Fig. 1.

A: mouth pressure with paired inspiratory occlusions (S1 and S2) for an individual subject. Both occlusions occurred within a single inspiratory cycle. Ordinate is the Pm change (in cmH₂O), and abscissa is the time course (in s). B: the averaged respiratory-related evoked potentials (RREPs) elicited with paired occlusions for an individual subject. The interstimulus interval (ISI) was 500 ms. The Nf peaks are presented in the F₃ and F₄ channels, the N1 peak is presented in the C_z channel, and the P1 peaks are presented in the C₃′ and C₄′ channels. The bottom trace is the averaged Pm. C: the averaged mouth-evoked potential (MEP) trace elicited by paired air puff stimulation to the bilateral buccal surface of the cheeks. The P50 peak was presented in the C₃′ and C₄′ channels, and the N100 peak was identified in the C_z channel. The bottom trace is the trigger channel used as the reference for measuring the peak latencies. D: the averaged somatosensory-evoked potential (SEP) trace elicited by paired air puff stimulation to the right dorsal hand. The P50 peak was represented contralaterally in the C₃′ channel, and the N100 peak was identified at the C_z channel. The bottom trace is the trigger channel used as the reference for measuring the peak latencies.