Low noise in autism: cause or consequence?

Gliga et al. (2015) wrote a theory paper. They asked: does the autistic brain start quiet, or does it learn to be quiet?

The team looked at adult EEG studies. These studies show less background noise in autistic brains. The authors said this calm may be a payoff after years of coping, not the first cause.

They urged scientists to run long-term studies. Track the same kids for years. See if noise drops only after repeated practice.

The paper finds no proof that low neural noise begins in infancy. It warns against treating adult EEG snapshots as birth traits.

Instead, the quiet signal may be a plastic, late-emerging fix. The brain turns down its own volume to deal with a busy world.

Shan et al. (2025) gives the very data the target wants. They scanned 800 autistic people many times. Sensory networks flipped from hyper- to hypo-connectivity just before teen years. This supports the idea that low noise can arrive later, not at birth.

Northrup et al. (2022) adds a parent view. In 4 104 autistic kids and adults, six out of ten had current sound sensitivity. If the brain grows quieter with age, yet ears still hurt, noise may drop in cortex but not in behavior.

McQuaid et al. (2024) shows the story holds in mid-life. Autistic adults still report loud sounds as painful even if their EEG looks calm. The mismatch tells us to watch real-life responses, not just brain waves.

For you as a BCBA, this means today’s calm client may have worked years to get there. Don’t assume past goals were easy. Ask about earlier sound sensitivities and adjust prompts now. Track sensory behaviors over months, not just one baseline. If you see sudden sound avoidance return, treat it as new data, not old history.