Improving adaptive behaviors for autistic adults without intellectual disability through executive function training.

Executive functioning (EF) is a cognitive process used to perform various daily activities throughout one's lifespan. Autistic adults without intellectual disabilities (ID) also experience difficulties with EF, which is closely associated with adaptive behaviors. For this reason, it is important to improve adaptive behaviors through enhanced use of EF for autistic adults to transition into adulthood successfully. This study aims to conduct a randomized controlled trial to evaluate the effectiveness of a newly developed and modified intervention program. Thirty autistic adults without ID were randomly assigned to the treatment or waitlist group. The participants and caregivers completed various assessments and self-report questionnaires to measure everyday EF and adaptive behaviors. We performed linear mixed-effect modeling to compare the two groups. Data collected at pre-, middle, post-, and follow-up based on participants who completed the program were used to explore changes across time. While there were significant differences in the EF utility-scale (F=5.46, p = .027) between the treatment and waitlist groups, no group x time interactions were detected in other measures. Everyday EF and adaptive behaviors improved when comparing measurements at different time points (p < .001). Our program is Korea's first evidence-based intervention to improve everyday EF and adaptive behaviors for autistic adults without ID.