Drug effects under automaintenance and negative automaintenance procedures

Area of Science:

• Behavioral pharmacology
• Animal behavior studies
• Neuroscience

Background:

• Automaintenance procedures are used to study reinforcement schedules.
• Negative automaintenance procedures investigate the suppression of behavior.
• Pigeons are a common model organism in behavioral pharmacology.

Purpose of the Study:

• To investigate the effects of LSD, quipazine, haloperidol, and pentobarbital on keypecking in pigeons.
• To compare drug effects under automaintenance and negative automaintenance conditions.

Main Methods:

• Three food-deprived pigeons were trained on an automaintenance procedure.
• Drugs were administered acutely, and keypecking rates were measured.
• The procedure was switched to negative automaintenance, and drug effects were re-evaluated.

Main Results:

• Under automaintenance, LSD, quipazine, haloperidol, and pentobarbital dose-dependently reduced keypecking.
• Under negative automaintenance, LSD, quipazine, and haloperidol decreased or had no effect on keypecking.
• Pentobarbital increased keypecking at lower doses and decreased it at a higher dose under negative automaintenance.

Conclusions:

• The effects of these drugs on keypecking are dependent on the reinforcement schedule.
• Different drug classes exhibit distinct behavioral profiles in automaintenance paradigms.
• Findings suggest differential modulation of behavior by these agents under varying motivational states.