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Tracking the intrusion of unwanted memories into awareness with event-related potentials

Hellerstedt, Robin, Johansson, Mikael, Anderson, Michael C. (2016) Tracking the intrusion of unwanted memories into awareness with event-related potentials. Neuropsychologia, 89 . pp. 510-523. ISSN 0028-3932. E-ISSN 1873-3514. (doi:10.1016/j.neuropsychologia.2016.07.008) (KAR id:79990)

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Involuntary retrieval of unwanted memories is a common symptom in several clinical disorders, including post-traumatic stress disorder. With an aim to track the temporal dynamics of such memory intrusions, we recorded electrophysiological measures of brain activity while participants engaged in a Think/No-Think task. We presented the left hand word (the cue) of previously encoded word pairs in green or red font. We asked participants to think of the associated right hand word (the associate) when the cue appeared in green (Think condition) and to avoid thinking of the associate when the cue appeared in red (No-Think condition). To isolate cases when participants experienced an intrusive memory, at the end of each trial, participants judged whether the response had come to mind; we classified memories that came to mind during No-Think trials, despite efforts to stop retrieval, as intrusions. In an event-related potential (ERP) analysis, we observed a negative going slow wave (NSW) effect that indexed the duration of a trace in mnemonic awareness; whereas voluntary retrieval and maintenance of the associate was related to a sustained NSW that lasted throughout the 3-s recording epoch, memory intrusions generated short-lived NSWs that were rapidly truncated. Based on these findings, we hypothesize that the intrusion-NSW reflects the associate briefly penetrating working memory. More broadly, these findings exploit the high temporal resolution of ERPs to track the online dynamics of memory intrusions.

Item Type: Article
DOI/Identification number: 10.1016/j.neuropsychologia.2016.07.008
Uncontrolled keywords: intrusive memory, involuntary retrieval, ERP, think/no-think, episodic memory, forgetting
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Divisions: Divisions > Division of Human and Social Sciences > School of Psychology
Depositing User: Robin Hellerstedt
Date Deposited: 08 Feb 2020 16:21 UTC
Last Modified: 16 Feb 2021 14:11 UTC
Resource URI: (The current URI for this page, for reference purposes)
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