Source waveforms elicited by left ear stimulation. Grand averages of source space projection waveforms for left ear stimulation. The upper graphs show the responses to the PB. The lower graphs show the responses to SB. Left and right graphs denote the responses from left and right hemisphere. The responses elicited by different conditions are represented by different colored lines (see box in the right lower corner). The insets show the peaks of the N1m responses for the contra-lateral and the control condition on an enlarged time scale around a latency of 0.1 s. As the N1m responses during ipsi-lateral masking were small and delayed, they are not shown in the insets.