Distributional properties of operant-level locomotion in the rat.
Scarcity speeds up return time, not response form.
01Research in Context
What this study did
Scientists watched rats run in a wheel. They let the rats use the wheel only one hour each day.
They counted how often the rats ran, how fast each spin was, and how long each burst lasted.
What they found
When wheel time was scarce, the rats ran more often. They did this by taking shorter breaks between bursts.
Speed per spin and burst length stayed the same. Only the pause time changed.
How this fits with other research
PREMACK et al. (1963) ran the same setup one year later and saw the same pause-shortening effect. This direct replication gives us confidence the pattern is real.
Simpson et al. (2001) later showed that, within a single hour, running drops off because of habituation, not tiredness. Their work extends the 1962 finding by explaining why pauses grow even when the wheel is still available.
Kazdin (1977) used the same wheel response to test the matching law. Rats split their time between running and drinking sugar water in the exact ratios the law predicts. The 1962 paper gave E a reliable baseline to build on.
Why it matters
For BCBAs, the big lesson is timing. Reinforcement scarcity changes when responses happen, not how they look. If you restrict access to a preferred item, expect quicker returns to the item, not faster or longer use. Watch the inter-response time first when you graph behavior change.
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02At a glance
03Original abstract
Four rats had continuous access to activity wheels first, then access for 1 hr per day, and, subsequently, continuous access. Limiting S's access to the wheel substantially increased the total frequency of running. A distributional analysis of response duration, burst duration, and interburst interval showed that the increased frequency arose almost entirely from a shortening of the interval between successive bursts. In contrast, speed of the individual response and number of responses per burst changed only negligibly. If S were running, the probability that it would either stop or continue did not differ appreciably for the conditions of continuous or limited access to the wheel. But if S were not running, the probability that it would start running was appreciably greater for limited than for continuous access.
Journal of the experimental analysis of behavior, 1962 · doi:10.1901/jeab.1962.5-89