Effects of chlorpromazine and d-amphetamine on escape and avoidance behavior under a temporally defined schedule of negative reinforcement.

Scientists gave rats two common drugs. One drug calms. One drug speeds up.

The rats worked to avoid mild electric shocks. The shocks came on a strict timer.

The team watched how many times the rats pressed a lever to stay safe.

The calming drug made rats press less. They let more shocks happen.

The speed-up drug made rats press more. They stayed safer.

Both drugs acted the same way they do in older shock tasks.

Martens et al. (1989) saw the same pattern in people. Diazepam slowed learning of new button sequences.

Joyce et al. (1988) showed scopolamine also hurt learning in a maze. Together the three papers say: drugs that calm or block memory cut new learning first.

Hatton et al. (2005) flipped the question. They asked if a calming drug could speed loss of old behavior. It did. So the same drug class can slow new learning yet hurry old learning to stop.

If a client takes calming medicine, do not panic when new skills lag. The old skills stay strong. Start teaching early in the day before the dose peaks. Give extra practice trials. Watch for slower acquisition and adjust your mastery criteria.