Snoezelen is a useful modality for people with severe handicaps and people with dementia and growing in popularity in this domain. Effect on developmental disorders, however, has not been fully delineated. The aim of this manuscript is to review articles on the wide range of clinical application of Snoezelen with special concern to the study
on autism spectrum disorder (ASD). Qualitative studies suggested favorable effect on ASD, while studies based on the ABA/ABAB design did not report favorable effects on ASD by Snoezelen environment. Further studies are needed to evaluate the effect by observing an appropriate period based on carefully selected subjects.