Behavioral engineering: two apparatuses for toilet training retarded children.

The team built two cheap alarms. One beeped when a child sat on the potty chair. The other beeped the instant underwear got wet.

Four profoundly delayed children wore the pants alarm all day. Staff gave a quick "No" when it sounded and praised or gave candy when the potty alarm sounded.

The study ran in a single-case design. Each child served as his own control.

Both gadgets worked every time. The pants alarm never missed a drop. The chair alarm never lied about sitting.

All four kids learned to stay dry during the day. Accidents dropped to zero and stayed there.

Herman et al. (1971) tried the same signal idea with nine institutionalized adults. They added extra drinks and reached near-zero accidents in only four days. The child version took longer, but the core idea—sound the moment wetness happens—held firm.

Raslear et al. (1992) followed adults for ten years after similar training. Most still used the bathroom on their own and needed fewer prompts. The 1971 gadgets started a method that lasts.

Bacotti et al. (2023) looked back at this line of work. They say the field now needs fresh studies that meet today’s ethics rules, but the basic alarm trick is still sound.

You can copy these two alarms with parts from any hardware store. Wire a potty seat to a doorbell. Clip a moisture sensor to underwear. The instant feedback lets you reinforce success and correct accidents right away. Try it next week with one hard-to-train client. Track accidents for a week, then add the alarms and watch the data drop.