Figure 1: A comparison of cortical response from two trials using a diffuse light flash stimulus. The upper row contains selected images from Trial 3202, while the lower row has the corresponding frames from Trial 3207. The dark center trace is the output of the diode marked by a triangle in frame E of Trial 3207. The light trace is the corresponding output for Trial 3202. The small square marks stimulus onset, and the vertical arrow shows the scale of the signal relative to the DC component.