Motivational systems in adolescence: Possible implications for age differences in substance abuse and other risk-taking behaviors
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Adolescence is an evolutionarily conserved developmental phase characterized by hormonal, physiological, neural and behavioral alterations evident widely across mammalian species. For instance, adolescent rats, like their human counterparts, exhibit elevations in peer-directed social interactions, risk-taking/novelty seeking and drug and alcohol use relative to adults, along with notable changes in motivational and reward-related brain regions. After reviewing these topics, the present paper discusses conditioned preference and aversion data showing adolescents to be more sensitive than adults to positive rewarding properties of various drugs and natural stimuli, while less sensitive to the aversive properties of these stimuli. Additional experiments designed to parse specific components of reward-related processing using natural rewards have yielded more mixed findings, with reports of accentuated positive hedonic sensitivity during adolescence contrasting with studies showing less positive hedonic affect and reduced incentive salience at this age. Implications of these findings for adolescent substance abuse will be discussed.
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Reward circuitry includes the dopamine neurotransmitter system and its projections to reward-relevant subcortical regions such as the ventral striatum.
“This reward circuitry includes the DA neurotransmitter system and its projections to reward-relevant subcortical regions such as the ventral striatum (38).”
From Adolescent Neurodevelopment (2013) · cites this paper as [38]
Adolescent rats are often more sensitive than adults to the rewarding properties of stimuli ranging from desirable tastes, social peers, and novelty to drugs of abuse including cocaine, amphetamine, nicotine, and alcohol.
“Data supporting a strong biological component to this enhanced reward responsivity have been obtained using simple animal models, with adolescent rats likewise often more sensitive than adults to the rewarding properties of stimuli that range from desirable tastes, social peers, and novelty, to drugs of abuse including cocaine, amphetamine, nicotine, and alcohol (for review, see 38).”
From Adolescent Neurodevelopment (2013) · cites this paper as [38]
Adolescent rats are often less sensitive than adults to aversive properties of both non-drug and drug stimuli, with drug effects emerging at higher doses of the same drugs that at lower doses they find more reinforcing than adults.
“For instance, adolescent rats are often less sensitive than adults to aversive properties of both non-drug and drug stimuli, with the latter emerging at higher doses of the same drugs that, at lower doses, they conversely find more reinforcing than adults (cocaine, amphetamine, nicotine and alcohol)(38; 60; 61).”
From Adolescent Neurodevelopment (2013) · cites this paper as [38]
Non-deprived adolescent rats consistently show notably less sign-tracking than adults.
“We have found non-deprived adolescents to consistently exhibit notably less sign-tracking than adults (Doremus-Fitzwater et al, 2010; Anderson & Spear, 2011; Ung et al, 2010).”
From Rewards, aversions and affect in adolescence: emerging convergences across laboratory animal and human data (2011) · cites this paper as Doremus-Fitzwater et al, 2010
The exact nature of changes in affective processing, the relation with gonadal hormones, and how they affect motivational behavior in adolescents is not yet well understood.
“However, the exact nature of these changes, the relation with gonadal hormones, and how they affect motivational behavior in adolescents is not yet well understood (Doremus-Fitzwater et al., 2010).”
From Testosterone levels correspond with increased ventral striatum activation in response to monetary rewards in adolescents (2011) · cites this paper as Doremus-Fitzwater et al., 2010
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Social interactions and 50kHz ultrasonic vocalizations in adolescent and adult rats
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“Adolescence is a transitional period between childhood and adulthood characterized by behavioral, hormonal, and neurochemical changes designed to prepare organisms for independent survival (Casey et al., 2008; Doremus-Fitzwater et al., 2010; Spear, 2003).”
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- Authors
- Doremus-Fitzwater, T. L., Varlinskaya, E. I., & Spear, L. P.
- Affiliations
- Binghamton University (US)
- Corresponding author
- Spear, Linda P.
- Venue
- Brain and Cognition
- Publisher
- Elsevier BV
- Published
- 2010-02
- Volume
- 72
- Issue
- 1
- Pages
- 114-123
- ISSN
- 0278-2626 (ISSN-L)
- PMC
- PMC2814912
- OpenAlex
- W2041697442
- Cited by
- 397
- References
- 152
- Citations by year
- 2026: 5 · 2025: 11 · 2024: 9 · 2023: 12 · 2022: 20 · 2021: 13 · 2020: 25 · 2019: 22 · 2018: 34 · 2017: 25 · 2016: 28 · 2015: 33 · 2014: 30 · 2013: 42 · 2012: 28
- FWCI
- 2.53
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Brain and Cognition (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institutes of Health
- National Institute on Alcohol Abuse and Alcoholism (R01AA016887, R01AA012453)
- National Institute on Drug Abuse (R01DA019071)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural and Behavioral Psychology Studies
- Health Sciences › Medicine › Epidemiology › Substance Abuse Treatment and Outcomes
- Keywords
- adolescence, motivation system, substance abuse, risk-taking, novelty seeking, reward processing, conditioned aversion, natural reward, incentive salience, adolescent rats, age differences
- MeSH terms
- Adolescent, Animals, Brain, Humans, Motivation, Neural Pathways, Reward, Risk-Taking, Substance-Related Disorders
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