Delayed timeout as a procedure for reducing disruptive classroom behavior: a case study.

One student sat at a desk with a small lamp. When the child acted out, the teacher quietly turned the lamp on. The light meant "you just lost two minutes of Friday free time." No scolding. No removal. Just the glow.

E and colleagues flipped the lamp on and off across four phases to test control. Disruption dropped to zero while the light contingency was active and bounced back when it was removed.

The desk light alone stopped the behavior. No immediate timeout, no tokens, no reprimands. The simple signal that free time was shrinking did the work.

Each time the contingency returned, disruption stayed near zero. When the lamp meant nothing again, problem acts returned, proving the light was the lever.

Petursdottir et al. (2019) now supersedes this approach. Their function-based token system cut disruption even more and lifted academic work at the same time. They started with a brief assessment, then paired tokens with fading, something the 1971 study never tried.

Lydersen et al. (1974) extends the idea in a happier direction. Instead of threatening lost time, they paid kids tokens for accurate reading. Disruption still vanished, showing you can get the same peace by rewarding work, not warning of loss.

Lobb et al. (1977) is a conceptual cousin. They also used loss of free time, but for the whole class and only if stealing occurred. Both studies show free-time consequences work, yet the group contingency reaches more kids at once.

Schroeder et al. (1969) used the exact same tool — a desk light — but as a token to signal earned points, not impending loss. Behavior still improved, proving the lamp itself is powerful whether it promises reward or penalty.

You can cut disruption without stopping instruction. A silent visual cue keeps class moving while the contingency does the work. If you want an easy first step, place a small lamp on the desk and tell the student it means lost free time when lit. Pair it with data sheets to be sure the light, not something else, is driving the change. For bigger gains, move toward Petursdottir’s model: assess function, add academic reinforcement, and fade the system once behavior is steady.