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Past research has investigated various forms of conversational technology for people with NDD, but only a few studies have explored the use of conversational agents to reduce alexithymia. This paper presents Emoty, a speech-based conversational agent designed for people with NDD to train emotional communication skills. An original characteristic of this agent is that it exploits the emotional expression power of the <jats:italic>voice<\/jats:italic>. Emoty engages users in small conversations during which they are asked to repeat sentences and express specific emotions using the appropriate vocal tone. We ran an empirical study to evaluate the usability and effectiveness of our conversational agent. The study involved 19 Italian individuals with NDD and alexithymia aged from 29 to 45 (10 women and 9 men). They used Emoty in five individual sessions over two and a half months. The results showed that two subjects encountered problems using the system because they had difficulty verbalizing the sentences and were not understood by Emoty. The others performed the assigned tasks with the agent. Their capability to express emotions with the voice consistently improved, and other benefits were observed in other social and communication skills.<\/jats:p>","DOI":"10.1007\/s11042-022-14135-w","type":"journal-article","created":{"date-parts":[[2022,11,9]],"date-time":"2022-11-09T01:02:38Z","timestamp":1667955758000},"page":"12797-12828","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["A conversational agent for emotion expression stimulation in persons with neurodevelopmental disorders"],"prefix":"10.1007","volume":"82","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5403-9002","authenticated-orcid":false,"given":"Fabio","family":"Catania","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Franca","family":"Garzotto","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,11,9]]},"reference":[{"issue":"1","key":"14135_CR1","doi-asserted-by":"publisher","first-page":"69","DOI":"10.1007\/s41252-017-0041-5","volume":"2","author":"AA Allen","year":"2018","unstructured":"Allen A A, Shane H C, Schlosser R W (2018) The echo\u2122as a speaker-independent speech recognition device to support children with autism: an exploratory study. 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