Figure 4.

Cortical Thickness. Sample average thickness of cortex as calculated by dividing the number of neurons per column by the density of neurons for each sample in the study by Collins et al. Cortical thickness is seen to, on average, be reduced in posterior regions. The surfaces (in C and D) and the curves (in E and F) were calculated by dividing our respective model functions for neurons per column by those for neuron density. The arrows in (A and B) indicate the orientation of the principal axes.