Automated contingent reinforcement of correct posture.

Paul et al. (1987) wanted to help an adult sit up straight. The man had an intellectual disability and spent most of the day slumped over.

They taped a mercury switch to his shoulder. When his back was upright, the switch closed and music or radio played. When he slumped, the sound stopped.

The team used a multiple-baseline design across three sitting positions to be sure the switch, not luck, caused any change.

Upright sitting jumped from almost zero to about half the time during sessions. The man also looked around more and vocalized while the music played.

Gains stayed high for the whole study. Staff only had to refill the tape player; no extra prompts were needed.

Lancioni et al. (2009) did almost the same thing with two boys. They used hand and back microswitches instead of a mercury tilt sensor. Both kids cut spasms and increased adaptive moves, showing the trick works across body parts and ages.

Stasolla et al. (2015) moved the idea into a classroom. Six children with cerebral palsy pressed a switch to pick literacy games. Academic engagement soared, proving the setup helps learning, not just posture.

Elliott et al. (2026) pooled 32 studies on matched sensory stimulation. Their meta-analysis backs the 1987 paper: giving people the exact sensory feedback they want reduces self-injury and repetitive acts.

You can turn almost any small movement into a remote control for reinforcement. Tape a tilt sensor to a trunk, a pressure switch to a finger, or a chin switch under a jaw. Link it to music, videos, or vibration. Clients get instant payoff for healthy posture, fine-motor practice, or academic work without you hovering. Start simple: one switch, one highly preferred stimulus, clear on/off contingency. Collect a few baseline points, then let the equipment do the prompting while you coach other skills.