A comparison of simultaneous and delayed reinforcement as treatments for food selectivity.

The team worked with kids who had autism and would only eat a few foods.

They used an alternating-treatments design. Some bites earned a reinforcer right away. Other bites earned the same reinforcer 30 seconds later.

The goal was to see which timing made kids accept new foods faster.

Both setups increased food acceptance. Yet immediate reinforcement won. Kids swallowed more bites and did it sooner when the reward came right after they swallowed.

Delayed reinforcement still helped, just more slowly.

Leon et al. (2016) ran the same immediate-versus-delayed food comparison while kids did table-top tasks. Again, immediate food beat delayed food, showing the rule holds outside of meals.

Pubylski-Yanofchick et al. (2022) moved the idea to adults with autism. Positive reinforcement still boosted fruit and veggie bites, proving the trick ages up.

Silbaugh et al. (2018) later showed what to do if reinforcement alone stalls. They added gentle physical guidance at home and acceptance jumped, giving clinicians a next-step option.

You can speed up feeding sessions by delivering the preferred item the moment the child swallows. No extra cost, just tighter timing. If progress still lags, pair this tip with later studies: check for establishing operations like Gabriels et al. (2001), or add brief guidance like Silbaugh et al. (2018). Immediate reinforcement is the first lever to pull.