Autistic Spectrum Disorder (ASD) or Autism in short is a complex, lifelong developmental disability that typically appears during early childhood and can impact a person's social skills, communication, relationships, and self-regulation.

Going by the name it is clear that there are a number of ways that autism manifests itself in children with some being oversensitive (hyper sensitive) and others being under sensitive (hypo sensitive) to various sensory stimuli around including sound.