For years, experts tried to sort autism into clear boxes based on how people handle sensory input. But a new look at 223 autistic participants shows those boxes do not hold up. The study found that sensory processing differences form a continuous, non-linear pattern instead of distinct categories. This means every person sits somewhere on a spectrum of sensory severity rather than fitting into a specific group.
When researchers looked at brain activity during motion tasks, they saw a specific disconnect between the insula and sensorimotor cortices that matched this sensory severity. This disconnect did not appear when the brain was at rest. The study involved detailed behavioral profiles and neurobiological scans to map these connections.
The findings also revealed a difference between sexes. Autistic males showed heightened sensitivity in these connectivity patterns compared to others. While the data is strong on these patterns, the old method of sorting people into categories was found to be unstable and irreproducible. This shift helps explain why some treatments fail when they target the wrong group.