Discrimination rates for face only (X-axis) vs face-brain (Y-axis) for A) corpus callosum and B) the caudate nucleus (whole). Midline facial structures (nose, lip vermillion, profile and philtrum) are labelled with unfilled symbols, and non-midline structures (full face, eyes, malar and mandible) by filled symbols. Compared to single model representations of face and brain, classification accuracy is increased when combining the corpus callosum with midline facial regions (nose (1.0), lip vermillion (0.90), philtrum (0.98)) but remains unchanged for profile (0.90). Combining the caudate nucleus with facial regions improved classification for lip vermillion (0.90) but not the mandible (0.90) or philtrum (0.98). All other face regions (eyes, mandible, profile, malar and nose) gave inferior classification results when combined with brain components.