Appendix 1—figure 1. Social communication, cognitive, and language abilities in children with ASD with low vs. high mother’s voice identification accuracy.

(A) To examine whether children with ASD who were unable to identify their mother’s voice in the mother’s voice identification task (N = 5) showed a distinct behavioral profile relative to children with ASD who were able to perform this task (N = 16), we performed Wilcoxon rank sum tests using ADOS Social Affect scores (left-most violin plot) and standardized measures of IQ (Wechsler Abbreviated Scale of Intelligence (Wechsler, 1999)) between these groups. Group comparisons between low (green) and high (blue) mother’s voice identification groups using Wilcoxon rank sum tests were not significant for social communication (p = 0.83) or IQ measures (p > 0.25 for all three measures, uncorrected for multiple comparisons). (B) To examine group differences in language abilities for low vs. high mother’s voice identification groups, we performed Wilcoxon rank sum tests using CTOPP Phonological Awareness and CELF Language measures. Group comparison were not significant for any of the language measures (p > 0.05 for all four measures, not corrected for multiple comparisons), however there was a trend for reduced Core Language (p = 0.062) and Expressive Language abilities (p = 0.055) in the low (green) mother’s voice identification group.