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Related Experiment Videos

Frequency following auditory brain stem responses in man.

F Huis in't Veld, P Osterhammel, K Terkildsen

    Scandinavian Audiology
    |January 1, 1977
    PubMed
    Summary
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    Recording auditory frequency following responses (FFR) is optimized using the Vertex electrode. This method minimizes contamination and simplifies interpretation for better auditory system analysis.

    Area of Science:

    • Neuroscience
    • Audiology
    • Auditory Evoked Potentials

    Background:

    • Frequency Following Response (FFR) recording is crucial for assessing auditory pathway function.
    • Electrode placement significantly impacts FFR signal quality and interpretation.
    • Existing methods face challenges with signal contamination and phase variability.

    Purpose of the Study:

    • To determine optimal electrode positions for reliable FFR recording.
    • To investigate the influence of stimulus parameters on FFR characteristics.
    • To propose a simplified and effective FFR recording protocol.

    Main Methods:

    • Comparison of FFR recordings using Vertex and mastoid electrode placements.
    • Evaluation of FFR phase and amplitude with varying stimulus frequencies (400 Hz, 500 Hz).

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  • Assessment of stimulus parameters, including tone-burst duration and rise-fall times.
  • Technique for eliminating artifact contamination via differential recording.

    • Main Results:

    • The Vertex electrode yields the largest FFR amplitude.
    • FFR phase relationships vary with stimulus frequency (in-phase at 400 Hz, out-of-phase at 500 Hz).
    • Vertex recordings are contaminated by early waves (Jewett waves); mastoid recordings show CM-like activity.
    • A 500 Hz tone-burst with specific rise-fall and plateau durations is highly effective.
    • Differential recording effectively removes artifact contamination.

    Conclusions:

    • Recommending the Vertex as the active electrode with neck reference for simplified FFR interpretation.
    • Optimal stimulus parameters enhance FFR amplitude and reduce adaptation issues.
    • Artifact removal techniques improve the fidelity of FFR measurements.