Effects of repeated exposure to escalating versus constant punishment intensity on response allocation
A fixed, moderate punishment level stops the target response faster than slowly raising intensity from a low start.
01Research in Context
What this study did
The team compared two ways to deliver electric-shock punishment. One group got a steady, moderate shock every time they pressed the wrong lever. The other group started with a tiny shock that grew a bit after each error.
All subjects lived in a chamber with two levers. Pressing one lever gave food. Pressing the other also gave food, but added the shock. The researchers watched which lever the animal chose.
What they found
The steady, moderate shock quickly pushed the animals to the safe lever. The slow-build shock let them keep pressing the punished lever longer.
When the animals returned after a short break, the pattern stayed the same. The steady shock still worked best.
How this fits with other research
Barber et al. (1977) and Goldman et al. (1979) saw broad suppression with money loss. Fontes et al. (2022) show that how you set the intensity matters as much as the fact you punish.
Deluty et al. (1978) found rats shift time to avoid higher shock rates. The new data add that a fixed, middle-level shock beats a gentle ramp-up.
Together, the papers say: punishment can work, but the dose and the way you raise it change the speed of the effect.
Why it matters
You rarely use shock, but you often scale consequences. The study warns that starting mild and slowly climbing may teach the client to tolerate the aversive, not avoid it. If you must use punishment, pick a clear, stable level from the start. Check that the learner can already escape or earn reinforcement elsewhere, then watch the first few trials closely.
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02At a glance
03Original abstract
The present experiment investigated the effects of 1) repeated exposures to escalating punishment intensities and 2) repeated exposure to punishment after periods of vacation on response allocation between punished and unpunished responding in three groups of rats. The first group (intensity + vacation) experienced repeated exposures to escalating punishment intensities after a period of vacation (i.e., return to baseline) from punishment. The second group (intensity-only) experienced repeated exposures to escalating punishment intensities without vacation from punishment. The third group (vacation-only) experienced repeated exposures to a constant punishment intensity after a period of vacation from punishment. Results showed that superimposition of punishment on one of two concurrently available responses decreased allocation toward the punished response and increased allocation toward the unpunished response. Furthermore, greater changes in allocation were observed with the introduction of a moderate constant intensity than with the introduction of a low intensity that increased across sessions. Reexposure to punishment had different effects between the groups. Although there was evidence that high shock intensities can enhance the efficacy of lower intensities to shift allocation away from the punished response and toward the unpunished response, there was little evidence of changes in response allocation with reintroduction of punishment after a period of vacation.
Journal of the Experimental Analysis of Behavior, 2022 · doi:10.1002/jeab.766