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Self-perspective in episodic memory after parietal damage and in healthy ageing

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Title: Self-perspective in episodic memory after parietal damage and in healthy ageing
Authors: Russell, C
Davies, S
Li, K
Musil, A-S
Malhotra, PA
Williams, AL
Item Type: Journal Article
Abstract: Although there is strong support from functional imaging studies for lateral parietal lobe involvement in episodic memory, patients with damage to these regions do not appear to suffer from severe deficits in this cognitive domain. As such there has been no definitive explanation of this area's precise involvement. Here, we hypothesised that parietal regions play a crucial role in episodic memory - specifically in recollecting details from an egocentric perspective. In order to test this hypothesis systematically, we designed a novel experimental task utilising a head-mounted camera to record images from the participant's perspective, enabling us to evaluate the integrity of memory from the individual's own point of view. In the first study we examined patients with parietal damage and in a second study, using fMRI, we examined young and older healthy participants. Right-hemisphere patients with parietal damage were able to recall information accurately when recollecting what items had been present and where these items had been. However, patients were significantly impaired when attempting to judge from which perspective they had viewed the scenes. Critically, the patient group showed no evidence of impairment on standard tests of episodic and working memory. Examination of healthy participants in the second study utilised multi-voxel pattern analysis on neural activity during the recognition phase of a similar task. This revealed sensitivity to be highest around the angular gyrus of the lateral parietal cortex for our critical comparison - that is, when viewing stimuli that were the same as their egocentric view during encoding versus the identical scene but presented from an alternative angle. Our results provide important evidence that parietal cortex is directly involved in egocentric spatial perspective aspects of episodic memory and demonstrate for the first time a specific deficit in episodic memory in patients with right parietal damage.
Issue Date: 18-Feb-2019
Date of Acceptance: 14-Dec-2018
URI: http://hdl.handle.net/10044/1/65363
DOI: https://dx.doi.org/10.1016/j.neuropsychologia.2018.12.013
ISSN: 0028-3932
Publisher: Elsevier
Start Page: 171
End Page: 181
Journal / Book Title: Neuropsychologia
Volume: 124
Copyright Statement: © 2018 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Ageing
Episodic memory
Parietal cortex
parietal cortex
1109 Neurosciences
1701 Psychology
1702 Cognitive Science
Experimental Psychology
Publication Status: Published
Conference Place: England
Online Publication Date: 2018-12-17
Appears in Collections:Department of Medicine (up to 2019)