To map the evidence from the relevant studies regarding the use of music and sound-based intervention for autism spectrum disorder (ASD) using a scoping review study design. Scoping review was conducted according to the inclusion criteria using Google Scholar, PubMed, CINAHL, MEDLINE, and Scopus. The review was accomplished in five steps: 1) identify the inclusion criteria, 2) search for relevant studies, 3) studies selection, 4) data extraction and charting, and 5) data analysis and presentation. Four major themes emerged from 39 studies that matched the inclusion criteria as follows: 1) forms of sound therapy discussing methods of sound therapy and stimulus used, 2) duration of the intervention explain in terms of listening time and total listening sessions, 3) clinical characteristics of the intervention exploring the main interest of sound therapy study in ASD, and 4) evidence for the intervention effectiveness looking into the positive, negative, and mixed findings of previous studies. Each theme was explored to identify the knowledge gaps in sound-intervention therapy. This review demonstrated the need for further studies to address several issues including identifying the effectiveness of sound-therapy intervention for ASD according to the individual sound types, the minimum duration for ASD sound-therapy intervention and more details on the use of technology, and clinical features of the sound-therapy intervention. These elements are important to further demonstrate the effectiveness of sound therapy intervention for ASD children.

Parent-implemented language intervention (PILI) is one of the intervention approaches used in managing late talkers (LTs). Yet, there are few evidence-based PILI programs available for parents of LTs. This scoping review aimed to (a) assess the characteristics of participants depicted in the literature related to PILI programs for parents of LTs, (b) provide an overview of the structure and design of the available PILI programs for parents of LTs, and (c) explore the effectiveness of the programs in relation to the characteristics of reviewed studies. The scoping review was performed by adhering to the general principles prescribed by Arksey and O’Malley (2005). Articles that fulfilled the inclusion criteria and were published from 1980 to 2018 were selected. Two reviewers independently charted the information from the identified articles. A total of 15 articles were selected. The results were reviewed in terms of participant characteristics, intervention characteristics, and effectiveness of PILI programs. Most adult participants in PILI studies were mothers and included child participants with either expressive language delay or receptive and expressive language delay. Moreover, there were different structures and designs of PILI programs for parents of LTs. Preliminary evidence indicated that PILI was more effective than no/delayed intervention and could be as effective as direct therapy provided by clinicians. A discussion related to the findings was also presented.