Figure 2A–CPlanum Temporale. (A) A reconstructed 3D whole brain volume viewed from the left side. The lateral surface of the STG, along the outline of the contours of the SF and superior temporal sulcus is outlined in white. The posterior boundary of the STG was established as a vertical line at the bifurcation of the SF, this was used as the posterior boundary of the PT. (B) This figure shows three sequential slices in the transverse plane as displayed in Analyze. The middle slice was selected as showing the clearest definition of Heschl’s sulcus. The white line seen in the two smaller axial slices is the tracing upon the lateral surface of the STG completed in the previous procedure. The end of this line indicates the posterior border. The middle (larger) slice shows a white triangular border which is the tracing along Heschl’s sulcus from the insula (medial border) around the lateral edge to the posterior border. At this point an automatic procedure joins the medial and posterior border. (C) This figure shows two coronal slices. The first slice displays the medial and lateral boundary lines indicated as white dots marked by arrows. The second slice determined where the two markers were furthest apart. A line was then drawn along the PT surface and continued around the PT grey matter depth on each slice. This was completed in both forward (to the anterior border) and backward (to the posterior border) directions from these two furthest markers, until the entire PT was segmented.