Gilboa Asaf
Baycrest Centre for Geriatric Care, Rotman Research Institute, Baycrest Centre 3560 Bathurst Steet, Toronto, Ont., Canada M6A 2E1.
Neuropsychologia. 2004;42(10):1336-49. doi: 10.1016/j.neuropsychologia.2004.02.014.
Laboratory investigations of episodic memory often require participants to encode and later retrieve lists of items (words, pictures, or faces). The underlying assumption is that recollection of items from the list is analogous to recollection of events from one's past, i.e. autobiographical re-experiencing. Functional neuroimaging studies of episodic memory have provided extensive evidence suggesting that regions of the prefrontal cortex (PFC) play a role in episodic memory retrieval. A review of PFC activations reported in imaging studies of autobiographical memory and matched sub-sets of list-learning episodic memory studies reveals patterns of similarity but also substantial differences. Episodic memory studies often report activations in the right mid-dorsolateral PFC, but such activations are absent in autobiographical memory studies. Additionally, activations in the ventromedial PFC, primarily on the left, are almost invariably found in autobiographical memory studies, but rarely occur in studies of episodic memory. It is suggested that these two regions mediate different modes of post-retrieval monitoring and verification. Autobiographical memory relies on quick intuitive 'feeling of rightness' to monitor the veracity and cohesiveness of retrieved memories in relation to an activated self-schema. Episodic memory for lists requires more conscious elaborate monitoring to avoid omissions, commissions and repetitions. The present analysis suggests that care and caution should be exercised in extrapolating from the way we recollect 'events' from a list learned in the laboratory to the way we recollect events from our lives.
情景记忆的实验室研究通常要求参与者对一系列项目(单词、图片或面孔)进行编码,随后进行回忆。其潜在假设是,从列表中回忆项目类似于回忆个人过去的事件,即自传式的重新体验。情景记忆的功能性神经影像学研究提供了大量证据,表明前额叶皮层(PFC)区域在情景记忆检索中发挥作用。对自传体记忆成像研究以及列表学习情景记忆研究的匹配子集报告的PFC激活情况进行回顾,发现了相似模式,但也存在显著差异。情景记忆研究经常报告右侧中背外侧PFC有激活,但在自传体记忆研究中没有这种激活。此外,腹内侧PFC的激活,主要在左侧,几乎在自传体记忆研究中总是能发现,但在情景记忆研究中很少出现。有人认为,这两个区域介导了检索后监测和验证的不同模式。自传体记忆依靠快速直观的“正确感”来监测检索到的记忆与激活的自我图式相关的准确性和连贯性。对列表的情景记忆需要更有意识的精细监测,以避免遗漏、错误和重复。目前的分析表明,在从我们回忆实验室中学习的列表中的“事件”的方式推断到我们回忆生活中的事件的方式时,应该谨慎小心。