Delay Estimation Between EEG and EMG via Coherence with Time Lag

Kerry Mills1, Verity Mcclelland1, Yuhang Xu2, Zoran Cvetkovic3

  • 1King’s College Hospital
  • 2Kings College London
  • 3King's College London

Details

Category

Technical Session: Poster

Theme

Bio Imaging and Signal Processing

Sessions

13:30 - 15:30 | Tue 22 Mar | Poster Area J | BISP-P1

Processing of Electro-Physiological Signals

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Abstract

The traditional way to estimate the time delay between the motor cortex and the periphery is based on the estimation of the slope of the phase of the cross spectral density between motor cortex electroencephalogram (EEG) and electromyography (EMG) signals recorded synchronously during a motor control task. There are several issues that could make the delay estimation using this method subject to errors, leading frequently to estimates which are in disagreement with underlying physiology. This study introduces cortico-muscular coherence with time lag (CMCTL) function and proposes a method for estimating the delay based on finding its local maxima. We further address the issue of the interpretation of such time delay in multi-path propagation systems. Delay estimates obtained using the proposed method are more consistent compared with results obtained using the phase method and in a better agreement with physiological facts.

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