Sustained field response in a representative subject. A) Top view of sensor waveforms showing the average of all trials in a representative subject (A, anterior; P, posterior; L, left; R, right). B) Sensor data seen in A are superimposed. Dashed lines indicate dipole fitting interval (600 - 950 ms). Gray arrowhead shows the stimulus onset. C) Estimated dipole locations for the sustained field (SF) response overlaid on the representative subject's MRI.