Linguistic camouflage in girls with autism spectrum disorder

• Published in: Molecular autism 2017-09, Vol.8 (1), p.48-48, Article 48
• Main Authors: Parish-Morris, Julia, Liberman, Mark Y, Cieri, Christopher, Herrington, John D, Yerys, Benjamin E, Bateman, Leila, Donaher, Joseph, Ferguson, Emily, Pandey, Juhi, Schultz, Robert T
• Format: Article
• Language: English
• Subjects: Adolescent; Autism; Autism Spectrum Disorder - diagnosis; Autism Spectrum Disorder - psychology; Behavior; Boys; Child; Children & youth; Communication; Complications and side effects; Demographic aspects; Diagnosis; Disfluency; Female; Females; Gender differences; Generations; Girls; Humans; Language; Linguistic camouflage; Male; Pervasive developmental disorders; Pragmatic communication; Psycholinguistics; Psychological aspects; Sensitivity and Specificity; Sex differences; Sex differences (Biology); Sex Factors; Social aspects; Social Behavior; Studies; Verbal Behavior; Verbal communication
• ISSN: 2040-2392; 2040-2392
• DOI: 10.1186/s13229-017-0164-6

Autism spectrum disorder (ASD) is diagnosed more frequently in boys than girls, even when girls are equally symptomatic. Cutting-edge behavioral imaging has detected "camouflaging" in girls with ASD, wherein social behaviors appear superficially typical, complicating diagnosis. The present study explores a new kind of camouflage based on language differences. Pauses during conversation can be filled with words like UM or UH, but research suggests that these two words are pragmatically distinct (e.g., UM is used to signal longer pauses, and may correlate with greater social communicative sophistication than UH). Large-scale research suggests that women and younger people produce higher rates of UM during conversational pauses than do men and older people, who produce relatively more UH. Although it has been argued that children and adolescents with ASD use UM less often than typical peers, prior research has not included sufficient numbers of girls to examine whether sex explains this effect. Here, we explore UM vs. UH in school-aged boys and girls with ASD, and ask whether filled pauses relate to dimensional measures of autism symptom severity. Sixty-five verbal school-aged participants with ASD (49 boys, 16 girls, IQ estimates in the average range) participated, along with a small comparison group of typically developing children (8 boys, 9 girls). Speech samples from the Autism Diagnostic Observation Schedule were orthographically transcribed and time-aligned, with filled pauses marked. Parents completed the Social Communication Questionnaire and the Vineland Adaptive Behavior Scales. Girls used UH less often than boys across both diagnostic groups. UH suppression resulted in higher UM ratios for girls than boys, and overall filled pause rates were higher for typical children than for children with ASD. Higher UM ratios correlated with better socialization in boys with ASD, but this effect was driven by increased use of UH by boys with greater symptoms. Pragmatic language markers distinguish girls and boys with ASD, mirroring sex differences in the general population. One implication of this finding is that typical-sounding disfluency patterns (i.e., reduced relative UH production leading to higher UM ratios) may normalize the way girls with ASD sound relative to other children, serving as "linguistic camouflage" for a naïve listener and distinguishing them from boys with ASD. This first-of-its-kind study highlights the importance of continued commitment