Self-injurious behavior in Rett syndrome: interactions between features of Rett syndrome and operant conditioning.

One girl with Rett syndrome kept hitting her own face and biting her hand.

The team ran a short functional analysis. They gave her toys, then took them away. They gave demands, then let her rest. They even left her alone for a few minutes.

Each test lasted only five minutes. They watched which condition made each form of self-injury spike.

Face hitting happened most when the room was empty. It looked like automatic reinforcement—she did it for her own sensory feedback.

Hand biting happened most when adults gave demands. It looked like escape—she did it to get out of work.

Two topographies, two jobs. One behavior was not just "more severe." It was a different tool.

Allison et al. (1980) showed the same escape pattern in two boys with ID 13 years earlier. Their work gave the template: if problem behavior drops when you remove demands, treat it as escape.

Raslear et al. (1992) later found that up to 41 % of girls with Rett use challenging behavior to communicate. The new case says you still test each form, even if it might be "talking."

Chen et al. (2017) warn that sleep loss and ADHD signs can also drive aggression in ASD. The Rett case adds: once medical variables are ruled out, run a mini-analysis for every separate movement.

If you treat all self-injury in Rett as one thing, you might pick the wrong intervention. Automatic behavior needs enrichment or response blocking. Escape behavior needs demand fading and a break request. Next time you see mixed topographies, run a five-minute test for each form. Match the cure to the cause, not the diagnosis.