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A sample and hold amplifier system for stimulus artifact suppression

T L Babb, E Mariani, G M Strain

    Electroencephalography and Clinical Neurophysiology
    |April 1, 1978
    PubMed
    Summary
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    This study introduces a sample and hold amplifier system to eliminate stimulus artifacts in biological recordings, enabling clearer data interpretation during electrical stimulation. The system effectively suppresses artifacts, improving the analysis of electroencephalography (EEG) seizures.

    Area of Science:

    • Neuroscience
    • Biomedical Engineering
    • Signal Processing

    Background:

    • Electrical stimulation in biological recordings often generates stimulus artifacts.
    • These artifacts obscure crucial physiological data, hindering interpretation.
    • Existing methods struggle to effectively remove these artifacts, especially in real-time.

    Purpose of the Study:

    • To present a novel sample and hold amplifier system for artifact elimination.
    • To analyze factors prolonging stimulus artifacts and inform system design.
    • To demonstrate the system's efficacy in monitoring electroencephalography (EEG) during electrical stimulation.

    Main Methods:

    • Design and implementation of a sample and hold amplifier circuit.
    • Analysis of stimulus artifact characteristics and their impact on biological signals.

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  • Application of the artifact suppression circuit to EEG recordings during electrical stimulation.

    • Main Results:

    • The developed system effectively eliminates stimulus artifacts from biological recordings.
    • Artifact suppression allows for previously impossible interpretation of data during stimulation.
    • Successful demonstration of artifact suppression during EEG seizure monitoring.

    Conclusions:

    • The sample and hold amplifier system provides a robust solution for stimulus artifact removal.
    • This technology significantly enhances the quality and interpretability of biological data under electrical stimulation.
    • The system holds promise for advancing research and clinical applications involving electrical stimulation, particularly in epilepsy monitoring.