In recent years, it has become known that children with developmental disabilities have hearing-related difficulties in the learning environment. In this study, we investigated the influence of ambient sound as background noise on the performance of four different cognitive tasks by subjects with developmental disability characteristics, and whether this was mitigated by the sound absorption of the room. The results showed that subjects with developmental disability characteristics tended to score relatively higher on some cognitive tasks under conditions where sound-absorbing material was installed. While further investigation is needed, the results suggest a positive effect of sound absorption.
