Figure 3
Examples of (A) Sensorimotor, (B) Motor, (C) Sensory, and (D) Unspecified ICs. The exact procedure of grouping of all ICs into the four groups is described below. The round component scalp maps on the left side represent topography of ICs from 64-channel EEG recordings. The component scalp map values returned by ICA were proportional to µV (scaling is distributed between the component maps and activity time courses)26, 33. Panels on the right side of each scalp map depict activity data of the IC. (1) The “top-left” plot in each panel shows colour-coded amplitude of the IC activity in a recording session. Each line in the plot represents a trial. Trials were sorted according to latency of reaction time. The black vertical line (OX = 0 ms) shows the onsets of the stimuli and the black curve in the positive direction shows the moments of a button-press event. (2) The “top-right” plot in each panel depicts the same trials as the “top-left” plot, but this time trials were aligned by onset of a button-press event (OX = 0 ms). The straight vertical line shows the moments of the button-press events and the curve in the negative direction shows the onsets of the stimuli. (3) The “middle-left” and (4) “middle-right” plots in each panel show Event Related Potentials (blue curves) derived from trials depicted in the plots above (“top-left” and “top-right”). (5) The “bottom-left” plot in each panel shows inter-trial coherence (ITC) of trials from the “top-left” plot. The black dashed rectangle represents the time-frequency window of 100 ms to 300 ms by 3 Hz to 15 Hz. The maximum value of ITC in this time-frequency window represents Sensory ITC value of the IC. (6) The “bottom-right” plots in each panel show ITC of trials from the “top-right” plot. The black dashed rectangle represents the time-frequency window of −100 ms to 100 ms by 3 Hz to 15 Hz. The maximum value of ITC in this time-frequency window represents a Motor ITC value of the IC.
