Fig. 7
From: The challenge of controlling an auditory BCI in the case of severe motor disability
Effect of attention on averaged evoked related potentials (ERPs) to sounds “yes” in patient ALS3 and ALS4. Mean ERPs for attended and unattended sounds, standards (a) and deviants (b). The SOA is at 400 ms, with an alternance of ATTENDED (Att) and IGNORED (Ign) sounds, hence a switch in the attentional modulation every 400 ms. Each stimulus onset is represented by a vertical dashed line. The solid curve depicts the response when the first stimulus is attended, while the dashed curve depicts the responses when the first stimulus is ignored. The shaded area corresponds to the period when this difference is significant. This analysis was performed on the preprocessed signals using ICA. TFCE: Threshold-free cluster enhancement test for the difference between attended and ignored sounds. Each line represents one electrode. When significant, the clusters for one electrode appear in white (negative) or in gray (positive)