Fig. 3. Group average responses for all sounds–silence. Activation t maps overlaid over average anatomical image in standard stereotaxic space. The right side of the images corresponds to the subjects' right side. Line diagrams show mean ± SE of signal magnitude (difference in effect size between the two conditions, i.e. , sound vs. silence) in volume of interest centered on selected voxels (x, y, z coordinates indicated above graph). The y and z values on the far right are the Talairach coordinates of the slices; t values are revealed by color scale ;values above upper limit are shown in white .ANES = anesthesia; BASE = baseline; BOLD = blood oxygen dependent level; HG = Heschl gyrus; PT = planum temporale; RECO = recovery; SEDA = sedation.