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图片编码与检索过程中熟悉感和回忆的可分离神经关联

Dissociable neural correlates for familiarity and recollection during the encoding and retrieval of pictures.

作者信息

Duarte Audrey, Ranganath Charan, Winward Laurel, Hayward Dustin, Knight Robert T

机构信息

Department of Molecular and Cellular Biology, University of California at Berkeley, 4143 Tolman Hall, Berkeley, CA 94720-5050, USA.

出版信息

Brain Res Cogn Brain Res. 2004 Feb;18(3):255-72. doi: 10.1016/j.cogbrainres.2003.10.010.

Abstract

Results from behavioral studies have supported the idea that recognition memory can be supported by at least two different processes, recollection and familiarity. However, it remains unclear whether these two forms of memory reflect neurally distinct processes. Furthermore, it is unclear whether recollection and familiarity can be best conceived as differing primarily in terms of retrieval processing, or whether they additionally differ at encoding. To address these issues, we used event-related brain potentials (ERPs) to monitor neural correlates of familiarity and recollection at both encoding and retrieval. Participants studied pictures of objects in two types of study blocks and subsequently made remember-know and source memory judgments during retrieval. Results showed that, during encoding, neural correlates of subsequent familiarity and recollection onsetted in parallel, but exhibited differences in scalp topography and time course. Subsequent familiarity-based recognition was associated with a left-lateralized enhanced positivity and observed at anterior scalp sites from 300 to 450 ms, whereas subsequent recollection was associated with a topographically distinct right-lateralized positivity at anterior scalp sites from 300 to 450 ms and bilateral activity from 450 to 600 ms. During retrieval, neural correlates of familiarity emerged earlier than correlates of recollection. Familiarity was associated with an enhanced positivity at frontopolar scalp sites from 150 to 450 ms, whereas recollection was associated with positive ERP modulations over bilateral frontal (300-600 ms) and parietal (450-800 ms) sites. These results demonstrate that familiarity and recollection reflect the outcome of neurally distinct memory processes at both encoding and retrieval.

摘要

行为学研究结果支持了这样一种观点,即识别记忆至少可以由两种不同的过程来支持,即回忆和熟悉感。然而,目前尚不清楚这两种记忆形式是否反映了神经上不同的过程。此外,尚不清楚回忆和熟悉感是否最好主要被认为在检索过程方面存在差异,或者它们在编码时是否也存在差异。为了解决这些问题,我们使用事件相关脑电位(ERP)来监测编码和检索过程中熟悉感和回忆的神经关联。参与者在两种类型的学习块中研究物体的图片,随后在检索过程中做出记得-知道和来源记忆判断。结果表明,在编码过程中,后续熟悉感和回忆的神经关联同时开始,但在头皮地形图和时间进程上表现出差异。基于后续熟悉感的识别与左侧化的增强正电位相关,在300至450毫秒时在前额头皮部位观察到,而后续回忆与在前额头皮部位300至450毫秒时在地形图上不同的右侧化正电位以及450至600毫秒时的双侧活动相关。在检索过程中,熟悉感的神经关联比回忆的神经关联出现得更早。熟悉感与150至450毫秒时额极头皮部位的增强正电位相关,而回忆与双侧额叶(300 - 600毫秒)和顶叶(450 - 800毫秒)部位的正性ERP调制相关。这些结果表明,熟悉感和回忆在编码和检索过程中都反映了神经上不同的记忆过程的结果。

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