Couwenberg Linda E, Boksem Maarten A S, Sanfey Alan G, Smidts Ale
Rotterdam School of Management, Erasmus University Rotterdam, Rotterdam, Netherlands.
Donders Institute for Brain, Cognition and Behavior, Radboud University Nijmegen, Nijmegen, Netherlands.
Front Neurosci. 2020 Jun 3;14:502. doi: 10.3389/fnins.2020.00502. eCollection 2020.
When asked to select several options at once, people tend to choose a greater diversity of items than when they are asked to make these selections one at a time. Using functional magnetic resonance imaging (fMRI), we provide novel insight into the neural mechanisms underlying diversification in portfolio choices. We found that, as participants made multiple selections from a menu of different options, the current state of their choice portfolio (i.e., the previously selected options) dynamically modulates activity in the neural valuation system in response to the options under evaluation. More specifically, we found that activity in the ventral striatum (VS) decreases when the option has already been selected ("satiation"), while activity in the ventromedial prefrontal cortex increases when other options have previously been selected ("novelty-seeking"). Our findings reveal two processes that drive diversification in portfolio choices, and suggest that the context of previous selections strongly impacts how the brain evaluates current choice options.
当被要求一次性选择多个选项时，人们往往会比被要求一次只做一个选择时选择更多样化的项目。我们使用功能磁共振成像（fMRI），对投资组合选择中多样化背后的神经机制提供了新的见解。我们发现，当参与者从不同选项菜单中进行多次选择时，他们当前的选择组合状态（即先前选择的选项）会动态调节神经评估系统对正在评估的选项的反应活动。更具体地说，我们发现当选项已经被选中时（“满足”），腹侧纹状体（VS）的活动会减少，而当先前已经选择了其他选项时（“寻求新奇”），腹内侧前额叶皮层的活动会增加。我们的研究结果揭示了驱动投资组合选择多样化的两个过程，并表明先前选择的背景会强烈影响大脑如何评估当前的选择选项。
