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  Risk-sensitivity and the mean-variance trade-off: decision making in sensorimotor control

Nagengast, A., Braun, D., & Wolpert, D. (2011). Risk-sensitivity and the mean-variance trade-off: decision making in sensorimotor control. Proceedings of the Royal Society of London B, 278(1716), 2325-2332. doi:0.1098/rspb.2010.2518.

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資料種別: 学術論文

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 作成者:
Nagengast, AJ, 著者
Braun, DA1, 著者           
Wolpert, DM, 著者
所属:
1Research Group Sensorimotor Learning and Decision-Making, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497809              

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 要旨: Numerous psychophysical studies suggest that the sensorimotor system chooses actions that optimize the average cost associated with a movement. Recently, however, violations of this hypothesis have been reported in line with economic theories of decision-making that not only consider the mean payoff, but are also sensitive to risk, that is the variability of the payoff. Here, we examine the hypothesis that risk-sensitivity in sensorimotor control arises as a mean-variance trade-off in movement costs. We designed a motor task in which participants could choose between a sure motor action that resulted in a fixed amount of effort and a risky motor action that resulted in a variable amount of effort that could be either lower or higher than the fixed effort. By changing the mean effort of the risky action while experimentally fixing its variance, we determined indifference points at which participants chose equiprobably between the sure, fixed amount of effort option and the risky, variable effort option. Depending on whether participants accepted a variable effort with a mean that was higher, lower or equal to the fixed effort, they could be classified as risk-seeking, risk-averse or risk-neutral. Most subjects were risk-sensitive in our task consistent with a mean-variance trade-off in effort, thereby, underlining the importance of risk-sensitivity in computational models of sensorimotor control.

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 日付: 2011-01
 出版の状態: 出版
 ページ: -
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 識別子(DOI, ISBNなど): URI: http://rspb.royalsocietypublishing.org/content/278/1716/2325.full.pdf+html
DOI: 0.1098/rspb.2010.2518
BibTex参照ID: NagengastBW2011_2
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出版物名: Proceedings of the Royal Society of London B
種別: 学術雑誌
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出版社, 出版地: -
ページ: - 巻号: 278 (1716) 通巻号: - 開始・終了ページ: 2325 - 2332 識別子(ISBN, ISSN, DOIなど): -