Bibliographic Details
| Title: |
Dopamine D1 Receptors and Nonlinear Probability Weighting in Risky Choice. |
| Authors: |
Takahashi, Hidehiko, Matsui, Hiroshi, Camerer, Colin, Takano, Harumasa, Kodaka, Fumitoshi, Ideno, Takashi, Okubo, Shigetaka, Takemura, Kazuhisa, Arakawa, Ryosuke, Eguchi, Yoko, Murai, Toshiya, Okubo, Yoshiro, Kato, Motoichiro, Ito, Hiroshi, Suhara, Tetsuya |
| Source: |
Journal of Neuroscience; 12/8/2010, Vol. 30 Issue 49, p16567-16572, 6p |
| Subject Terms: |
DOPAMINE receptors, DRUG utilization, GAMBLING, NORMATIVE theory (Communication), DECISION making, NEURAL transmission, POSITRON emission tomography, STATISTICAL weighting |
| Abstract: |
Misestimating risk could lead to disadvantaged choices such as initiation of drug use (or gambling) and transition to regular drug use (or gambling). Although the normative theory in decision-making under risks assumes that people typically take the probability-weighted expectation over possible utilities, experimental studies of choices among risks suggest that outcome probabilities are transformed nonlinearly into subjective decision weights by a nonlinear weighting function that overweights low probabilities and underweights high probabilities. Recent studies have revealed the neurocognitive mechanism of decision-making under risk. However, the role of modulatory neurotransmission in this process remains unclear. Using positron emission tomography, we directly investigated whether dopamineD1 and D2 receptors in the brain are associated with transformation of probabilities into decision weights in healthy volunteers. The binding of striatal D1 receptors is negatively correlated with the degree of nonlinearity of weighting function. Individuals with lower striatal D1 receptor density showed more pronounced overestimation of low probabilities and underestimation of high probabilities. This finding should contribute to a better understanding of the molecular mechanism of risky choice, and extreme or impaired decisionmaking observed in drug and gambling addiction. [ABSTRACT FROM AUTHOR] |
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| Database: |
Complementary Index |
