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The "third rhythm": further observations.

E Niedermeyer1

  • 1Department of Neurological Surgery, Johns Hopkins School of Medicine and Hospital, Baltimore, MD.

Clinical EEG (Electroencephalography)
|April 1, 1991
PubMed
Summary
This summary is machine-generated.

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Researchers identified a distinct "third rhythm" in the temporal lobe, separate from known brain rhythms. This physiological brain activity is typically undetectable on scalp recordings.

Area of Science:

  • Neuroscience
  • Electrophysiology

Background:

  • Previous observations suggested an alpha-like rhythm in the temporal lobe.
  • This rhythm, termed the "third rhythm," is distinct from posterior alpha and central mu rhythms.
  • It is generally undetectable via scalp electrodes but can manifest as a "breach rhythm" over bone defects.

Observation:

  • A young adult undergoing assessment for temporal lobectomy provided an opportunity to study the "third rhythm" using epidural electrodes.
  • Two types of rhythmical alphoid activity were observed.
  • One type was anterior, more prominent on the left hemisphere, and sometimes visible on scalp electrodes, considered potentially abnormal.

Findings:

  • A second type of rhythmical activity was maximal in the mid-temporal lobe, more pronounced on the right side.

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  • This physiological "third rhythm" was largely undetectable with scalp leads.
  • The responsiveness of this rhythm is not fully understood, though attenuation was noted during singing on the right side.

    • Implications:

    • This study differentiates a physiological "third rhythm" from abnormal temporal lobe activity.
    • Understanding this rhythm could refine electrophysiological assessments in neurological conditions.
    • Further research is needed to elucidate the functional significance and responsiveness of the physiological "third rhythm".