Electrophysiological results in the time-frequency domain. A, Time-frequency representation of ERD/ERS (in percentage) from baseline (from −500 to −300 ms) for the frequency range 4–30 Hz and the time interval between −0.5 and 0.5 s for the 1PP high embodiment and the 3PP low embodiment and for correct and incorrect avatar's grasps at FCz electrode. Data from the entire sample of 20 participants are included. The value 0 on the x-axis indicates the instant occurrence of the error. It is worth noting that the effect is much stronger, earlier, and longer-lasting for theta than for alpha oscillations. B, Topographical distribution of the ERD/ERS from baseline of theta (4–8 Hz, left) and alpha (8–12 Hz, right) band. Error-related activity is estimated as subtraction of 1PP incorrect − correct and 3PP incorrect − correct, in the time window between 0 and 400 ms.