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dc.contributor.authorHuang, Ruey-Songen_US
dc.contributor.authorJung, Tzyy-Pingen_US
dc.contributor.authorDelorme, Amauden_US
dc.contributor.authorMakeig, Scotten_US
dc.date.accessioned2014-12-08T15:12:35Z-
dc.date.available2014-12-08T15:12:35Z-
dc.date.issued2008-02-15en_US
dc.identifier.issn1053-8119en_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.neuroimage.2007.10.036en_US
dc.identifier.urihttp://hdl.handle.net/11536/9670-
dc.description.abstractTonic and phasic dynamics of electroencephalographic (EEG) activities during a continuous compensatory tracking task (CTT) were analyzed using time-frequency analysis of EEG sources identified by independent component analysis (ICA). In I-hour sessions, 70-channel EEG data were recorded while participants attempted to use frequent compensatory trackball movements to maintain a drifting disc close to a bulls-eye at screen center. Disc trajectories were converted into two moving-average performance measures, root mean square distance of the disc from screen center in 4-s ('local') and in 20-s ('global') moving time windows. Maximally independent EEG processes and their equivalent dipole source locations were obtained using the EEGLAB toolbox (http://sccn.ucsd.edu/eeglab). Across subjects and sessions, independent EEG processes in occipital, somatomotor, and supplementary motor cortices exhibited tonic power increases during periods of high tracking error, plus additional phasic power increases in several frequency bands before and after trackball movements following disc 'perigees' (moments at which the disc began to drift away from the bulls-eye). These phasic activity increases, which were larger during high-error periods, reveal an intimate relation between EEG dynamics and top-down recognition of responding to threatening events. Thus during a continuous tracking task without impulsive stimulus onsets, sub-second scale EEG dynamics related to visuomotor task could be dissociated from slower spectral modulations linked to changes in performance and arousal. We tentatively interpret the observed EEG signal increases as indexing tonic and phasic modulations of the levels of task attention and engagement required to maintain visuomotor performance during sustained performance. (c) 2007 Elsevier Inc. All rights reserved.en_US
dc.language.isoen_USen_US
dc.subjectEEGen_US
dc.subjectindependent component analysisen_US
dc.subjectevent-related brain dynamicsen_US
dc.subjectvisuomotor trackingen_US
dc.subjecttonic and phasic activitiesen_US
dc.titleTonic and phasic electroencephalographic dynamics during continuous compensatory trackingen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.neuroimage.2007.10.036en_US
dc.identifier.journalNEUROIMAGEen_US
dc.citation.volume39en_US
dc.citation.issue4en_US
dc.citation.spage1896en_US
dc.citation.epage1909en_US
dc.contributor.department腦科學研究中心zh_TW
dc.contributor.departmentBrain Research Centeren_US
dc.identifier.wosnumberWOS:000253241800039-
dc.citation.woscount35-
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