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Visual working memory capacity and stimulus categories: a behavioral and electrophysiological investigation

Sofia Diamantopoulou, Leo Poom, Peter Klaver and Durk Talsma UGent (2011) EXPERIMENTAL BRAIN RESEARCH. 209(4). p.501-513
abstract
It has recently been suggested that visual working memory capacity may vary depending on the type of material that has to be memorized. Here, we use a delayed match-to-sample paradigm and event-related potentials (ERP) to investigate the neural correlates that are linked to these changes in capacity. A variable number of stimuli (1-4) were presented in each visual hemifield. Participants were required to selectively memorize the stimuli presented in one hemifield. Following memorization, a test stimulus was presented that had to be matched against the memorized item(s). Two types of stimuli were used: one set consisting of discretely different objects (discrete stimuli) and one set consisting of more continuous variations along a single dimension (continuous stimuli). Behavioral results indicate that memory capacity was much larger for the discrete stimuli, when compared with the continuous stimuli. This behavioral effect correlated with an increase in a contralateral negative slow wave ERP component that is known to be involved in memorization. We therefore conclude that the larger working memory capacity for discrete stimuli can be directly related to an increase in activity in visual areas and propose that this increase in visual activity is due to interactions with other, non-visual representations.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
INDIVIDUAL-DIFFERENCES, SHORT-TERM-MEMORY, ENCODING STRATEGIES, NEURAL SYSTEM, OBJECTS, REPRESENTATIONS, ATTENTION, STORAGE, NUMBER, CONJUNCTIONS, Electrophysiology, Short-term memory, Slow-potential, Categories
journal title
EXPERIMENTAL BRAIN RESEARCH
Exp. Brain Res.
volume
209
issue
4
pages
501 - 513
Web of Science type
Article
Web of Science id
000288253300004
JCR category
NEUROSCIENCES
JCR impact factor
2.395 (2011)
JCR rank
147/242 (2011)
JCR quartile
3 (2011)
ISSN
0014-4819
DOI
10.1007/s00221-011-2536-z
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1936237
handle
http://hdl.handle.net/1854/LU-1936237
date created
2011-10-27 11:21:30
date last changed
2011-10-27 14:59:16
@article{1936237,
  abstract     = {It has recently been suggested that visual working memory capacity may vary depending on the type of material that has to be memorized. Here, we use a delayed match-to-sample paradigm and event-related potentials (ERP) to investigate the neural correlates that are linked to these changes in capacity. A variable number of stimuli (1-4) were presented in each visual hemifield. Participants were required to selectively memorize the stimuli presented in one hemifield. Following memorization, a test stimulus was presented that had to be matched against the memorized item(s). Two types of stimuli were used: one set consisting of discretely different objects (discrete stimuli) and one set consisting of more continuous variations along a single dimension (continuous stimuli). Behavioral results indicate that memory capacity was much larger for the discrete stimuli, when compared with the continuous stimuli. This behavioral effect correlated with an increase in a contralateral negative slow wave ERP component that is known to be involved in memorization. We therefore conclude that the larger working memory capacity for discrete stimuli can be directly related to an increase in activity in visual areas and propose that this increase in visual activity is due to interactions with other, non-visual representations.},
  author       = {Diamantopoulou, Sofia and Poom, Leo and Klaver, Peter and Talsma, Durk},
  issn         = {0014-4819},
  journal      = {EXPERIMENTAL BRAIN RESEARCH},
  keyword      = {INDIVIDUAL-DIFFERENCES,SHORT-TERM-MEMORY,ENCODING STRATEGIES,NEURAL SYSTEM,OBJECTS,REPRESENTATIONS,ATTENTION,STORAGE,NUMBER,CONJUNCTIONS,Electrophysiology,Short-term memory,Slow-potential,Categories},
  language     = {eng},
  number       = {4},
  pages        = {501--513},
  title        = {Visual working memory capacity and stimulus categories: a behavioral and electrophysiological investigation},
  url          = {http://dx.doi.org/10.1007/s00221-011-2536-z},
  volume       = {209},
  year         = {2011},
}

Chicago
Diamantopoulou, Sofia, Leo Poom, Peter Klaver, and Durk Talsma. 2011. “Visual Working Memory Capacity and Stimulus Categories: a Behavioral and Electrophysiological Investigation.” Experimental Brain Research 209 (4): 501–513.
APA
Diamantopoulou, S., Poom, L., Klaver, P., & Talsma, D. (2011). Visual working memory capacity and stimulus categories: a behavioral and electrophysiological investigation. EXPERIMENTAL BRAIN RESEARCH, 209(4), 501–513.
Vancouver
1.
Diamantopoulou S, Poom L, Klaver P, Talsma D. Visual working memory capacity and stimulus categories: a behavioral and electrophysiological investigation. EXPERIMENTAL BRAIN RESEARCH. 2011;209(4):501–13.
MLA
Diamantopoulou, Sofia, Leo Poom, Peter Klaver, et al. “Visual Working Memory Capacity and Stimulus Categories: a Behavioral and Electrophysiological Investigation.” EXPERIMENTAL BRAIN RESEARCH 209.4 (2011): 501–513. Print.