The effects of fixed-time reinforcement schedules on functional response classes: a translational study.

The team worked with neurotypical preschoolers in a lab playroom.

They set a fixed-time schedule that gave a reinforcer every 30 seconds no matter what the child did.

The reinforcer was delivered for only one member of a response class—pressing a big red button.

Other similar responses like flipping a switch or kicking a ball were left alone.

The question: would the free treats for button pressing also cut the untreated behaviors?

Yes. When the timer delivered candy for button presses, all other play responses in the same class dropped.

The untreated behaviors fell even though they never produced a treat.

This shows that noncontingent reinforcement aimed at one topography can suppress an entire functional response class.

Hagopian et al. (2000) and Critchfield et al. (2003) saw even bigger drops. They gave kids continuous access to highly preferred items and problem behavior neared zero. Their large, lasting effects set the bar for what NCR can do.

Coe et al. (1997) saw mixed results. They also used fixed-time food, but response rates bounced around depending on the schedule ratio. The 2012 study clarifies why: when the reinforcer is tied to one member of a class, collateral suppression is cleaner.

The older lab work (A et al. 1971; B 1968) showed that response-independent reinforcers can either suppress or raise behavior depending on context. Heinicke et al. (2012) narrows the takeaway—target one class member and the rest fall in line.

If you run NCR for one problem behavior, watch the whole class. You might get bonus reductions without extra work.

But probe untreated topographies; if they share a function, they should drop too. If they don’t, check your reinforcement history or satiation level—lessons drawn from the earlier, stronger studies.