Fig 8. Habituation of the EEG components at 0.2 Hz.
(a) Effects of the stimulation temperature and surface on the AUC of the stimulus-evoked EEG component at 0.2 Hz at FCz, estimated as the sum of the noise-subtracted STFT amplitudes at Hz. The red (resp. blue) dots show the mean amplitudes for the warm (resp. cool) stimulation, the standard deviations being indicated with horizontal bars. These means and standard deviations are also reported below the plots with the corresponding color. Each asterisk in the plot indicates a significant difference across temperature according to paired samples t-tests. (b) Noise-subtracted amplitudes of the Fourier transforms at 0.2 Hz at FCz as a function of the number of periods removed at the beginning of the EEG signals. The error bars show the standard deviations across subjects, with larger caps when the surface is fixed than when it is variable. For each number of periods removed along the x-axis, a marker drawn below the plot indicates that the noise-subtracted amplitude in the associated condition (with the same color and marker) and for this abscissa is significantly different from 0, according to one-sample t-tests with Holm-Bonferroni correction.