Induced electroencephalogram oscillations during source memory:: Familiarity is reflected in the gamma band, recollection in the theta band
Induced electroencephalogram oscillations during source memory:: Familiarity is reflected in the gamma band, recollection in the theta band
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DOI：
10.1162/jocn.2008.20068
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发表时间：
2008-06-01
影响因子：
3.2
通讯作者：
Mueller, Matthias M.
中科院分区：
文献类型：
--
作者：
Gruber, Thomas;Tsivilis, Dimitris;Mueller, Matthias M.
在诱发的伽马和θ波频率范围内的振荡脑电图（EEG）活动的调节（诱发的伽马和θ波波段反应；iGBRs: bbb30 Hz； iTBRs：类似于6 Hz）与从长期记忆中检索信息有关。然而，这两种形式的振荡活动的具体功能作用仍不清楚。本研究在双过程框架内考察了θ -振荡和γ -振荡，该框架将“熟悉”和“回忆”定义为识别记忆的两个组成过程。在编码过程中，参与者被要求对不同的物体图片做出“比鞋盒大/小”或“有生命/没有生命”的决定。在检索过程中，“旧/新”识别之后（对于被判断为旧的项目）是一个关于每个项目在编码时所做决定的源识别任务。igbr （35-80 Hz; 210-330 msec）在正确识别“旧”物体方面比“新”物体要高。重要的是，他们没有区分成功和不成功的来源判断。相比之下，iTBRs （4-7.5 Hz; 600-1200 msec）对源识别敏感。我们认为igbr反映了与熟悉性相关的检索过程相关的早期联想过程，而itbr反映了后来的启动性、情景性和回忆相关的机制。
Modulations of oscillatory electroencephalogram (EEG) activity in the induced gamma and theta frequency ranges (induced gamma and theta band responses; iGBRs: > 30 Hz; iTBRs: similar to 6 Hz) have been associated with retrieval of information from long-term memory. However, the specific functional role of these two forms of oscillatory activity remains unclear. The present study examines theta- and gamma-oscillations within a dual-process framework, which defines "familiarity" and "recollection" as the two component processes of recognition memory. During encoding, participants were instructed to make "bigger/smaller than a shoebox" or "living/nonliving" decisions for different object pictures. During retrieval "old/new" recognition was followed (for items judged old) by a source discrimination task regarding the decision made for each item at encoding. iGBRs (35-80 Hz; 210-330 msec) were higher for correctly identified "old" relative to "new" objects. Importantly, they did not distinguish between successful and unsuccessful source judgments. In contrast, iTBRs (4-7.5 Hz; 600-1200 msec) were sensitive to source discrimination. We propose that iGBRs mirror early associative processes linked to Familiarity-related retrieval processes, whereas iTBRs reflect later onsetting, episodic, recollection-related mechanisms.