Lab. Neurogenómica Cognitiva, Coord. Psicobiología y Neurociencias, Fac. Psicología, Universidad Nacional Autónoma de México (UNAM), Ciudad de México, Mexico.
Unidad de Investigación Interdisciplinaria en Ciencias de la Salud y la Educación, Facultad de Estudios Superiores Iztacala, Universidad Nacional Autónoma de México, Tlalnepantla, Estado de México, Mexico.
Behav Brain Res. 2022 Oct 28;435:114057. doi: 10.1016/j.bbr.2022.114057. Epub 2022 Aug 12.
Episodic memory allows us to remember three main elements regarding an event: what (it is), where (it is in space), and when (it appears). The brain's electrical activity signaling the occurrence of these processes has been studied separately, revealing different patterns of ERP components and changes in the EEG theta band amplitude. However, how these patterns signal the retrieval of the temporal and spatial contexts of the same episode is unknown. The objective of this study was to evaluate the ERP components and the EEG theta band in association to the retrieval of the what, where, and when of the same episode through a source memory task. Three types of trials were identified here: total retrieval (what, where, and when), spatial retrieval (what and where), and correct rejections (correctly identified as new items). Attentional components, N200 and P300, and theta band were sensitive to the amount of information retrieved from episodic memory. Total retrieval and spatial trials elicited higher mean amplitude of FN400 and LPC, familiarity and recollection markers, respectively, than correct rejections. Our results suggest that early attention mechanisms can discern the strength of retrieval; in turn, familiarity and recollection mechanisms participate in the retrieval of the main contexts of episodic memory, but not in a cumulative way.
是什么（它是什么），在哪里（它在空间中的位置），以及何时（它出现）。大脑的电活动信号表明这些过程的发生，已经分别进行了研究，揭示了 ERP 成分和 EEG θ波段幅度的不同模式变化。然而，这些模式如何标记同一情节的时间和空间上下文的检索是未知的。本研究的目的是通过源记忆任务评估 ERP 成分和 EEGθ波段与同一情节的检索的是什么、在哪里和何时的关系。这里确定了三种类型的试验：总检索（是什么、在哪里和何时）、空间检索（是什么和在哪里）和正确拒绝（正确识别为新项）。注意成分、N200 和 P300 以及θ波段对从情景记忆中检索到的信息量敏感。总检索和空间试验引起的 FN400 和 LPC 的平均振幅均高于正确拒绝，分别为 FN400 和 LPC，分别为熟悉度和再认度标记。我们的结果表明，早期注意机制可以辨别检索的强度；反过来，熟悉度和再认机制参与情景记忆的主要上下文的检索，但不是累积方式。
