Subjective value representations during effort, probability and time discounting across adulthood.
Subjective value representations during effort, probability and time discounting across adulthood.
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在成年期间努力，概率和时间折扣期间的主观价值表示。
DOI：
10.1093/scan/nsy021
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发表时间：
2018-05-01
影响因子：
4.2
通讯作者：
Samanez-Larkin GR
中科院分区：
文献类型：
--
作者：
Seaman KL;Brooks N;Karrer TM;Castrellon JJ;Perkins SF;Dang LC;Hsu M;Zald DH;Samanez-Larkin GR
每天，人类都要做出无数的决策，这些决策需要将潜在利益（即奖励）的信息与其他决策特征（即所需的努力、结果的可能性或时间延迟）整合在一起。在这里，我们研究的重叠和解离的行为偏好和神经表征的主观价值的背景下，三个不同的决策功能（体力劳动，概率和时间延迟）在一个健康的成年人的寿命样本。在进行功能性神经成像时，参与者（N = 75）在较小的金钱奖励与较低的体力劳动、较高的概率或较短的时间延迟之间做出激励相容的选择，而较大的金钱奖励与较高的体力劳动、较低的概率或较长的时间延迟之间做出激励相容的选择。行为偏好估计从观察到的选择，主观价值计算使用个人双曲线折扣函数。我们发现，折扣率是不相关的任务。尽管偏好之间存在明显的行为分离，但我们发现，在所有三项任务中，内侧前额叶皮层的主观价值相关活动都是重叠的。我们没有发现一致的证据表明，在整个成年期，偏好或主观价值的神经表征存在年龄差异。这些结果表明，虽然决策特征的容忍度是行为分离的，但主观价值信号在成年期有着共同的表现。
Every day, humans make countless decisions that require the integration of information about potential benefits (i.e. rewards) with other decision features (i.e. effort required, probability of an outcome or time delays). Here, we examine the overlap and dissociation of behavioral preferences and neural representations of subjective value in the context of three different decision features (physical effort, probability and time delays) in a healthy adult life span sample. While undergoing functional neuroimaging, participants (N = 75) made incentive compatible choices between a smaller monetary reward with lower physical effort, higher probability, or a shorter time delay versus a larger monetary reward with higher physical effort, lower probability, or a longer time delay. Behavioral preferences were estimated from observed choices, and subjective values were computed using individual hyperbolic discount functions. We found that discount rates were uncorrelated across tasks. Despite this apparent behavioral dissociation between preferences, we found overlapping subjective value-related activity in the medial prefrontal cortex across all three tasks. We found no consistent evidence for age differences in either preferences or the neural representations of subjective value across adulthood. These results suggest that while the tolerance of decision features is behaviorally dissociable, subjective value signals share a common representation across adulthood.
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影响因子：
5.7
作者：
Bartra, Oscar;McGuire, Joseph T.;Kable, Joseph W.
通讯作者：
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影响因子：
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作者：
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作者：
Kable, Joseph W.;Glimcher, Paul W.
通讯作者：
Glimcher, Paul W.
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