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Trigeminal-taste interaction in palatability processing.

K C Berridge, J C Fentress

    Science (New York, N.Y.)
    |May 10, 1985
    PubMed
    Summary
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    Trigeminal nerve transection in rats reduced preferred taste intake without affecting aversion. This highlights the interaction between somatosensation and gustation in processing palatability.

    Area of Science:

    • Neuroscience
    • Sensory Physiology
    • Behavioral Science

    Background:

    • Palatability, the perceived pleasantness of food, influences ingestive behavior.
    • The trigeminal nerve provides somatosensory information from the face, including the oral cavity.

    Purpose of the Study:

    • To investigate the role of trigeminal somatosensation in taste perception and motivated feeding behavior.
    • To determine if trigeminal nerve damage affects the processing of preferred versus aversive tastes.

    Main Methods:

    • Surgical transection of the sensory branches of the trigeminal nerve in a rat model.
    • Behavioral assessment of ingestive actions in response to preferred and aversive taste stimuli.
    • Evaluation of the capacity for ingestive actions post-surgery.

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    Main Results:

    • Peripheral trigeminal nerve transection selectively reduced ingestive actions towards preferred tastes.
    • Aversive actions elicited by unpreferred tastes remained unaffected.
    • The reduction in positive ingestive actions occurred despite unimpaired motor capacity.

    Conclusions:

    • Somatosensation, mediated by the trigeminal nerve, plays a crucial role in modulating the palatability of preferred tastes.
    • There is a distinct interaction between somatosensory and gustatory systems in the neural processing of food reward.
    • Trigeminal somatosensation specifically influences the positive hedonic impact of tastes, rather than general ingestive motor control.