Fig. 2.

Illustration of laterality curves and associated metrics. A: LI curves obtained from the IF (Broca) ROI on the PR task are shown for all 12 control participants (thin red lines), one of whom is right hemisphere dominant (negative LI values). LI curves are plotted here, and throughout, as a function of active brain volume (cm³, N active voxels multiplied by voxel volume). The grey shaded region at left indicates the initial portion of the curves that lies outside of the valid LI range (see Materials and Methods). The LI curve for one participant is highlighted (heavy red line) for the purposes of illustrating the LI metric used throughout this paper. B: group mean laterality curve and associated confidence interval, derived from the data shown in A.