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

(2011) EXPERIMENTAL BRAIN RESEARCH. 209(4). p.501-513
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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.
Keywords
INDIVIDUAL-DIFFERENCES, SHORT-TERM-MEMORY, ENCODING STRATEGIES, NEURAL SYSTEM, OBJECTS, REPRESENTATIONS, ATTENTION, STORAGE, NUMBER, CONJUNCTIONS, Electrophysiology, Short-term memory, Slow-potential, Categories

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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.
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.
Chicago author-date
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.
Chicago author-date (all authors)
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.
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.
IEEE
[1]
S. Diamantopoulou, L. Poom, P. Klaver, and D. Talsma, “Visual working memory capacity and stimulus categories: a behavioral and electrophysiological investigation,” EXPERIMENTAL BRAIN RESEARCH, vol. 209, no. 4, pp. 501–513, 2011.
@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},
  keywords     = {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},
}

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