Comparison of univariate and multivariate magnitude-squared coherences in the detection of human 40-Hz auditory steady-state evoked responses

Publication date: February 2018 Source:Biomedical Signal Processing and Control, Volume 40 Author(s): Leonardo Bonato Felix, Felipe Antunes, Jean Antônio da Silva Carvalho, Márcio Falcão dos Santos Barroso, Antonio Mauricio Ferreira Leite Miranda de Sá Objective response detection (ORD) techniques for evaluating bioelectrical evoked responses in the electroencephalogram (EEG) are based on statistical criteria rather than on visual inspection. Hence, they do not depend on human evaluation, which is often a subjective approach. Furthermore, since such techniques do not involve heuristic approaches, they may be more easily implemented and used in automatic systems. The Magnitude-Squared Coherence (MSC), together with its recently developed multivariate extension (the multiple magnitude-squared coherence – MMSC), have been pointed out as one of the most efficient ORD techniques for detecting steady-state responses in the EEG. In this work, both MSC and MMSC were applied to EEG signals collected during auditory stimulation in order to allow comparison in the detection of auditory steady-state responses (ASSRs). The stimuli consisted of 40Hz amplitude-modulated tones delivered binaurally in the intensity of 50dB SPL (sound pressure level). The best result was obtained by using MMSC in the two-electrode set C4 and Fz. This configuration led to a 0.92-detection ratio, within 111.55s in average to detect each response and kept the false alarm ratio under 0.05. The average...
Source: Biomedical Signal Processing and Control - Category: Biomedical Science Source Type: research