Time courses of MEG maps and waveforms. Averaged responses to index finger tactile stimulation at low rate (stimulation condition 1 in Figure 6; the strongest response was observed under this condition) were recorded from a right-handed subject. The left and right columns show responses to RD2 and LD2 stimulation, respectively. The two top (a and d) panels represent the series of contour plots of sensor data showing the time course of the averaged evoked magnetic fields. Each plot shows the sensor data interpolated between the 275 sensors at different latencies. The nasion is pointing up, the right ear is to the right, and the left ear is to the left (top view). Panels b, c, e and f show averaged evoked magnetic field responses; each line depicts an average of the data from a single sensor over all trials for one condition. Panels b and e show response waveforms recorded from half of all sensors over the hemisphere contralateral to the stimulated index finger, c and f from the hemisphere ipsilateral to the stimulated index finger.