Statistical analysis
Group averages and standard deviation for FA and MD values were calculated and plotted for the corticospinal fiber tracts and thalamic radiations using the AFQ_plot function in Matlab. For comparison, FA and MD group averages are shown for two non-motor tracts, the left and right uncinates, and the left and right cingulum hippocampus. Multiple t-tests were performed on the data to determine group differences and can be visually interpreted in Figure 5 for the corticospinal tracts and Figure 10 for the thalamic radiations. The figures show bands in areas along the tract where there were differences. The alpha was adjusted to account for multiple comparisons.