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Trigeminal denervation and operant behavior in the rat.

M F Jacquin, H P Zeigler

    Behavioral Neuroscience
    |December 1, 1984
    PubMed
    Summary

    Bilateral section of trigeminal nerves, particularly the motor nerve, significantly impaired instrumental responses like lever pressing. This suggests trigeminal denervation affects motivated behaviors even without direct trigeminal involvement.

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    Area of Science:

    • Neuroscience
    • Behavioral Neuroscience
    • Sensory Systems

    Background:

    • The trigeminal nerve (cranial nerve V) plays a crucial role in orofacial sensation and motor control.
    • Its contribution to instrumental learning, particularly in tasks not directly requiring orofacial responses, remains incompletely understood.

    Purpose of the Study:

    • To investigate the role of the trigeminal sensorimotor system in instrumental conditioning.
    • To determine if denervation of trigeminal sensory or motor pathways affects performance in food- or water-reinforced tasks.

    Main Methods:

    • Two experiments involving selective sectioning of trigeminal sensory and/or motor nerves in subjects.
    • Assessment of instrumental response rates (lever pressing) reinforced by food or water.

    Main Results:

    • Unilateral section of either trigeminal sensory or motor nerves did not significantly alter lever pressing rates.
    • Bilateral section of trigeminal nerves significantly reduced lever pressing performance.
    • The most substantial deficit in lever pressing was observed following bilateral trigeminal motor nerve section.

    Conclusions:

    • Trigeminal orosensory or oromotor denervation disrupts performance in instrumental tasks reinforced by food or water.
    • These findings suggest that the trigeminal system influences motivated behavior and instrumental learning beyond its direct sensory or motor functions.
    • The results support the integration of motivational and reinforcement theories in understanding instrumental learning deficits after trigeminal nerve damage.

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