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Classic conditioning in aged rabbits: delay, trace, and long-delay conditioning

P R Solomon1, M E Groccia-Ellison

  • 1Department of Psychology and Program in Neuroscience, Williams College, Williamstown, Massachusetts 01267, USA. psolomon@williams.edu

Behavioral Neuroscience
|June 1, 1996
PubMed
Summary

Aging impairs classical conditioning, especially trace conditioning, in rabbits. Older rabbits show significant deficits earlier in trace conditioning compared to delay conditioning paradigms.

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Area of Science:

  • Neuroscience
  • Behavioral Science
  • Aging Research

Background:

  • Classical conditioning, specifically the nictitating membrane response, is a well-established model for studying learning and memory.
  • Age-related cognitive decline is a significant concern, and understanding its impact on fundamental learning processes is crucial.

Purpose of the Study:

  • To investigate the effects of aging on classical conditioning acquisition in rabbits across different conditioning paradigms.
  • To determine if age-related deficits manifest differently depending on the temporal relationship between conditioned and unconditioned stimuli.

Main Methods:

  • Young (0.5 years) and aged (2+, 3+, 4+ years) rabbits were trained using delay, long-delay, and trace classical conditioning paradigms.
  • The conditioned stimulus (CS) duration and interstimulus interval (ISI) or stimulus-free period varied across paradigms.

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  • Acquisition rates were compared between age groups and across conditioning paradigms.

    • Main Results:

    • Across all paradigms, aged rabbits generally acquired the conditioned response more slowly than younger rabbits.
    • Trace conditioning was acquired more slowly than delay conditioning in both young and aged rabbits.
    • Significant conditioning deficits in delay and long-delay paradigms appeared first in the oldest (4+ years) rabbits.
    • In the trace conditioning paradigm, significant deficits were observed earlier, in the 2+-year-old aged rabbits.

    Conclusions:

    • Aging significantly impairs classical nictitating membrane response conditioning in rabbits.
    • Trace conditioning paradigms reveal age-related deficits earlier than delay conditioning paradigms.
    • These findings highlight the differential impact of aging on distinct forms of associative learning.