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Effect of atropine on behavioral arousal in the developing rat
Developmental Psychobiology
|March 1, 1975
Summary
Atropine significantly altered behavioral arousal in developing rats. A cholinergic inhibitory mechanism controlling arousal matures after 25 days of age in rats.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Cholinergic systems play a crucial role in regulating behavioral arousal.
- Understanding the developmental trajectory of these systems is vital for comprehending neurodevelopmental processes.
Purpose of the Study:
- To investigate the effects of atropine, a muscarinic antagonist, on behavioral arousal in developing rats.
- To determine the age at which cholinergic mechanisms controlling arousal become functional.
Main Methods:
- Rats aged 21–40 days were administered atropine (10 mg/kg, i.p.).
- Behavioral arousal was assessed using spontaneous activity measures on an elevated T-maze, including errors, rearing, and stereotyped responses.
Main Results:
- Atropine decreased spontaneous activity in rats younger than 25 days.
- Behavioral arousal significantly increased between 26 and 30 days, peaking on day 28.
- The effects of atropine were minimal in rats older than 30 days.
Conclusions:
- The findings suggest a developing cholinergic inhibitory mechanism that regulates behavioral arousal.
- This mechanism appears to mature and become efficient after the 25th day of life in rats.
