Cited by 232Neurotransmitter Receptor Influence on BehaviorStress Responses and CortisolNeuroscience and Neuropharmacology Research

Increased sensitivity to amphetamine and reward-related stimuli following social isolation in rats: possible disruption of dopamine-dependent mechanisms of the nucleus accumbens

Jones, G. H., Marsden, C. A., Robbins, T. W.·1990·Psychopharmacology

Abstract

These experiments compared isolation-reared and socially-reared rats in two complementary paradigms for measuring responding to signals of reward, both undrugged and following either systemic or intraaccumbens d-amphetamine (AMPH). In experiment 1, locomotor activity conditioned to food presentation was measured in rats exposed to a restricted feeding schedule. The interaction between this conditioned activity, AMPH administration (0.5, 2.0, 3.5, 5.0 mg/kg IP) and motivational state was measured. In experiment 2, hungry rats were trained to associate a compound light/noise stimulus with sucrose reward and were then implanted with guide cannulae in the nucleus accumbens. In the test phase, responding on one of two novel levers produced the compound stimulus (conditioned reinforcer; CR). Responses on the other lever had no effect. Each rat received four counterbalanced intra-accumbens infusions of AMPH (0, 3, 10, 20 micrograms). In both experiments, isolated rats responded more with stimuli associated with reward and this differential rearing effect was further exaggerated by AMPH. The isolation-induced sensitivity to these stimuli and to AMPH was critically dependent on motivational variables. Thus, in experiment 1 there were no differences between the groups when sated or during extinction and in experiment 2 the increased responding was restricted to the lever providing CR. Measurements of the locomotor response to intra-accumbens AMPH (0, 3, 10 micrograms) also revealed that isolated rats were more sensitive to a low dose of the drug when tested food-deprived in a relatively novel environment. These results suggest that the experience of isolation-rearing interacts either directly or indirectly with dopamine-dependent mechanisms of the nucleus accumbens to enhance the effects of reward-related stimuli.

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Crossref · 10.1007/bf02244105

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  • Social isolation increases indices of approach motivation, including enhanced responding for increasing sucrose concentrations and greater conditioned responses to sucrose-related stimuli.

    “Increased indices of approach motivation are also found following social isolation, with evidence of enhanced responding for increasing concentrations of sucrose (Cuenya et al., 2015; Hall et al., 1997), as well as greater conditioned responses to sucrose-related stimuli (Jones et al., 1990).”

    From The effects of early life stress on reward processing (2018) · cites this paper as Jones et al., 1990

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Authors
Jones, G. H., Marsden, C. A., & Robbins, T. W.
Affiliations
  • University of Cambridge (GB)
  • University of Nottingham (GB)
Venue
Psychopharmacology
Published
1990-11
Volume
102
Issue
3
Pages
364-372
ISSN
  • 0033-3158 (ISSN-L)
  • 1432-2072
OpenAlex
W2017838119
Cited by
232
References
61
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 4 · 2022: 1 · 2021: 4 · 2020: 1 · 2019: 5 · 2018: 6 · 2017: 5 · 2016: 6 · 2015: 11 · 2014: 4 · 2013: 8 · 2012: 7
FWCI
3.26
Type
journal article
Language
en
Open access
closed
Locations
  • Psychopharmacology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
social isolation, amphetamine sensitivity, nucleus accumbens, dopamine, reward, conditioned reinforcer, sucrose reward, food deprivation, locomotor activity, motivational states
MeSH terms
Animals, Conditioning, Operant, Dextroamphetamine, Dopamine, Dose-Response Relationship, Drug, Female, Injections, Motor Activity, Nucleus Accumbens, Reward, Social Isolation, Stereotaxic Techniques, Sucrose, Rats

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