EFFECTS OF VARYING CYCLE LENGTH IN A TAU REINFORCEMENT SCHEDULE.

CUMMINBOWER et al. (1963) tested pigeons on a tau schedule. The birds pecked a key for food.

The team changed only one thing: how long each reinforcement cycle lasted. They watched response rate, total reinforcements, and responses needed per food delivery.

Short cycles made the birds peck faster and earn more food each session.

Middle-length cycles needed the fewest pecks per food. Too-short or too-long cycles needed more.

Mahoney et al. (1971) also shortened cycles, but on a cyclic-interval schedule. Their birds paused less and tracked time better. Both studies show short cycles boost output.

Leslie (1981) looked at local reinforcement rate on variable-interval schedules. Response rate rose wherever food was more likely, matching the tau finding that denser cycles speed responding.

Thomas (1968) broke response rate into parts. CUMMINBOWER et al. (1963) show one lever you can turn—cycle length—to move those same parts up or down.

If you use cyclic or intermittent reinforcement, tighten the cycle when you need more responses or more reinforcement moments. Watch for the sweet spot where responses-per-reinforcement are lowest; going shorter or longer wastes effort. This keeps clients engaged without extra cost.