Correlation Results between FA Values and Processing Speed Variables. Figure 1.A, 1.B and 1.C show positive correlation (warm) between FA values and SDMT performance. Figure 1.B shows negative (cool) correlation between FA and RT CPT-II performance. Images are represented according to radiological convention (left corresponding to the right hemisphere). R: right, L: left, A: anterior, P: posterior, I: inferior; S: superior.