Continuous Theta Burst Stimulation of Angular Gyrus Reduces Subjective Recollection

Yazar, Yasemin, Bergström, Zara M, Simons, Jon S (2014) Continuous Theta Burst Stimulation of Angular Gyrus Reduces Subjective Recollection. PLoS ONE, 9 (10). e110414. ISSN 1932-6203. E-ISSN 1932-6203. (doi:10.1371/journal.pone.0110414)

Abstract

The contribution of lateral parietal regions such as the angular gyrus to human episodic memory has been the subject of much debate following widespread observations of left parietal activity in healthy volunteers during functional neuroimaging studies of memory retrieval. Patients with lateral parietal lesions are not amnesic, but recent evidence indicates that their memory abilities may not be entirely preserved. Whereas recollection appears intact when objective measures such as source accuracy are used, patients often exhibit reduced subjective confidence in their accurate recollections. When asked to recall autobiographical memories, they may produce spontaneous narratives that lack richness and specificity, but can remember specific details when prompted. Two distinct theoretical accounts have been proposed to explain these results: that the patients have a deficit in the bottom-up capturing of attention by retrieval output, or that they have an impairment in the subjective experience of recollection. The present study aimed to differentiate between these accounts using continuous theta burst stimulation (cTBS) in healthy participants to disrupt function of specific left parietal subregions, including angular gyrus. Inconsistent with predictions of the attentional theory, angular gyrus cTBS did not result in greater impairment of free recall than cued recall. Supporting predictions of the subjective recollection account, temporary disruption of angular gyrus was associated with highly accurate source recollection accuracy but a selective reduction in participants’ rated source confidence. The findings are consistent with a role for angular gyrus in the integration of memory features into a conscious representation that enables the subjective experience of remembering.

Item Type: Article
DOI/Identification number: 10.1371/journal.pone.0110414
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Divisions: Faculties > Social Sciences > School of Psychology > Cognitive Psychology
Depositing User: Zara Bergstrom
Date Deposited: 26 Dec 2014 10:28 UTC
Last Modified: 29 May 2019 13:58 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46309 (The current URI for this page, for reference purposes)
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