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Related Experiment Videos

'Limbic spindles': a re-appraisal

J Engel, S Jerrett, E Niedermeyer

    Electroencephalography and Clinical Neurophysiology
    |March 1, 1978
    PubMed
    Summary
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    Respiration-linked spindles, previously thought to be brain activity, are likely artifacts. These signals may result from palatal vibrations caused by breathing issues and unstable electrode placement.

    Area of Science:

    • Neurology
    • Sleep Medicine
    • Biomedical Engineering

    Background:

    • Nasopharyngeal electrodes are commonly used to record respiration-linked spindles.
    • These spindles have been interpreted as indicative of neuronally generated limbic activity.
    • The precise origin and significance of these recorded signals remain a subject of investigation.

    Purpose of the Study:

    • To investigate the origin of respiration-linked spindles recorded from nasopharyngeal electrodes.
    • To determine if these spindles represent genuine neuronal activity or are artifactual.
    • To explore the potential role of electrode contact and airway dynamics in signal generation.

    Main Methods:

    • Analysis of recordings from both sphenoidal and nasopharyngeal electrodes.

    Related Experiment Videos

  • Correlation of spindle occurrence with respiration and airway patency.
  • Assessment of electrode stability and potential for artifact generation.

    • Main Results:

    • Evidence suggests that respiration-linked spindles are artifactual in nature.
    • Unstable electrode contacts were identified as a key factor in signal generation.
    • Palatal vibration during partial airway obstruction appears to produce these artifactual signals.
    • The findings challenge the interpretation of these spindles as limbic activity.

    Conclusions:

    • Respiration-linked spindles recorded via nasopharyngeal electrodes are likely artifacts.
    • The artifact is attributed to the recording of palatal vibrations.
    • This phenomenon is associated with unstable electrode contacts and partial airway obstruction.
    • Re-evaluation of previous interpretations of these signals is warranted.