ИСТИНА

INTRODUCTION. It is well known that time-locked EEG measures can reflect certain cortical processes e.g. selective attention. In GO/NOGO paradigm tasks,such parameters as P3 and N2 amplitudes reflect execution and inhibition of a motor response [1].Also,it can be effectively used in BCI applications[2].In our work we studied the relationships between components of visual ERPs during motor learning task. MATERIALS AND METHODS. The study involved 9 volunteers, which had to play two musical patterns on the piano. Each pattern consisted of 10 consecutive notes in the 1 octave range. Target notes were highlighted in red on the computer monitor. Experimental pattern contained additional green highlights as distractors (50% target+distr.),but the second pattern (reference) contained only target highlights. Participants should play notes on a midi-keyboard according to highlighted red-ones on the screen and ignore green keys.Each pattern was presented 10 times in a random sequence.28-channel EEG was recorded during the learning task in accordance with the “10-10” system. RESULTS. We have found statistically significant changes (p<0.05, Friedman statistics+post-hoc) in N2&P3 components. N2 was maximal in target+distr.trials. Target trials of experimental patterns showed stronger P3 amplitudes in opposite to target+distr. and reference trials. Also,we investigated motor reaction rate,that was significantly lower in target+distr.trials. CONCLUSION. Overall, our data indicate associations of the N2 and P3 with visual attention and inhibition/execution of motion. They support the previous findings [3] and confirm the hypothesis that the ratio of N2 and P3 component can be used as attention and motor performance correlate and be implemented in bci contours during motor learning tasks.