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Neurophysiological studies on conjoined twins.

J R Hughes, J J Fino

    Neuropediatrics
    |October 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Conjoined twins, despite lacking shared neural tissue, exhibited synchronized sleep patterns, suggesting a circulating sleep-promoting factor. Evoked potentials revealed unique responses, indicating complex inter-twin neural communication.

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    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Physiology

    Background:

    • Investigating neural connectivity and maturation in conjoined twins presents unique challenges.
    • Craniopagus twins, sharing cranial but not neural tissue, offer insights into shared physiological processes.
    • Premature birth in conjoined twins adds complexity to assessing neurological development.

    Observation:

    • Electroencephalography (EEG), visual evoked potentials (VEP), and brainstem auditory evoked potentials (BAEP) were used to assess neurological function.
    • Differences in EEG and BAEP latencies between twins suggested asynchronous cerebral and brainstem maturation.
    • Synchronous and near-synchronous sleep spindle activity between twins indicated a potential shared regulatory mechanism.

    Findings:

    • EEG showed one twin with higher amplitudes and less quiescence, suggesting a more mature cerebrum.

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  • The same twin exhibited longer BAEP latencies, indicating a less mature brainstem.
  • VEPs were distinct for each twin, with stimulation in one twin eliciting responses in the other characteristic of the *second* twin, suggesting non-volume conducted activation via physical contiguity.

    • Implications:

    • The findings support the hypothesis of a circulating sleep-promoting factor influencing synchronized sleep patterns in conjoined twins.
    • Evoked potential data suggest that neural activation in one twin can influence the other through pathways other than direct neural connection, possibly via shared vasculature or physical proximity.
    • This study provides a unique model for understanding inter-individual physiological regulation and neural communication in the absence of direct neural links.