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The higher accuracy in the left hand movement might be because this movement is more difficult to control intentionally.
The sign of PD e reflects the tendency (increase or decrease) of the BP modulation from condition L (imagination of left hand movement) to condition R (imagination of right hand movement) in channel e. Imagination of left and right hand movements usually elicit contrary contralateral dominance of ERD at channels C3 and C4 [123 23].
Indeed, it was not uncommon for the subjects to have the urge to make a slight left hand movement during the presentation of sounds.
Task and Residual methods indicate a stronger RSMA/RSMC correlation during left hand movement, which is almost mirrored by the Subject method except that the 90% CI in that case barely includes zero.
The Task and Residual methods additionally detected a greater LSMA to LSMC coefficient during right hand movement, and the Residual method detected a greater RSMA to RSMC coefficient during left hand movement.
Post-hoc contrasts revealed that when left-handers used the left hand movement duration was longer (Fig. 2c) and the amplitude of peak velocity was lower (Fig. 2d) than when the right hand was used (ps<0.05).
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The proposed criterion for finding the ROI is based on two neurophysiological principles: 1. Motor imagery of one hand typically generates ERD in the contralateral side of brain, so it is possible to discriminate between the imaginations of right and left hand movements by using bipolar electrodes placed over corresponding hand representation areas, i.e., C3 and C4 [12].
Motor imagery of one hand typically generates ERD in the contralateral side of brain, so it is possible to discriminate between the imaginations of right and left hand movements by using bipolar electrodes placed over corresponding hand representation areas, i.e., C3 and C4 [12].
During a 12-hour operation, Bakay inserted the electrodes, housed in two glass cones, into the area of Johnny's cortex that controls left-hand movement.
In this study, 13 subjects performed tasks of right-hand, right-foot or left-hand movement and motor imagery when EEG and fMRI data were separately collected.
Although a previous study suggested that left-hand movement reaction time might be shorter than that for the right hand [31], we found that the right-hand reaction time was shorter.
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