Exploring Training Effect in 42 Human Subjects Using a Non-invasive Sensorimotor Rhythm Based Online BCI

Conclusion In this study, we analyzed a pooled dataset consisting of 42 subjects’ three BCI training sessions. The behavioral performance results showed that there was a significant increase of BCI PVC accuracy (p = 0.004) and a marginal significant improvement of ITR (p = 0.05) in the third training session compared to the first session. No other significant difference of behavioral measures such as group average abort rate or feedback duration was found across the training sessions. Further analysis on the group average R2 value indicated that there was a significant difference of the R2 value on the first training session, but this difference diminished for the remaining sessions if only hit trials were considered; there was no significant difference if all of the trials were used. A significant difference of ERD/ERS values between the channel C3 and C4 was shown across the three training sessions for both left-hand and right-hand tasks, and this stronger ipsilateral ERS phenomenon explains the experimental observation of the successful control of the cursor toward the same side of hand imagination. A significant ERD lateralization was only shown in the right-hand imagination task but not in the left-hand imagination task in the group level. Neither R2 values nor ERD/ERS values showed significant change across the three training sessions for neither channel C3 n
Source: Frontiers in Human Neuroscience - Category: Neuroscience Source Type: research