An improved live-worm dispenser.

N et al. (1963) built a small machine that drops one live worm each time a fish swims past a sensor.

The gadget lets researchers study fish learning without standing there with tweezers.

The dispenser worked. Fish got worms right after they pressed a paddle or swam through a hoop.

Dry fish food had failed, but live worms kept the fish responding.

Shih (2011) used a $20 Wii Balance Board so two teens could trigger music by simply shifting their weight. Both studies swap hand-delivered treats for an automatic sensor.

Fine et al. (2005) and Chang et al. (2016) strapped motion detectors to walkers or legs. When the client stepped, favorite videos or songs played instantly, just like the worm drops for fish.

Baruni et al. (2025) and Rapp et al. (2025) timed music to each treadmill step. They copied the same moment-to-moment idea: one response, one reinforcer, no staff needed.

If you struggle to deliver reinforcement fast enough, copy these engineers. Snap a cheap motion sensor to the client’s shoe, cane, or chair. Let the sensor send a Bluetooth click to a tablet that plays a 2-second clip of a favorite song or cartoon. You get immediate, automatic, repeatable reinforcement without hovering.