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Infant Auditory Processing and Event-related Brain Oscillations

Infant Auditory Processing and Event-related Brain Oscillations

Published on: July 1, 2015

High-Frequency Oscillations in the Normal Human Brain.

Birgit Frauscher^1,2, Nicolás von Ellenrieder¹, Rina Zelmann^1,3

¹Montreal Neurological Institute and Hospital, McGill University, Montreal, Quebec, Canada.

Annals of Neurology

|July 28, 2018

Summary

This summary is machine-generated.

This study establishes region-specific normative values for physiological high-frequency oscillations (HFOs) and high-frequency activity (HFA). These values help differentiate pathological HFOs, crucial for identifying the epileptogenic zone.

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Area of Science:

Neuroscience
Epileptology
Biomarkers

Background:

High-frequency oscillations (HFOs) are potential biomarkers for the epileptogenic zone.
Differentiating physiological from pathological HFOs remains challenging.
Baseline HFO rates vary significantly across brain regions.

Purpose of the Study:

Establish region-specific normative values for physiological HFOs and high-frequency activity (HFA).
Provide a reference for identifying pathological HFOs.
Enhance the utility of HFOs as biomarkers for the epileptogenic zone.

Main Methods:

Analysis of stereo-encephalographic recordings from nonlesional tissue in 71 patients from two epilepsy centers.
Automatic detection of ripples (80-250Hz), fast ripples (>250Hz), and HFA (>80Hz) during N2/N3 sleep.
Provision of normative values for 17 distinct brain regions.

Main Results:

1,171 bipolar channels with normal physiological activity were analyzed.
Highest ripple rates observed in occipital cortex, temporal regions, and pre/postcentral gyri.
Physiological fast ripples were rare (mean rate 0.038/min), with only 5% of channels exceeding 0.2/min.

Conclusions:

The first multicenter atlas providing region-specific normative values for physiological HFOs and HFA.
Rates exceeding these normative values can now be classified as pathological.
Rare physiological fast ripples are strong candidates for defining the epileptogenic zone.