The reductive effects of noncontingent reinforcement fixed-time versus variable-time schedules.

E and his team asked a simple question. Does it matter if we give noncontingent reinforcement on a fixed-time or a variable-time schedule?

They worked with two adults who had intellectual disability. The adults' problem behavior was kept going by a VR schedule of attention. The researchers switched between FT and VT NCR while counting the behavior.

Both schedules cut the behavior by the same amount. Fixed-time and variable-time were equally good.

The study showed you can pick either schedule and still get the drop you want.

Lancioni et al. (2009) later looked at many NCR studies. They called FT-NCR plus extinction "well established" and VT-NCR plus extinction "probably efficacious." The 2001 data sit inside that review, so the equal effect was part of the reason both schedules earned high marks.

Jones et al. (2025) flipped the story. When staff miss a few reinforcers, VT keeps behavior low better than FT. The 2001 finding of "equal" still holds under perfect care, but Jones shows VT wins when real-world slips happen.

Lerner et al. (2012) added another layer. They showed that thinning either schedule without extinction can bring the behavior back. Pair thinning with extinction and the good effect sticks.

You now know FT and VT start off equal, so you can choose the one that fits your room. If you worry about missed deliveries, lean toward VT. If you need to thin the schedule, add extinction and watch for any uptick. Pick, monitor, and adjust — the data give you freedom without guesswork.