Dopamine D1 receptors and nonlinear probability weighting in risky choice

Hidehiko Takahashi, Hiroshi Matsui, Colin Camerer, Harumasa Takano, Fumitoshi Kodaka, Takashi Ideno, Shigetaka Okubo, Kazuhisa Takemura, Ryosuke Arakawa, Yoko Eguchi, Toshiya Murai, Yoshiro Okubo, Motoichiro Kato, Hiroshi Ito, Tetsuya Suhara

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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 dopamine D1 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 decision-making observed in drug and gambling addiction.

Original languageEnglish
Pages (from-to)16567-16572
Number of pages6
JournalJournal of Neuroscience
Volume30
Issue number49
DOIs
Publication statusPublished - 2010 Dec 8

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ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Takahashi, H., Matsui, H., Camerer, C., Takano, H., Kodaka, F., Ideno, T., Okubo, S., Takemura, K., Arakawa, R., Eguchi, Y., Murai, T., Okubo, Y., Kato, M., Ito, H., & Suhara, T. (2010). Dopamine D1 receptors and nonlinear probability weighting in risky choice. Journal of Neuroscience, 30(49), 16567-16572. https://doi.org/10.1523/JNEUROSCI.3933-10.2010