Movement imagery-related lateralization of event-related (de)synchronization (ERD/ERS): motor-imagery duration effects.
OBJECTIVE
To investigate movement imagery-related lateralization of event-related (de)synchronization (ERD/ERS) during two motor-imagery tasks with varying movement duration (brief versus continuous).


METHODS
Twelve subjects performed or kinesthetically imagined the indicated movement (left or right hand movement) for 1 s (brief) or 5 s (continuous) while electroencephalograms (EEGs) were recorded using 16 electrodes covering the sensorimotor cortex of the brain according to the modified 10-20 system.


RESULTS
Significant hemispheric differences were found between contralateral and ipsilateral area in mu ERD, mu ERS and beta ERD during both brief and continuous conditions, showing contralateral dominance of mu and beta ERD and ipsilateral dominance of mu ERS. Beta ERS showed a significant ipsilateral dominance only in the brief condition. Movement imagery duration influenced the lateralization of mu ERD, beta ERD, and beta ERS, but not mu ERS.


CONCLUSIONS
The results of this study will aid in clarifying movement-related lateralization in association with imagery tasks under varying movement duration.


CONCLUSIONS
For designing an EEG-based brain-computer interface (BCI) for people with severe neuromuscular impairments, movement imagery-related lateralization can play a key role in utilizing motor-imagery tasks as a control or communication strategy.
Nam
Chang S
CS
Department of Industrial Engineering, University of Arkansas, Fayetteville, AR 72701, USA. Electronic address: cnam@uark.edu.
Jeon
Yongwoong
Y
Department of Industrial Engineering, University of Arkansas, Fayetteville, AR 72701, USA. Electronic address: yjeon@uark.edu.
Kim
Young-Joo
YJ
Department of Industrial Engineering, University of Arkansas, Fayetteville, AR 72701, USA. Electronic address: yxk008@uark.edu.
Lee
Insuk
I
Department of Business Administration, Sogang University, Seoul, Republic of Korea. Electronic address: insuklee@sogang.ac.kr.
Park
Kyungkyu
K
Department of Business Administration, Sogang University, Seoul, Republic of Korea. Electronic address: kyungkyu@sogang.ac.kr.
D000465:Algorithms; D001611:Beta Rhythm / Q000502:physiology; D003344:Cortical Synchronization; D003627:Data Interpretation, Statistical; D004292:Dominance, Cerebral / Q000502:physiology; D004569:Electroencephalography; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006225:Hand / Q000294:innervation / Q000502:physiology; D006801:Humans; D007092:Imagination / Q000502:physiology*; D008297:Male; D009068:Movement / Q000502:physiology*; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology; D013003:Somatosensory Cortex / Q000502:physiology; D055815:Young Adult