Jack Michael's Motivation.

Miguel (2013) walks through how Jack Michael rebuilt the idea of motivation.

Instead of hidden drives, he put the spotlight on environmental events he called motivating operations, or MOs.

The paper tracks how that single shift changed both research questions and what clinicians do in sessions.

Michael showed that motivation is not inside the person; it is outside, in the situation.

When an MO is in play, it changes two things at once: how much a reinforcer is worth and how likely the behavior is to happen.

The article maps how this view moved from a textbook footnote to a must-check variable in every ABA study.

Critchfield et al. (2003) gives a live example. They saw a reward kill play because the child liked the activity more than the prize. Their data extend Michael’s point: value is relative to the moment, not baked into the item.

Sayers et al. (1995) and WFrazier et al. (2023) work on the same playground. One paper sharpens the matching law; the other sharpens extinction bursts. Both treat behavior as a reaction to local conditions, the same lens Michael sold us for motivation.

LeGoff (2004) adds the human side. It collects stories of scientists whose whole career path bent after one class with Michael. The conceptual paper you are reading now is the technical spine behind those personal tales.

Check MOs first, reinforcers second. Ask what the client just did without, what they now need, and how badly. Then pick your reinforcer and your program. That quick switch can save you weeks of weak data and frustrated kids.