Universität zu Köln

Hecht, Marcus, Thiemann, Ulf, Freitag, Christine M. and Bender, Stephan (2016). Time-resolved neuroimaging of visual short term memory consolidation by post-perceptual attention shifts. Neuroimage, 125. S. 964 - 978. SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE. ISSN 1095-9572

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Abstract

Post-perceptual cues can enhance visual short term memory encoding even after the offset of the visual stimulus. However, both the mechanisms by which the sensory stimulus characteristics are buffered as well as the mechanisms by which post-perceptual selective attention enhances short term memory encoding remain unclear. We analyzed late post-perceptual event-related potentials (ERPs) in visual change detection tasks (100 ms stimulus duration) by high-resolution ERP analysis to elucidate these mechanisms. The effects of early and late auditory post-cues (300 ms or 850 ms after visual stimulus onset) as well as the effects of a visual interference stimulus were examined in 27 healthy right-handed adults. Focusing attention with post-perceptual cues at both latencies significantly improved memory performance, i.e. sensory stimulus characteristics were available for up to 850 ms after stimulus presentation. Passive watching of the visual stimuli without auditory cue presentation evoked a slow negative wave (N700) over occipito-temporal visual areas. N700 was strongly reduced by a visual interference stimulus which impeded memory maintenance. In contrast, contralateral delay activity (CDA) still developed in this condition after the application of auditory post-cues and was thereby dissociated from N700. CDA and N700 seem to represent two different processes involved in short term memory encoding. While N700 could reflect visual post processing by automatic attention attraction, CDA may reflect the top-down process of searching selectively for the required information through post-perceptual attention. (C) 2015 Elsevier Inc. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Hecht, Marcus UNSPECIFIED UNSPECIFIED UNSPECIFIED Thiemann, Ulf UNSPECIFIED UNSPECIFIED UNSPECIFIED Freitag, Christine M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bender, Stephan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-287250
DOI:	10.1016/j.neuroimage.2015.11.013
Journal or Publication Title:	Neuroimage
Volume:	125
Page Range:	S. 964 - 978
Date:	2016
Publisher:	ACADEMIC PRESS INC ELSEVIER SCIENCE
Place of Publication:	SAN DIEGO
ISSN:	1095-9572
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language PREDICTS INDIVIDUAL-DIFFERENCES; WORKING-MEMORY; ELECTROPHYSIOLOGICAL MEASURE; SELECTIVE ATTENTION; OBJECT SUBSTITUTION; CAPACITY; REPRESENTATIONS; STORAGE; MOVEMENT; SEARCH Multiple languages Neurosciences; Neuroimaging; Radiology, Nuclear Medicine & Medical Imaging Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28725