Brandt Valerie C, Bergström Zara M, Buda Marie, Henson Richard N A, Simons Jon S
Department of Psychology and Behavioural and Clinical Neuroscience Institute, University of Cambridge, Cambridge, UK.
Cogn Affect Behav Neurosci. 2014 Mar;14(1):209-19. doi: 10.3758/s13415-013-0189-z.
Failing to remember whether we performed, or merely imagined performing, an everyday action can occasionally be inconvenient, but in some circumstances it can have potentially dangerous consequences. In this fMRI study, we investigated the brain activity patterns, and objective and subjective behavioral measures, associated with recollecting such everyday actions. We used an ecologically valid "reality-monitoring" paradigm in which participants performed, or imagined performing, specified actions with real objects drawn from one of two boxes. Lateral brain areas, including prefrontal cortex, were active when participants recollected both the actions that had been associated with objects and the locations from which they had been drawn, consistent with a general role in source recollection. By contrast, medial prefrontal and motor regions made more specific contributions, with supplementary motor cortex activity being associated with recollection decisions about actions but not locations, and medial prefrontal cortex exhibiting greater activity when remembering performed rather than imagined actions. These results support a theoretical interpretation of reality monitoring that entails the fine-grained discrimination between multiple forms of internally and externally generated information.
记不清我们是实际执行了某个日常行为，还是仅仅想象自己执行了该行为，偶尔会带来不便，但在某些情况下可能会产生潜在的危险后果。在这项功能磁共振成像（fMRI）研究中，我们调查了与回忆此类日常行为相关的大脑活动模式、客观和主观行为指标。我们采用了一种生态效度较高的“现实监控”范式，让参与者用从两个盒子之一中取出的真实物体执行或想象执行特定动作。当参与者回忆与物体相关的动作以及物体的取出位置时，包括前额叶皮层在内的大脑外侧区域会被激活，这与源记忆中的一般作用一致。相比之下，内侧前额叶和运动区域有更具体的贡献，辅助运动皮层的活动与关于动作而非位置的回忆决策相关，并且当回忆实际执行的动作而非想象的动作时，内侧前额叶皮层表现出更强的活动。这些结果支持了对现实监控的一种理论解释，即需要对多种形式的内部和外部生成信息进行细粒度的区分。
