Parameters of reinforcement and response-class hierarchies.

The team worked with adults who have intellectual disabilities. They wanted to see which reinforcer tweaks build the strongest response chains.

They tested four levers: how fast the reward comes (rate), how good it is (quality), how big it is (magnitude), and how long the wait is (delay). Each lever was pitted against the others in a single-case design.

High-quality snacks and big portions pushed the target response to the top of the chain every time. Rate came next. Delay came last—it barely shuffled the order.

In plain words: give a bigger cookie, not a faster cookie, if you want the skill to win.

Eisenmajer et al. (1998) showed a 3-s unsignaled delay crushed reinforcement power in pigeons. A et al. agree delay is weakest, but they rank it, not reject it—method difference, not a fight.

Hansen et al. (1989) found typical kids under age ten ignore delay entirely. A et al. still list delay as a player, just the weakest, because their group had intellectual disabilities and could notice longer waits.

Kang et al. (2013) systematic review says picking the right item matters most; A et al. prove quality and magnitude are the heavy lifters once the item is chosen.

Stop racing the clock. Spend your energy grabbing the best snack or the biggest handful, then deliver it after the target response. If you must add delay, signal it with a countdown or a tone so the learner knows the reward is still coming.