"Whom would you like to talk with?" exploring conversational agents for children's linguistic assessment

The dramatic increment of communication impairments among children increases the demand for intensive, highly accessible and low-cost interventions as well as new assessment and therapeutic tools. Our research aims at exploring the use of Conversational Agents (CAs) to support linguistic assessment and training among children with language impairment. One of the open research issues in this arena concerns the identification of the most appropriate form of embodiment of the CA for children to interact with. To this end, we evaluated the linguistic performance of 14 neuro-typical children and 3 children with language impairment comparing different CAs - physical object and virtual character - with traditional human interaction. Based on our analysis, we identify insights for the design of CA: the physicality does influence the performance of linguistic tasks for children with linguistic impairment. In addition, children seem to show a preference for the physical CA and perceived it as smarter than the virtual one.