Component duration and relative response rates in multiple schedules.

The team set up a two-part schedule. In one part, every 30 seconds of work could win food. In the other part, food came only every 90 seconds.

They kept switching between these two parts. Sometimes each part lasted 30 seconds. Sometimes it lasted 120 seconds. They watched how fast the birds pecked.

The birds always pecked faster in the rich 30-second part. The shorter each part lasted, the bigger the speed gap became.

When parts were brief, the difference looked huge. When parts were long, the gap shrank.

WEINELong (1963) saw the same 30-s vs 90-s boost years earlier, but that study added hunger as a twist. The new data show the boost holds even when hunger is fixed.

Sanders et al. (1971) let pigeons pick between two keys at the same time. Their birds also favored the key that paid faster. Catania (1972) shows the same bias appears even when the choices come one after another, not side-by-side.

Pomerleau et al. (1973) tinkered with how long brief stimuli stayed on. They learned that tiny cues can pump up responding. Catania (1972) adds that the sheer length of each schedule chunk matters just as much as any cue.

If you run mixed programs with clients, keep the easy-rich parts short. Brief chunks make the better payoff stand out and keep responding strong. Try 30-second segments of high-rate praise tucked between longer lean spells. You should see the learner stay more engaged during the rich moments.