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Related Experiment Videos

Deficits in passive-avoidance learning following atropine in the developing rat.

D Blozovski, A Cudennec, D Garrigou

    Psychopharmacology
    |October 20, 1977
    PubMed
    Summary

    Cholinergic mechanisms are crucial for passive-avoidance learning in young rats. These systems mature significantly between days 17 and 21, impacting learning acquisition and response suppression.

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    Comptes rendus de l'Academie des sciences. Serie III, Sciences de la vie·1990

    Area of Science:

    • Neuroscience
    • Developmental Psychology
    • Pharmacology

    Background:

    • Cholinergic systems play a role in cognitive functions, including learning and memory.
    • Understanding the developmental trajectory of these systems is essential for identifying critical periods in brain maturation.

    Purpose of the Study:

    • To investigate the maturation of cholinergic inhibitory mechanisms involved in passive-avoidance learning in developing rats.
    • To determine the age-related changes in acquisition and extinction of conditioned responses under cholinergic blockade.

    Main Methods:

    • Rats aged 14 to 34 days were tested for passive-avoidance learning.
    • Acquisition and extinction were assessed following administration of saline, atropine sulfate, scopolamine hydrobromide, and alpha-methylatropine.

    Main Results:

    • Acquisition rates improved with age, showing a significant increase between postnatal days 17 and 21.
    • Atropine sulfate impaired acquisition at all ages and completely prevented it in younger rats (14-17 days).
    • Scopolamine disrupted learning in 17-day-old rats, while alpha-methylatropine had no effect.

    Conclusions:

    • Central cholinergic mechanisms are involved in response suppression from at least 14 days of age.
    • These mechanisms mature significantly between the 17th and 21st postnatal days.
    • The findings support the role of cholinergic pathways in the development of passive-avoidance learning.

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