DRO contingencies: an analysis of variable-momentary schedules.

Three adults with intellectual disability and hand-to-head self-injury took part. Each person’s self-hitting was already known to be maintained by adult attention (social-positive reinforcement).

The researchers compared three DRO schedules in an alternating-treatments design: variable-momentary (VM), variable-interval (VI), and fixed-interval (FI). Reinforcer delivery was the same across schedules—30 s of attention—only the timing rule changed.

All three schedules cut self-injury to near-zero levels during 10-min sessions. VM-DRO worked even when the therapist stepped back and checked behavior only at the end of each interval.

Because VM-DRO does not require watching every second, staff can run other programs or supervise other clients at the same time.

Lejuez et al. (2001) repeated the VM-DRO tactic with low-rate aggression and got the same clean reduction, showing the schedule travels across topographies.

Jessel et al. (2017) flipped the logic: instead of reducing problem behavior, they used momentary checks plus fading supervision to increase on-task work in a teen with autism. One procedure, two directions—behavior down or engagement up.

Marcell et al. (1988) reminds us to pick the function first. They taught communication for attention-maintained SIB and paired sensory items with restraint for automatic SIB. The 1999 paper keeps the social-attention function and zooms in on which DRO timer you set after that match is made.

If you have verified that attention drives the problem, VM-DRO gives you a low-effort option. You can guard other clients, collect data on a second target, or prep teaching materials while still delivering an evidence-based consequence. Try starting with a 2-min variable window and momentary checks; thin the schedule only after responding stays low and stable.