., Taniguchi, J., Sankaramanchi, A., Zeng, R., Martin, J. R., & Tritsch, N. X. (2025) · Nature Neuroscience · doi:10.1038/s41593-025-02102-1 · Cited by 11
“Initial investigations suggested a permissive role, since few mDANs modulate their firing during skilled movements 4,5 , and DA receptor agonists alleviate motor impairments in PD, albeit incompletely 6,7 .”
The Pathological Paradigm of Neuroeconomics
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Hanßen, R., Schiweck, C., Aichholzer, M., Reif, A., & Thanarajah, S. E. (2022) · Current Opinion in Behavioral Sciences · doi:10.1016/j.cobeha.2022.101224 · Cited by 12
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“…the experiments presented here cannot easily reconcile these discrepant findings, it is important to note that unlike the well-described role of DA neuron firing in reward-related behaviors [104, 105–111], there is considerably less evidence for involvement of GABA neuron firing in such processes.”
ResultCalcium activity is a degraded estimate of spikes
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“In response to a new or reinforcing stimulus, these neurons generated trains of spikes with a latent period of about 100 msec [30].”
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Cerebellar learning using perturbationsPreprint
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“It is thought that the system learns to favour the actions that maximise the (discounted) reward, which is signalled by activity bursts in dopaminergic midbrain neurones and phasic release of dopamine, notably in the striatum itself (Schultz, 1986).”
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The complex regulation of dopamine output: A review of current themes
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“By enhancing the contrast in DA release when DA neuron activity switches from tonic to phasic firing in response to salient primary rewards or conditioned reward predictions [26], nicotine might enhance the reinforcement efficacy of any reward-related stimuli [24].”
BackgroundAdaptive Dopaminergic Neurons Report the Appetitive Value of Environmental Stimuli
Schultz, W. (1997) · Advances in psychology · doi:10.1016/s0166-4115(97)80103-3 · Cited by 7
Self-citationDopaminergic modulation of emotional memory in Parkinson’s disease
Hälbig, T. D., Kopp, U. A., Wodarz, F., Borod, J. C., Graciès, J., Ebersbach, G., & Kupsch, A. R. (2008) · Journal of Neural Transmission · doi:10.1007/s00702-008-0061-4 · Cited by 7
“Further, the observed negative effects of dopaminergic medication might at least partially depend on the type of dopaminergic medication: The physiological dopaminergic neurotransmission supporting cognitive and emotional processes is thought to be characterized by intermittent burst firing of dopaminergic neurons ( S…”
BackgroundGirard, B. (2003) · HAL · Cited by 7
Unveiling Dopamine and Met-Enkephalin Dynamics: Simultaneous Co-Detection in Rat Striatum
Berger, J. M., Todorov, J., Turner, K. M., McCarty, G. S., Romanova, E. V., Sweedler, J. V., & Sombers, L. A. (2025) · Analytical Chemistry · doi:10.1021/acs.analchem.5c03599 · Cited by 6
Dutta, C. N., Christov‐Moore, L., Ombao, H., & Douglas, P. K. (2022) · Frontiers in Human Neuroscience · doi:10.3389/fnhum.2022.938501 · Cited by 8
“Interest in dopamine as a mechanism for reward-based learning and motivation gained momentum through use of electrophysiological recordings and pharmacological manipulations of DA in animals (Olds and Milner, 1954; Wise, 1982; Schultz, 1986; Schultz et al., 1993; Viggiano et al., 2003, 2004).”
BackgroundInvolvement of cortical input to the rostromedial tegmental nucleus in aversion to foot shock
Glover, E. J., Starr, E. M., Gascon, A., Clayton-Stiglbauer, K., Amegashie, C. L., Selchick, A. H., Vaughan, D. T., Wayman, W. N., Woodward, J. J., & Chandler, L. J. (2023) · Neuropsychopharmacology · doi:10.1038/s41386-023-01612-5 · Cited by 8
Das menschliche Belohnungssystem
Erk, S., Walter, H., & Abler, B. (2005) · Nervenheilkunde · doi:10.1055/s-0038-1629956 · Cited by 6
“Bei Affen wurde mit Hilfe von Einzelzell-Ableitungen gezeigt, dass dopaminerge Neurone im Mittelhirn sowohl nach dem Erhalt einer Belohnung als auch nach visuellen und auditorischen Stimuli, die auf eine zukünftige Belohnung hinwiesen, verstärkt feuerten (50, 49, 34).”
BackgroundLoupe, P. S., Zhou, X., Davies, M. I., Schroeder, S. R., Tessel, R. E., & Lunte, S. M. (2002) · Pharmacology Biochemistry and Behavior · doi:10.1016/s0091-3057(02)00950-4 · Cited by 6
Alcohol Cues, Craving, and Relapse: Insights from Animal Models
Pina, M. M., & Williams, A. R. (2016) · InTech eBooks · doi:10.5772/63105 · Cited by 7
“Although VTA DA cells are initially activated by rewarding stimuli, this activation diminishes over time with repeated reward exposures and subsequent learning [112].”
BackgroundEvolution of in vivo dopamine monitoring techniques
Yocky, A. G., & Covey, D. P. (2020) · Pharmacology Biochemistry and Behavior · doi:10.1016/j.pbb.2020.173078 · Cited by 8
The effects of haloperidol on motor vigour and movement fusion during sequential reaching
Sporn, S., & Galea, J. M. (2025) · PLoS ONE · doi:10.1371/journal.pone.0316894 · Cited by 4
Choi, J.-W., Yang, S., & Kim, J. W. (2024) · Neuropsychiatric Disease and Treatment · doi:10.2147/ndt.s454881 · Cited by 6
“31 When unexpected rewards occur, dopamine neurons shaping the origin of the mesolimbic and mesocortical pathways are activated.”
BackgroundXu, S., Sun, Y., Huang, M., Huang, Y., Han, J., Tang, X., & Ren, W. (2021) · Frontiers in Psychology · doi:10.3389/fpsyg.2021.647263 · Cited by 6
“Previous studies showed that increased dopamine activities following unexpected presentation of food (Schultz, 1986) and successful escape from electric shock (Oleson et al., 2012; Wenzel et al., 2015) indicate, respectively, the role of dopamine in both reinforcement types.”
BackgroundMcGovern, R. A., Chan, A. K.-H., Mikell, C. B., Sheehy, J. P., Ferrera, V. P., & McKhann, G. M. (2015) · Physiological Reports · doi:10.14814/phy2.12422 · Cited by 5
“When a stimulus is conditioned to predict this reward, the phasic increase in neuronal firing rate shifts to occur reliably after stimulus presentation (Schultz 1986, 1998; Schultz et al. 1997).”
BackgroundMethodResultInfluentialLee, M. R., Shin, J. H., Deschaine, S. L., Daurio, A. M., Stangl, B. L., Yan, J., Ramchandani, V. A., Schwandt, M. L., Grodin, E. N., Momenan, R., et al. (2019) · The American Journal of Drug and Alcohol Abuse · doi:10.1080/00952990.2019.1638928 · Cited by 5
Kiyatkin, E. A., & Rebec, G. V. (1996) · Brain Research · doi:10.1016/0006-8993(95)01487-x · Cited by 5
Metadata
- Authors
- Schultz, W.
- Corresponding author
- Schultz, W.
- ORCID
- Schultz, W.
- Venue
- Journal of Neurophysiology
- Publisher
- American Physiological Society
- Published
- 1986-11-01
- Volume
- 56
- Issue
- 5
- Pages
- 1439-1461
- ISSN
- 0022-3077 (ISSN-L)
- 1522-1598
- OpenAlex
- W1831076810
- Cited by
- 390
- References
- 0
- Citations by year
- 2026: 4 · 2025: 9 · 2024: 10 · 2023: 8 · 2022: 9 · 2021: 8 · 2020: 12 · 2019: 14 · 2018: 15 · 2017: 18 · 2016: 15 · 2015: 14 · 2014: 8 · 2013: 12 · 2012: 8
- FWCI
- 1.96
- 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 › Motor Control and Adaptation
- Health Sciences › Medicine › Clinical Neurology › Parkinson's Disease Mechanisms and Treatments
- Keywords
- midbrain dopaminergic neurons, substantia nigra pars compacta, behavioral reactivity, apomorphine, dopamine autoreceptors, food reward, single-unit activity, Parkinson's disease, monkeys
- MeSH terms
- Animals, Conditioning, Psychological, Dopamine, Female, Macaca fascicularis, Mesencephalon, Neurons, Reward
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