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Individual differences in oscillatory brain activity in response to varying attentional demands during a word recall and oculomotor dual task

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Title
Individual differences in oscillatory brain activity in response to varying attentional demands during a word recall and oculomotor dual task
Author(s)
Gusang Kwon; Lim, Sanghyun; Kim, Min-Young; Kwon, Hyukchan; Lee, Yong-Ho; Kim, Kiwoong; Lee, Eun-Ju; Minah Suh
Publication Date
2015-06
Journal
FRONTIERS IN HUMAN NEUROSCIENCE, v.9, no.JUNE, pp.381 -
Publisher
FRONTIERS RES FOUND
Abstract
Every day, we face situations that involve multi-tasking. How our brain utilizes cortical resources during multi-tasking is one of many interesting research topics. In this study, we tested whether a dual-task can be differentiated in the neural and behavioral responses of healthy subjects with varying degree of working memory capacity (WMC). We combined word recall and oculomotor tasks because they incorporate common neural networks including the fronto-parietal (FP) network. Three different types of oculomotor tasks (eye fixation; Fix-EM, predictive & random smooth pursuit eye movement; P-SPEM & R-SPEM) were combined with two memory load levels (low-load: 5 words, high-load: 10 words) for a word recall task. Each of those dual-task combinations was supposed to create varying cognitive loads on the FP network. We hypothesize that each dual-task requires different cognitive strategies for allocating the brain’s limited cortical resources and affects brain oscillation of the FP network. In addition, we hypothesized that groups with different WMC will show differential neural and behavioral responses. We measured oscillatory brain activity with simultaneous MEG and EEG recordings and behavioral performance by word recall. Prominent frontal midline (FM) theta (4-6 Hz) synchronization emerged in the EEG of the high-WMC group experiencing R-SPEM with high-load conditions during the early phase of the word maintenance period. Conversely, significant parietal upper alpha (10-12 Hz) desynchronization was observed in the EEG and MEG of the low-WMC group experiencing P-SPEM under high-load conditions during the same period. Different brain oscillatory patterns seem to depend on each individual’s WMC and varying attentional demands from different dual-task combinations. These findings suggest that specific brain oscillations may reflect different strategies for allocating cortical resources during combined word recall and oculomotor dual-tasks.
URI
http://pr.ibs.re.kr/handle/8788114/1722
DOI
10.3389/fnhum.2015.00381
ISSN
1662-5161
Appears in Collections:
Center for Neuroscience Imaging Research (뇌과학 이미징 연구단) > Journal Papers (저널논문)
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