<p>A - Top, Inter-lip distance and the auditory envelope for a single 20 second segment from a single subject in the X-ray database as a function of time. X –axes depict time in seconds. Y–axes on the left depict the distance between the lower and upper lip in millimeters. Y-axes on the right depict the power in the wideband envelope. Bottom, shows a zoomed in portion of the 8–12 second time segment of the same data shown in A. Clear correspondences are present between the inter-lip distance and the auditory envelope. B - Scatter plot of the envelope power and inter lip distance along with the corresponding regression line. Each red circle denotes a single point in the speech time series. Black line denotes the linear regression between the inter-lip distance and the envelope power. Correlation coefficient between auditory and visual components for this sentence was 0.49 (p<0.0001). C - Average rank ordered intact correlations (red bars) and shuffled correlations (green bars) for the 15 subjects analyzed in the Wisconsin×ray database. X-axes depict subject number; Y- axes depict the correlations. Intact correlations for each subject were the average across all speech segments analyzed for that subject. Error bars denote standard error of the mean. Shuffled correlations were computed as an average correlation between all non-paired auditory envelopes and the inter-lip distance for each subject.</p
