An EEG Analysis: The Temporal Dynamics of Episodic Memory in the Parietal Cortex
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Date
2019
Authors
Back, Ariel Nicole
Journal Title
Journal ISSN
Volume Title
Publisher
University of Oregon
Abstract
Recently fMRI studies by Kuhl and Chun (2014) demonstrated that the lateral parietal cortex (LPC) is implicated in content reactivation through recall-related activity patterns. The LPC signals that memories have been successfully recalled and it actively represents the content that is being remembered. However, given that fMRI reports data spatially, there is a lack of information regarding the temporal nature of recognition during memory retrieval. By conducting a test of episodic memory via EEG and examining the time course of memory retrieval, this project used decoding classification to investigate when in time the brain processes information for different tasks. We trained a classifier to distinguish between old (familiar) and new (unfamiliar) images, as well as images of faces and scenes, to define distinct neural processes that allow for classification into the two distinct categories. We found that the memory classifier peaks over a time course similar to the Old vs New ERP literature. Additionally, we found that across tasks in the parietal region and the frontal regions, these regions are generally not task dependent, but rather are relatively automatic.
Description
51 pages
Keywords
Psychology, Episodic, Parietal Lobe, Temporal Dynamics, Memory, Declarative