Grand average waveforms and global field power for the orientation-defined form response.

<p>Prominent responses are present to the both the appearance (left) and disappearance (right) of the orientation-defined figure. Responses are larger and more protracted following the onset of the figure region than the return to a uniform state. Curved arrows to the left and right of the waveforms indicate that this is the response to a periodic stimulus. The grey shading around the Global Field Power trace indicates +/−1 standard error of measurement for the mean GFP.