Behavioral data and comparison of information tracking in visual cortex. (A) Behavioral lip-reading abilities. Participants recognized numbers the most, followed by words and sentences. (B) Correlation between age and lip-reading score revealed no significant correlation (P = 0.66), suggesting that lip-reading abilities do not change with age. The blue line depicts regression line, and shaded areas depict standard error of mean (SE). (C) Overlap of voxels reaching at least 90% of the maximum coherence value for the respective speech feature. Occipital areas show a strong overlap of highest coherence values over speech features. (D) Mean values extracted from all voxels in occipital cortex showing no significant differences in lip–brain coherence (P_FDR = 0.695) but showing significant differences in unheard envelope-brain coherence (P_FDR = 0.041) and unheard pitch–brain coherence (P_FDR = 0.042) and a trend for the formant–brain coherence (P_FDR = 0.095) between natural and reversed presentation of visual speech. Error bars represent 1 SE for within-subject designs (O’Brien and Cousineau 2014), and δ indicates the relative change between natural and reversed conditions in percent.