Risky decision-making predicts dopamine release dynamics in nucleus accumbens shell
Timothy G Freels1, Daniel B K Gabriel1, Deranda B Lester1
1Department of Psychology, The University of Memphis, Memphis, TN, 38152, USA.
Summary
Rats showing higher risk-taking behaviors exhibit greater dopamine release in the nucleus accumbens shell. This suggests that elevated phasic dopamine signaling is linked to increased risk preference and may be a therapeutic target.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
- Psychopharmacology
Background:
- Dopaminergic drugs influence risk-taking behavior.
- Individual differences in dopamine signaling's role in risk preference are not well understood.
Purpose of the Study:
- To investigate the association between phasic dopamine dynamics in the nucleus accumbens shell (NACs) and individual differences in risky decision-making in rats.
- To determine if baseline dopamine signaling predicts risk preference.
Main Methods:
- Utilized in vivo fixed potential amperometry in male Long-Evans rats.
- Assessed risk-taking using the risky decision-making task (RDT), involving choices between safe and risky rewards with potential punishment.
- Measured medial forebrain bundle-evoked dopamine release in the NACs.
Main Results:
- A positive correlation was found between medial forebrain bundle-evoked dopamine release in the NACs and risky decision-making.
- "Risk-taking" rats showed significantly greater phasic dopamine release than "risk-averse" rats.
- Risky decision-making predicted enhanced sensitivity to nomifensine and elevated autoreceptor function, a phenotype specific to risk-taking and not delay discounting.
Conclusions:
- Phasic dopamine release in the NACs is associated with individual differences in risk-taking behavior.
- A hyperdopaminergic phenotype in the NACs may underlie excessive risk-taking.
- Phasic NACs dopamine signaling represents a potential therapeutic target for conditions characterized by excessive risk-taking.
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