Chronic amphetamine: effects on defensive flight in the rat.

Area of Science:

• Neuroscience
• Pharmacology
• Behavioral Science

Background:

• Amphetamine abuse can lead to psychosis.
• Existing models of amphetamine psychosis have limitations.

Purpose of the Study:

• To investigate the behavioral effects of chronic d-amphetamine sulfate administration in rats.
• To establish a novel defense-response paradigm for studying chronic amphetamine effects.

Main Methods:

• Hooded rats received daily d-amphetamine sulfate injections over 13 days, mimicking abuse patterns.
• A novel stimulus (mechanical robot) and a treadmill were used to assess flight responses.
• Behavioral data were collected to quantify time spent in different apparatus zones.

Main Results:

• Amphetamine-treated rats exhibited a significant flight reaction to the novel stimulus, unlike controls.
• Amphetamine-treated rats spent most of their time farthest from the stimulus, indicating avoidance.
• Motor stereotypy did not prevent the execution of the defense response.

Conclusions:

• The defense-response paradigm is effective for studying chronic amphetamine effects.
• This model may serve as a valuable addition to existing models of amphetamine psychosis.