Chained and tandem fixed-interval schedules of punishment.

Macht (1971) compared two ways to space mild electric shocks. One way was a chained schedule. The other was a tandem schedule. Pigeons pecked a key under both setups.

In both setups shocks came at fixed times. The only difference was whether a signal marked each part. The study asked: does the signal change how much the shocks stop responding?

Shocks slowed pecking in both setups. But the slowdown was weaker early in the chained schedule. The same shocks in a tandem schedule cut responding more.

In short, adding signals softened the early punch of punishment.

GOLLUMIGLER (1964) saw the same pattern with food, not shocks. Pigeons also paused less early in chained reinforcement. The new study shows the structure effect holds when you flip from reward to punishment.

Glodowski et al. (2020) later tested autistic teens with token boards. Token boards are chains. Two of four teens worked less when tokens were added. The lab finding echoed in kids with autism decades later.

Henton (1972) looked at choice between chained and tandem food schedules. Birds picked each path equally. That seems to clash with Macht (1971). But W measured which side they pecked, not how much. The two papers ask different questions, so the results do not truly conflict.

If you use response cost or time-out, think about signals. Breaking the period into signaled steps can soften the early suppressive hit. This helps when you want to cut behavior but keep the client working. Probe responding after each link so you catch unwanted drops early.