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Channel interpolation in TMS-EEG: a quantitative study towards an accurate topographical representation.

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    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |March 9, 2017
    PubMed
    Summary

    Accurate reconstruction of artifacted channels in transcranial magnetic stimulation combined with electroencephalography (TMS-EEG) is vital. High-density EEG montages offer lower global reconstruction error at fixed latencies for TMS-EEG signal analysis.

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    Area of Science:

    • Neuroscience
    • Biomedical Engineering
    • Signal Processing

    Background:

    • Transcranial magnetic stimulation combined with electroencephalography (TMS-EEG) is a key technique for investigating brain function.
    • Artifacts in TMS-EEG signals can compromise the accuracy of cortical mechanism exploration.
    • Accurate reconstruction of artifacted channels is essential for reliable topographical mapping and inverse problem solutions.

    Purpose of the Study:

    • To evaluate the performance of two different interpolation methods for artifacted TMS-EEG channels.
    • To compare reconstruction accuracy between low-density (19-channel) and high-density (60-channel) EEG montages.
    • To assess performance in global TMS Evoked Potential (TEP) averaging versus fixed latency analysis.

    Main Methods:

    • Investigated two distinct interpolation methods for artifacted TMS-EEG data.
    • Utilized two datasets with differing spatial resolutions: 19-channel (low-density) and 60-channel (high-density) EEG.
    • Evaluated performance across two analysis contexts: averaged TMS Evoked Potentials (TEPs) and fixed latencies (100 ms, 300 ms).

    Main Results:

    • The global reconstruction error was found to be lower for the high-density electrode montage.
    • This improved accuracy was particularly evident at fixed latencies (100 ms and 300 ms) post-stimulation.
    • The study identified differences in interpolation performance based on spatial resolution and analysis context.

    Conclusions:

    • High-density EEG montages provide more accurate global reconstruction of TMS-EEG signals, especially at specific latencies.
    • The choice of interpolation method and analysis strategy impacts the reliability of TMS-EEG signal processing.
    • Optimizing channel reconstruction is crucial for precise mapping of brain responses following TMS.