Department of Psicologia, Campus Riu Sec, Fac. Ciències Humanes i Socials, Universitat Jaume I, E-12071 Castelló, Spain.
Soc Cogn Affect Neurosci. 2012 Apr;7(4):423-30. doi: 10.1093/scan/nsr028. Epub 2011 Jul 6.
The reinforcement sensitivity theory (RST) relates individual differences in reward sensitivity to the activation of the behavioral approach system (BAS). Dopamine-related brain structures have been repeatedly associated with reward processing, but also with cognitive processes such as task switching. In the present study, we examined the association between reward sensitivity and the event-related fMRI BOLD response with set switching in 31 males. As expected, the right inferior frontal cortex (rIFG) and the striatum (i.e. the left putamen) were involved in set-switching activity for the overall sample. Interindividual differences in Gray's reward sensitivity were related to stronger activity in the rIFG and the ventral striatum. Thus, trait reward sensitivity contributed to the modulation of brain responsiveness in set-switching tasks. Having considered previous research, we propose that higher BAS activity is associated with a stronger reward to process a better implementation of goal-directed tasks and the diminished processing of secondary cues.
强化敏感性理论（RST）将个体在奖励敏感性方面的差异与行为趋近系统（BAS）的激活联系起来。多巴胺相关的大脑结构与奖励处理有关，但也与认知过程如任务转换有关。在本研究中，我们在 31 名男性中检查了奖励敏感性与事件相关 fMRI BOLD 反应之间的关系，以及在设定转换时的关系。正如预期的那样，右侧额下回（rIFG）和纹状体（即左侧壳核）参与了整个样本的设定转换活动。个体之间在格雷奖励敏感性方面的差异与 rIFG 和腹侧纹状体的活动增强有关。因此，特质奖励敏感性有助于调节设定转换任务中的大脑反应性。考虑到之前的研究，我们提出更高的 BAS 活动与更强的奖励处理有关，这可以更好地实现目标导向任务，并减少次要线索的处理。
