Fig. 5.

Processing of the standard tone contrasted between Pitch and Duration discrimination tasks. A. Auditory evoked responses elicited by the presentation of the standard tone. The top panels show the normed evoked responses from the paired gradiometers, the bottom panels show the average evoked responses measured by magnetometers. The left panels show responses for the TDC group and the right panels show responses for the ASD group. The topography at the top right corner of each panel illustrates the significant cluster of sensors across which the average evoked responses were obtained. Coloured traces depict the time course of the brain responses evoked by the presentation of the standard tone in the Pitch task (black) and the Duration task (red). The difference in auditory evoked responses are plotted in green. The shadowed areas represent 2 standard deviations of the mean time course for each task. Temporal intervals showing a significant difference between groups for the cluster of sensors are denoted by a red bar along the x axis. B. Topographies of the auditory responses evoked by the presentation of the standard tone in clusters showing significant differences across experimental tasks. The top panel illustrates the topographies for gradiometers (dx are derivative along the latitude; dy are derivative along the longitude), the bottom panel shows the topographies for magnetometers. The right column of sensors shows the difference in the evoked response between the two tasks. Significantly clusters are denoted by x (p < 0.05) or * (p < 0.01).