Phase stability in the SSVEP responses
Maciej Labecki (University of Warsaw), Pawel Kordowski (University of Warsaw), Mateusz Kruszynski (University of Warsaw), Jakub Maciejewski (University of Warsaw), Rafal Kus (University of Warsaw), Piotr Suffczynski (University of Warsaw)
properties over the whole stimulation signals. This assumption may be tested in amplitude and phase domain which in principle are two independent indicators of stationary of the response signal.
Our initial results suggest that the amplitude of the subsequent responses is not constant and habituates with time. In the present study we investigated stability of phase of the SSVEP. We used EEG signal recorded during flickering stimulation. The Fourier Transform was computed and then phase of the stimulation frequency component was computed in a sliding overlaping window. Using these metods we have shown that the phase of the response signal is stabile during whole stimulation sequences and it's value is aproximately constant among trials.