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Electrophysiological evidence for retrieval mode immediately after a task switch

Evans, Lisa H. ORCID:, Williams, Angharad N. ORCID: and Wilding, Edward L. ORCID: 2015. Electrophysiological evidence for retrieval mode immediately after a task switch. NeuroImage 108 , pp. 435-440. 10.1016/j.neuroimage.2014.12.068

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It has been suggested that retrieving episodic information can involve adopting a cognitive state or set: retrieval mode. In a series of studies, an event-related potential (ERP) index of retrieval mode has been identified in designs which cue participants on a trial-by-trial basis to switch between preparing for and then completing an episodic or non-episodic retrieval task. However, a confound in these studies is that along with task type the content of what is to be retrieved has varied. Here we examined whether the ERP index of retrieval mode remains when the contents of an episodic and non-episodic task are highly similar – both requiring a location judgement. In the episodic task participants indicated the screen location where words had been shown in a prior study phase (left/right/new); whereas in the perceptual task they indicated the current screen location of the word (top/middle/bottom). Consistent with previous studies the ERPs elicited while participants prepared for episodic retrieval were more positive-going at right-frontal sites than when they prepared for the perceptual task. This index was observed, however, on the first trial after participants had switched tasks, rather than on the second trial, as has been observed previously. Potential reasons for this are discussed, including the critical manipulation of similarity in contents between tasks, as well as the use of a predictable cue sequence.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Cardiff University Brain Research Imaging Centre (CUBRIC)
Additional Information: This is an open access article under the CC-BY license.
Publisher: Elsevier
ISSN: 1053-8119
Funders: BBSRC & BIAL Foundation
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 26 December 2014
Last Modified: 06 Jan 2024 03:33

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