Abstract
Individuals with autism spectrum disorder (ASD) often exhibit atypical imitation. However, few studies have identified clear quantitative characteristics of vocal imitation in ASD. This study investigated imitation of speech and song in English-speaking individuals with and without ASD and its modulation by age. Participants consisted of 25 autistic children and 19 autistic adults, who were compared to 25 children and 19 adults with typical development matched on age, gender, musical training, and cognitive abilities. The task required participants to imitate speech and song stimuli with varying pitch and duration patterns. Acoustic analyses of the imitation performance suggested that individuals with ASD were worse than controls on absolute pitch and duration matching for both speech and song imitation, although they performed as well as controls on relative pitch and duration matching. Furthermore, the two groups produced similar numbers of pitch contour, pitch interval-, and time errors. Across both groups, sung pitch was imitated more accurately than spoken pitch, whereas spoken duration was imitated more accurately than sung duration. Children imitated spoken pitch more accurately than adults when it came to speech stimuli, whereas age showed no significant relationship to song imitation. These results reveal a vocal imitation deficit across speech and music domains in ASD that is specific to absolute pitch and duration matching. This finding provides evidence for shared mechanisms between speech and song imitation, which involves independent implementation of relative versus absolute features. LAY SUMMARY: Individuals with autism spectrum disorder (ASD) often exhibit atypical imitation of actions and gestures. Characteristics of vocal imitation in ASD remain unclear. By comparing speech and song imitation, this study shows that individuals with ASD have a vocal imitative deficit that is specific to absolute pitch and duration matching, while performing as well as controls on relative pitch and duration matching, across speech and music domains.
Highlights
Imitation is a fundamental skill that emerges early in typical human development (Meltzoff, 2017)
These results reveal a vocal imitation deficit across speech and music domains in autism spectrum disorder (ASD) that is specific to absolute pitch and duration matching
By comparing speech and song imitation, this study shows that individuals with ASD have a vocal imitative deficit that is specific to absolute pitch and duration matching, while performing as well as controls on relative pitch and duration matching, across speech and music domains
Summary
Imitation is a fundamental skill that emerges early in typical human development (Meltzoff, 2017). It is essential for learning of complex constructs, including language (McEwen et al, 2007; Rose et al, 2009) and social interaction (Kuhl, 2007; Masur, 2006; Vivanti & Hamilton, 2014). When individuals with ASD are instructed to imitate an action or utterance, they imitate with lower levels of accuracy and do so less frequently than typically developing (TD) counterparts (Edwards, 2014; Turan & Okcun Akcamus, 2012; Vivanti & Hamilton, 2014).
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