Increasing simple toy play in profoundly mentally handicapped children: II. Designing special toys.

The team built toys that buzzed, lit up, or played a short sound the instant a child touched them.

They gave these toys to a small group of children with profound intellectual disability and watched what happened.

Kids reached for the sensory toys more often than for regular blocks or dolls.

While the children played, their hand-flapping and body-rocking dropped.

One year earlier the same lab tried basic operant training and saw almost no gain in play (G et al. 1985). The new toys did what teaching alone could not.

Kahng et al. (1999) later showed that simply handing kids objects and praising them does not cut stereotypy unless you also block the repetitive move. The 1986 toys succeeded without any blocking, hinting that built-in sensory payoff can compete with stereotypy.

Kent et al. (2020) moved the idea into peer play. They let typical classmates prompt children with autism and also saw more play. Together the papers show you can either jazz up the toy or jazz up the social scene—both routes work.

If you serve clients who have very low play skills, swap in a cause-and-effect toy that gives instant vibration, light, or sound. No extra teaching time is needed. The toy itself becomes the reinforcer and may lower stereotypy at the same time.