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Related Experiment Videos

Aging and learning-specific changes in single-neuron activity in CA1 hippocampus during rabbit trace eyeblink

M D McEchron1, A P Weible, J F Disterhoft

  • 1Department of Cell and Molecular Biology and Institute for Neuroscience, Northwestern University Medical School, Chicago, Illinois 60611, USA.

Journal of Neurophysiology
|October 16, 2001
PubMed
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Aging impairs trace eyeblink conditioning in rabbits by altering CA1 pyramidal neuron activity. Aged non-learners showed diminished neuronal responses and reduced ensemble coordination in the hippocampus, impacting learning.

Area of Science:

  • Neuroscience
  • Cognitive Aging
  • Behavioral Neuroscience

Background:

  • Trace eyeblink conditioning is a hippocampus-dependent learning task.
  • Aging can impair performance in this task, particularly in aged rabbits.
  • CA1-hippocampal activity is known to be affected by aging.

Purpose of the Study:

  • To investigate how aging affects the interaction of CA1 single neurons within local ensembles during trace eyeblink conditioning.
  • To compare neuronal activity in young and aged rabbits, distinguishing between learners and non-learners.

Main Methods:

  • Extracellular recording of CA1 pyramidal neurons in aged (29-34 mo) and young (3-6 mo) rabbits during 10 daily sessions of trace eyeblink conditioning.
  • Use of a stereotrode to record ensembles of 2-12 single neurons.

Related Experiment Videos

  • Analysis of neuronal firing patterns, hierarchical clustering of response types, and cross-correlation analysis for ensemble activity.

    • Main Results:

    • Aged rabbits exhibited a subset of non-learners, similar to pseudoconditioned rabbits.
    • CA1 pyramidal cell firing increases to conditioned stimulus (CS) and unconditioned stimulus (US) were diminished in aged non-learners.
    • Aged non-learners showed significantly lower coincident pyramidal cell firing within local CA1 ensembles.

    Conclusions:

    • Aging alters CA1 pyramidal neuron ensemble activity during trace eyeblink conditioning.
    • Reduced neuronal responsiveness and impaired ensemble coordination characterize aged non-learners.
    • These changes in hippocampal network activity likely contribute to age-related deficits in associative learning.