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Related Experiment Videos

Steady-state visual evoked response amplitudes and concurrent electroencephalographic activity.

J E Fagan, F G Downard, R L Yolton

    American Journal of Optometry and Physiological Optics
    |June 1, 1985
    PubMed
    Summary

    Investigating visual evoked response (VER) amplitude variability, this study found that unrelated electroencephalographic (EEG) activity does not correlate with VER amplitude. However, EEG noise at the same frequency as VER could not predict trial-by-trial variations.

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    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Biomedical Engineering

    Background:

    • Steady-state visual evoked response (VER) amplitude variability is influenced by concurrent electroencephalographic (EEG) activity.
    • Two primary sources of EEG interference are identified: activity at frequencies different from the VER and activity at the same frequency (EEG noise).

    Purpose of the Study:

    • To evaluate the impact of concurrent EEG activity on steady-state VER amplitude variability.
    • To assess the effectiveness of indirect methods in estimating EEG noise underlying VER measurements.

    Main Methods:

    • Acquired 10 steady-state VERs (7.8 Hz pattern reversal) and 10 resting EEG samples from 20 normal subjects.
    • Calculated correlations between VER and concurrent EEG activity at different frequencies using Fourier analysis.

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  • Evaluated indirect techniques for assessing EEG noise, including adjacent frequency analysis and pre-VER EEG measurements.

    • Main Results:

    • No significant correlations were found between VER amplitude and concurrent EEG activity at frequencies other than the VER.
    • Indirect methods failed to predict trial-by-trial variations in EEG noise at the VER frequency (15.6 Hz).
    • Both indirect methods provided good estimates of the mean EEG noise across subjects.

    Conclusions:

    • Concurrent EEG activity at unrelated frequencies does not significantly affect steady-state VER amplitude.
    • Indirect methods are insufficient for predicting moment-to-moment VER amplitude fluctuations due to EEG noise.
    • Indirect methods can effectively estimate the average EEG noise level impacting VER measurements across a population.