ANTAGONISM OF A BEHAVIORAL EFFECT OF D-AMPHETAMINE BY CHLORPROMAZINE IN THE PIGEON.

The team worked with two pigeons in a small box.

Each bird had to peck a key 30 times to earn food.

First they gave d-amphetamine. The drug made the birds stop working.

Then they added chlorpromazine. They wanted to see if the second drug would fix the first drug's effect.

They kept the same 30-peck rule the whole time.

Chlorpromazine brought the pecking back.

When both drugs were given together, the birds kept working and earned food again.

The drug pair worked better than either drug alone.

Valentine et al. (1981) ran a close cousin study. They also used d-amphetamine to stop pigeon pecking. Instead of chlorpromazine, they used chlordiazepoxide. That drug also let the birds peck again, but only when the birds were afraid of a warning light. The two studies line up: both show a second drug can undo d-amphetamine's shutdown.

FARMEMOORHEARSKELLEHER et al. (1964) used the same 30-peck setup with no drugs. They showed pigeons can learn long chains of work. COLWINOGRAD (1965) proves that drug effects can break that chain, and that another drug can fix it.

Sheldon (1971) looked at chained schedules where birds pause between links. COLWINOGRAD (1965) shows drugs can create pauses that look like poor motivation, but the pause is really a chemical effect that can be reversed.

If a client on stimulants suddenly stops working, the cause might be chemical, not behavioral. Before you change the program, check meds. If a doctor adds an antipsychotic, watch for a quick return to baseline. Track response rate daily so you can spot drug interactions early.