Has language developed to serve as a system of communication or one of thought? While language is clearly an excellent tool for communication, the possible contribution of higher order cognitive processes other than language to communication may provide insights on how we think about language evolution. Studies show that bilingualism improves communication skills, possibly due to boosting domain general processes, thus suggesting a divide between communication and formal language. However, to date little attention has been paid to bilingual atypical child (...) populations presenting asymmetric developmental delays in language and communication skills. In this study, we explore the language-communication divide in bilingual and monolingual children diagnosed with High Functioning Autism (HFA), displaying primary communication difficulties, and those with Specific Language Impairment (SLI), displaying primary language difficulties. Children were tested on language, cognitive control, Theory of Mind (ToM), social comprehension and verbal communication. Results demonstrate that bilingual children with HFA exhibit enhanced cognitive control, ToM and social comprehension, which in turn improve their verbal communication as compared to their monolingual peers with HFA. On the other hand, no boost emerges in bilingual children with SLI, be it in cognitive control or ToM, though a weaker advantage (relative to the children with ASD) can be observed in their verbal communication skills, with significant mediation from social comprehension. The overall evidence suggests that language, though useful for communication, is not sufficient for communication, and may arguably not have evolved primarily for communicative purposes. (shrink)

Children with developmental language disorder reportedly struggle with the comprehension of aspect. However, since aspect and tense are closely entangled in the languages spoken by the children with DLD in previous studies, it is unclear whether the difficulty stems from aspect, tense, or both. Mandarin Chinese, a language without morphological manifestations of tense, is ideal to investigate whether the comprehension of aspect is specifically affected in children with DLD, yet to date work on this is scarce and presents methodological limitations. (...) In this study, we examined whether preschool Mandarin-speaking children with DLD have difficulty in comprehending perfective aspect compared to imperfective aspect, whether performance can be explained in terms of the pre- vs. post-verbal realization of the aspect markers, and the potential role played by lexical aspect in the comprehension of grammatical aspect. Fourteen preschool children with DLD and 14 TD children matched for age and nonverbal intelligence participated in a sentence-picture matching task. Global results showed that, similar to their TD peers, children with DLD performed better on imperfective aspect than perfective aspect. Concerning specific aspect markers, while children with DLD indeed performed similarly to TD children on imperfective -zhe, they obtained significantly lower accuracy than TD children on perfective -le and imperfective zai-. However, considering verb types combined with these aspect markers, results revealed that children with DLD scored significantly higher on the prototypical combination than on the non-prototypical combination. The performance pattern suggests that the comprehension of aspect markers by children with DLD is particularly affected by lexical aspect. As this also affects younger TD children, children with DLD are arguably at an earlier stage of aspectual development than their age and nonverbal intelligence matched TD peers. Therefore, the aspectual development of children with DLD appears to be delayed rather than deviant. Given this, language programs addressing difficulties in DLD may need to incorporate training on the use of aspect markers, especially targeting their combination with non-prototypical verbs. (shrink)