Partial dissociation in the neural bases of VSTM and imagery in the early visual cortex

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Saad , E , Wojciechowska , M & Silvanto , J 2015 , ' Partial dissociation in the neural bases of VSTM and imagery in the early visual cortex ' , Neuropsychologia , vol. 75 , pp. 143-148 .

Title: Partial dissociation in the neural bases of VSTM and imagery in the early visual cortex
Author: Saad, Elyana; Wojciechowska, Maria; Silvanto, Juha
Contributor organization: BioMag Laboratory
Behavioural Sciences
Date: 2015-08
Language: eng
Number of pages: 6
Belongs to series: Neuropsychologia
ISSN: 0028-3932
Abstract: Visual short-term memory (VSTM) and visual imagery are believed to involve overlapping neuronal representations in the early visual cortex. While a number of studies have provided evidence for this overlap, at the behavioral level VSTM and imagery are dissociable processes; this begs the question of how their neuronal mechanisms differ. Here we used transcranial magnetic stimulation (TMS) to examine whether the neural bases of imagery and VSTM maintenance are dissociable in the early visual cortex (EVC). We intentionally used a similar task for VSTM and imagery in order to equate their assessment. We hypothesized that any differential effect of TMS on VSTM and imagery would indicate that their neuronal bases differ at the level of EVC. In the "alone" condition, participants were asked to engage either in VSTM or imagery, whereas in the "concurrent" condition, each trial required both VSTM maintenance and imagery simultaneously. A dissociation between VSTM and imagery was observed for reaction times: TMS slowed down responses for VSTM but not for imagery. The impact of TMS on sensitivity did not differ between VSTM and imagery, but did depend on whether the tasks were carried concurrently or alone. This study shows that neural processes associated with VSTM and imagery in the early visual cortex can be partially dissociated. (C) 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (
Subject: VSTM
Visual imagery
Early visual cortex
515 Psychology
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: publishedVersion

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