Increasing and signaling background reinforcement: effect on the foreground response-reinforcer relation.

Allan et al. (1994) worked with lab rats in an operant chamber. The rats pecked a key for food on a VI schedule. The team added a second VI schedule that ran in the background.

Sometimes the extra schedule was silent. Sometimes a tone told the rat extra food was coming. The researchers counted how the extra food changed the main key-peck rate.

When the background VI ran without a signal, the rats earned about twice as much food per hour. The extra food strengthened background reinforcement (Re).

When a tone signaled the background food, the rats slowed their main key pecks. The signal let them tell the two schedules apart, so Re dropped back down.

Rapport et al. (1996) built on this work two years later. They used the same concurrent VI setup but changed the overall rate and shape of the schedules. They found steeper matching slopes with exponential schedules, showing the Re idea holds across different timing patterns.

Leslie (1981) looked at tiny slices of time inside a single VI schedule. He saw local response rate rise where food was more likely. W et al. zoom out and show that a whole extra schedule can push or pull the same local rate by changing Re.

Williams (1971) ran concurrent FI and VI schedules and saw response ratios follow a power function with exponent 0.5. That result seemed to break strict matching, but W et al. clarify the picture: when you measure and control Re, the matching equation lines up again.

You now have an easy way to think about "hidden" reinforcement in your clinic. If a child is also getting snacks, attention, or iPad time while you run mand training, that extra Re can water down your program. Either remove the background reinforcers or make them part of the plan and signal them clearly. A simple cue—"First work, then iPad"—can cut Re and sharpen responding to your target task.