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Dissociable mechanisms underlying individual differences in visual working memory capacity.

Abstract：

:Individuals scoring relatively high on measures of working memory tend to be more proficient at controlling attention to minimize the effect of distracting information. It is currently unknown whether such superior attention control abilities are mediated by stronger suppression of irrelevant information, enhancement of relevant information, or both. Here we used steady-state visual evoked potentials (SSVEPs) with the Eriksen flanker task to track simultaneously the attention to relevant and irrelevant information by tagging target and distractors with different frequencies. This design allowed us to dissociate attentional biasing of perceptual processing (via SSVEPs) and stimulus processing in the frontal cognitive control network (via time-frequency analyses of EEG data). We show that while preparing for the upcoming stimulus, high- and low-WMC individuals use different strategies: High-WMC individuals show attentional suppression of the irrelevant stimuli, whereas low-WMC individuals demonstrate attentional enhancement of the relevant stimuli. Moreover, behavioral performance was predicted by trial-to-trial fluctuations in strength of distractor-suppression for high-WMC participants. We found no evidence for WMC-related differences in cognitive control network functioning, as measured by midfrontal theta-band power. Taken together, these findings suggest that early suppression of irrelevant information is a key underlying neural mechanism by which superior attention control abilities are implemented.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Gulbinaite R,Johnson A,de Jong R,Morey CC,van Rijn H

doi

10.1016/j.neuroimage.2014.05.060

subject

Has Abstract

pub_date

2014-10-01 00:00:00

pages

197-206

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(14)00425-X

journal_volume

99

pub_type

杂志文章

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