Variable‐time schedules protect against effects of fidelity errors during noncontingent reinforcement
Variable-time NCR shrugs off missed reinforcers better than fixed-time NCR.
01Research in Context
What this study did
Jones et al. (2025) asked what happens when staff miss a few reinforcers during noncontingent reinforcement (NCR).
They compared fixed-time (FT) and variable-time (VT) schedules in a lab with neurotypical adults.
What they found
When every delivery was on cue, both schedules kept target behavior low.
Once the experimenter skipped some reinforcers, only the VT schedule held the gains.
How this fits with other research
Meuret et al. (2001) saw no difference between FT and VT when staff were perfect. Jones shows the gap appears only when fidelity slips—an apparent contradiction solved by adding error.
Lancioni et al. (2009) already called VT-NCR “probably efficacious” for developmental disabilities. Jones gives lab proof that VT can outshine FT under real-world hiccups.
Kelley et al. (2023) taught us to thin NCR faster with signals. Jones adds a second trick: use VT timing to guard against missed deliveries.
Why it matters
You can’t watch every second in a busy classroom. Switching from rigid FT to VT keeps the intervention strong even when you or the RBT miss a timer. Try it in your next session: keep the same hourly amount of attention or tangibles, but scatter the times randomly within each interval.
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02At a glance
03Original abstract
Noncontingent reinforcement (NCR) consists of response-independent reinforcer delivery according to a time-based schedule. Common application of NCR also includes withholding reinforcers following target behavior (i.e., extinction). Prior research suggests that inconsistent implementation (i.e., implementation with fidelity errors) of NCR programmed with fixed-time (FT) schedules results in degraded therapeutic outcomes. We conducted a human-operant evaluation to assess whether there were differences in responding (e.g., computer clicks) during reduced-fidelity NCR between FT and variable-time (VT) schedules. We randomly assigned participants to experience analogues of NCR with FT or VT schedules. Each participant experienced baseline, full-fidelity, and reduced-fidelity NCR in an ABAC design; FT or VT schedules varied depending on group assignment. Full-fidelity NCR was similarly efficacious at suppressing target behavior across the FT and VT groups, but VT schedules suppressed target behavior significantly better (p = .01) during reduced-fidelity NCR than FT schedules. Implications for researchers and practitioners are discussed.
Journal of Applied Behavior Analysis, 2025 · doi:10.1002/jaba.70034