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Changes in unit postsynaptic responses at sensorimotor cortex with conditioning in rabbits.

L L Voronin, S V Ioffe

    Acta Neurobiologiae Experimentalis
    |January 1, 1974
    PubMed
    Summary
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    Researchers established a localized, conditioned startle reaction (LCSR) in rabbits using electrical brain stimulation. Conditioning altered neuronal responses in the sensorimotor cortex, suggesting a direct pathway for learned startle responses.

    Area of Science:

    • Neuroscience
    • Behavioral Neuroscience
    • Electrophysiology

    Background:

    • Conditioned startle reactions are crucial for understanding learning and memory.
    • Investigating the neural mechanisms underlying conditioned responses provides insight into synaptic plasticity.

    Purpose of the Study:

    • To establish and characterize a localized, conditioned startle reaction (LCSR) in rabbits.
    • To investigate the electrophysiological changes in the sensorimotor cortex associated with LCSR.
    • To explore the neural pathways involved in conditioned startle responses.

    Main Methods:

    • Electromyography (EMG) was used to record LCSR in rabbits.
    • A complex unconditional stimulus (electrical stimulation of sensorimotor cortex and hypothalamus) was employed for conditioning.

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  • Intracellular and quasi-intracellular recordings were performed in the sensorimotor cortex to analyze postsynaptic responses.

    • Main Results:

    • A LCSR to a click stimulus was successfully established.
    • Postsynaptic response latencies in the sensorimotor cortex were significantly shorter in conditioned animals compared to naive or extinguished states (P < 0.011).
    • A subset of neurons in conditioned animals exhibited extremely short latencies (4-7 ms) to the conditioned stimulus, suggesting rapid cortical processing.

    Conclusions:

    • The findings suggest that synaptic effectiveness increases in the sensorimotor cortex, underlying the neuronal mechanism of conditioning.
    • The short latency neuronal responses indicate a potential pathway for LCSR involving the sensorimotor cortex.
    • Cortical changes occur independently of proprioceptive feedback, highlighting direct neural alterations during conditioning.