The relationship between auditory processing and restricted, repetitive behaviors in adults with autism spectrum disorders.

Niko and colleagues tested how well adults with autism hear small sound changes.

They asked each adult to tell apart beeps that differed in loudness, pitch, or length.

The team also measured IQ and repetitive behaviors to see if scores lined up with hearing errors.

Adults with autism missed more sound changes than matched controls.

The worse their hearing scores, the lower their IQ and the more repetitive behaviors they showed.

No one had super hearing; the group was uniformly behind.

Ben-Sasson et al. (2019) pooled dozens of studies and confirm that sensory over-responsivity is a core autism marker. Their big picture supports these fine-grained hearing gaps.

Soulières et al. (2007) saw the same pattern earlier: autistic adults could label sounds but did not get the usual boost from category knowledge. Niko’s work adds that this deficit tracks with day-to-day repetitive actions.

Irwin et al. (2022) looked at kids and found weak lip-reading help during speech. Both studies show the ear alone carries the load in autism, across age and task.

If a client repeats lines or flick objects, check their hearing first. Poor sound discrimination can feed the need for sameness. Give clear, steady auditory cues and cut background noise. When you write goals, teach the ear before you teach language.