BRAIN STIMULATION AS A REINFORCER: INTERMITTENT SCHEDULES.

Scientists wired rat brains so a mild zap felt good. They used the zap as pay-off on four classic schedules: FI, FR, DRL, and VI.

Each rat worked alone in a box. Press the lever, get a buzz. No food, no water, just brain pleasure.

The zap pulled the same lever-patterns we see with food. FI made the familiar scallop. FR gave the steep run-pause curve.

Even tiny inter-response times fell into the same rhythm seen with pellets. The brain itself can act like a cookie.

Rogers-Warren et al. (1976) later added a clock to FI and avoidance. People worked smarter, not harder. The 1965 rats show the base pattern; the clock study shows we can polish it.

Thomas (1968) and Davison (1969) zoomed in on FR micro-structure. Their food-based curves match the brain-zap curves beat for beat. Same engine, different fuel.

Catania et al. (1972) tracked accuracy inside FI segments. Accuracy dipped mid-interval, then rose. The 1965 zap study proves the FI scallop still forms even when the reinforcer is silent electricity, giving the 1972 accuracy waves a firmer base.

If you ever swap reinforcers—tokens, praise, brain-zap, whatever—expect the schedule signature to stay. Watch for scallops, runs, and pauses, not the form of the payoff. Let the pattern tell you the schedule is working, even when the prize is invisible.