Fig. 1. The CMS as used in the validation sample. Subjects draw a line from the center of the circle to the location on the periphery best representing their predominant mood at the time of recording. The angle () between the line and the horizontal that connects the center of the circle with "happy/friendly" (measured counterclockwise) represents the mood score; eg, "active/attentive" = 90°. Subjects place a second mark on the line reflecting the intensity of the mood. Intensity scores were not used in the data analyses for this report. Note: the faces of the CMS were computer-generated, with the curvature of the mouth reflecting the degree of pleasantness (cos ) and the width of the eyes and mouth reflecting the degree of engagement (sin ).