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| 題名: | Transcranial direct current stimulation over right posterior parietal cortex changes prestimulus alpha oscillation in visual short-term memory task |
| 作者: | 徐慈妤;Hsu, Tzu-Yu;Tseng, Philip;Liang, Wei-Kuang;Cheng, Shih-Kuen;Juan, Chi-Hung |
| 貢獻者: | 生醫理工學院認知神經科學研究所 |
| 關鍵詞: | Adult;Alpha Rhythm - physiology;Attention - physiology;Brain;Electroencephalography;Female;Humans;Male;Memory, Short-Term - physiology;Parietal Lobe - physiology;Photic Stimulation;Studies;Transcranial Direct Current Stimulation;Visual Perception - physiology;Young Adult |
| 日期: | 2014-01-01 |
| 上傳時間: | 2026-04-23 14:46:49 (UTC+8) |
| 出版者: | United States: Elsevier Inc |
| 摘要: | 摘要： Alpha band activity changes accompanied with the level attentional state, and recent studies suggest that such oscillation is associated with activities in the posterior parietal cortex. Here we show that artificially elevating parietal activity via positively-charged electric current through the skull can rapidly and effortlessly change people's prestimulus alpha power and improve subsequent performance on a visual short-term memory (VSTM) task. This modulation of alpha power and behavioral performance, however, is dependent on people's natural VSTM capability such that only the low performers benefitted from the stimulation, whereas high performers did not. This behavioral dichotomy is accounted by prestimulus alpha powers around the parieto-occipital regions: low performers showed decreased prestimulus alpha power, suggesting improvement in attention deployment in the current paradigm, whereas the high performers did not benefit from tDCS as they showed equally-low prestimulus alpha power before and after the stimulation. Together, these results suggest that prestimulus alpha power, especially in low performers, can be modulated by anodal stimulation and alter subsequent VSTM performance/capacity. Thus, measuring alpha before stimulus onset may be as important as measuring other VSTM-related electrophysiological components such as attentional allocation and memory capacity related components (i.e. N2 posterior-contralateral, N2pc, or contralateral delay activity, CDA). In addition, low VSTM performers perhaps do not suffer not only from poor VSTM capacity, but also from broad attentional mechanisms, and prestimulus alpha may be an useful tool in understanding the nature of individual differences in VSTM. •Using transcranial direct current stimulation (tDCS) to investigate the prestimulus alpha oscillations in VSTM.•Anodal tDCS decreased prestimulus alpha power during the prestimulus period and increased the following VSTM performance on low VSTM performers.•The first demonstration that anodal stimulation can alter prestimulus alpha power in VSTM task.•Providing further understanding of the neural basis of alpha oscillation in attention and VSTM.
其他題名： Neuroimage
出版者： United States: Elsevier Inc
出版日期： 2014-09-01
出處： NeuroImage, 2014-09, Vol.98, p.306-313
版權： 2014 Elsevier Inc.
版權： Copyright © 2014 Elsevier Inc. All rights reserved.
版權： Copyright Elsevier Limited Sep 1, 2014
識別號： ISSN: 1053-8119
識別號： ISSN: 1095-9572
識別號： EISSN: 1095-9572
識別號： DOI: 10.1016/j.neuroimage.2014.04.069
識別號： PMID: 24807400 |
| 顯示於類別: | [認知與神經科學研究所 ] 期刊論文
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