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Three primitive reflexes in normal adults

L Jacobs, M D Gossman

    Neurology
    |February 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Primitive reflexes like the palmomental, snout, and corneomandibular are common in healthy adults. These reflexes appear with age, with the palmomental reflex being the most frequent.

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    Area of Science:

    • Neurology
    • Geriatrics
    • Human Physiology

    Background:

    • Primitive reflexes are typically present in infants and disappear with development.
    • The persistence or reappearance of these reflexes in adults may indicate neurological changes.
    • Understanding the prevalence of primitive reflexes in healthy aging is crucial for distinguishing normal from pathological findings.

    Purpose of the Study:

    • To investigate the prevalence and age-related patterns of three primitive reflexes (palmomental, snout, corneomandibular) in a healthy adult population.
    • To determine if these reflexes are normal phenomena in aging individuals.

    Main Methods:

    • The study involved 105 healthy subjects across the third to ninth decades of life.
    • Three primitive reflexes were systematically elicited in all participants.

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  • Data on the presence and type of elicited reflexes were recorded for each subject.

    • Main Results:

    • 50.5% of subjects exhibited at least one of the three primitive reflexes.
    • The palmomental reflex was the most frequent and appeared earliest.
    • The snout and corneomandibular reflexes appeared later and less frequently, with corneomandibular often co-occurring with the others.

    Conclusions:

    • The presence of palmomental, snout, and corneomandibular reflexes is a normal finding in a significant portion of the healthy adult population.
    • These reflexes demonstrate a patterned emergence with advancing age.
    • Their presence does not necessarily indicate pathology in the elderly.