Application of the Premack principle to the behavioral control of extremely inactive schizrophrenics.

Four adults in a state hospital did almost nothing all day. They sat, stared, and ignored food or games.

The team wanted work behavior: sorting, folding, stacking. They made sitting the reward. After 30 seconds of work, the patient could sit for two minutes. No work, no sitting. This is the Premack principle—use a high-probability behavior (sitting) to reinforce a low-probability one (work).

Sessions ran 30 minutes, twice a day, for each patient.

Work output jumped from near zero to 60-80 correct responses per session. Patients stayed on task without prompts.

When sitting was removed, work dropped. When it was returned, work rose again. The effect was clear for all four patients.

Fine et al. (2005) and Chang et al. (2016) show the same pattern. They used favorite videos or music instead of sitting. Once the fun stuff was contingent on movement, step counts and walking soared. All three studies turn "what the person already wants" into fuel for new behavior.

Scull et al. (1973) looks opposite at first glance. They paid cash to strangers for job leads. Cash is an external prize; sitting is internal. Yet both follow Premack: deliver a wanted event only after the target act. The reinforcer type changed, the rule stayed the same.

Turk et al. (2010) updated the tool set. They added iPhone cues to teach job steps. S et al. had no tech, just a timer and a chair. Together the papers trace a line: first prove the principle with bare-bones methods, then layer on modern supports.

If your client turns down snacks, breaks, or praise, watch what they do anyway. Sitting, rocking, staring at a ceiling fan—any safe repeat action can become a reinforcer. Arrange contingencies so the client must briefly do the target skill to "buy" that moment of comfort. Start with tiny work chunks (10–30 seconds) and give immediate access. You will see responding where none existed before.