Working memory load for faces modulates P300, N170, and N250r

Morgan, Helen M., Klein, Christoph, Boehm, Stephan G., Shapiro, Kimron L. and Linden, David Edmund Johannes ORCID: https://orcid.org/0000-0002-5638-9292 2008. Working memory load for faces modulates P300, N170, and N250r. Journal of Cognitive Neuroscience 20 (6) , pp. 989-1002. 10.1162/jocn.2008.20072

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Abstract

We used event-related potential (ERP) methodology to examine neural activity associated with visual working memory (WM) for faces. There were two main goals. First, to extend previous findings of P300 load modulation to WM for faces. Second, to examine whether N170 and N250r are also influenced by WM load. Between one and four unfamiliar faces were simultaneously presented for memory encoding. After a 1-sec delay, a target whether this face was part of the previous face array. P300 amplitude decreased as WM load increased, and this P300 suppression was observed at both encoding and retrieval. WM load was also found to modulate other ERPs. The amplitude of the N170 elicited by the target face decreased with load, and this N170 decrease leveled off at load 2, reflecting the behavioral WM capacity of around two faces. In addition, the N250r, observed as an ERP difference for target faces that were present in the encoding array relative to target faces that were absent, was also reduced for higher WM loads. These findings extend previous work by showing that P300 modulation by WM load also occurs for faces. Furthermore, we show, for the first time, that WM load affects the N250r and the early visual N170 component. This suggests that higher visual areas play an important role in WM for faces.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Medicine Psychology MRC Centre for Neuropsychiatric Genetics and Genomics (CNGG) Neuroscience and Mental Health Research Institute (NMHRI)
Subjects:	R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry R Medicine > RM Therapeutics. Pharmacology
Additional Information:	Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0898-929X/ (accessed 26/02/2014).
Publisher:	MIT Press
ISSN:	0898-929x
Date of First Compliant Deposit:	30 March 2016
Last Modified:	07 May 2023 10:43
URI:	https://orca.cardiff.ac.uk/id/eprint/17375

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