The relative aversiveness of signalled vs unsignalled avoidance.

Eight lab rats could switch between two shock-avoidance schedules. One schedule gave a brief light before every shock-delay period. The other gave no warning at all.

A lever press moved the rat to the other schedule. The team counted which side each animal picked and how long it stayed there.

Every rat moved to the signalled side and stayed there. They kept pressing the change lever to block unsignalled trials.

Warning stimuli turned the same shock contingency into a less scary deal.

Imam (2001) explains why the signal helped. The light worked as a safety cue, acting like a mini-reinforcer each time it came on. That fits the two-factor idea: fear drops when the cue appears, so the cue itself rewards staying in the schedule.

Fontes et al. (2018) used shock too, but to punish an alternative response. They saw old behavior bounce back. Here, the signal stopped that kind of burst by giving the rat something positive to hold onto.

Byrd (1972) showed rats can learn fear just by watching. Our 1971 paper shows they will also work hard to gain a signal that lowers that fear. Together they map both sides of observational learning: you can catch fear, then pay to tame it.

If a client avoids a task, adding a clear warning before the hard part can cut the aversiveness. A 5-second countdown, a color change, or a beep can act like the rat's light. Let the learner choose to turn the signal on and you may see less escape and more cooperation.