Improving the detection of evoked responses to periodic stimulation by using bivariate local spectral F-test – Application to EEG during photic stimulation

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Improving the detection of evoked responses to periodic stimulation by using bivariate local spectral F-test – Application to EEG during photic stimulation Leonardo Bonato Felix, Paulo Fábio Rocha, Eduardo Mazoni Andrade Marçal Mendes, Antonio Mauricio Ferreira Leite Miranda de Sá Medical Engineering and Physics Volume 48, Pages 176-180 (October 2017) DOI: 10.1016/j.medengphy.2017.06.032 Copyright © 2017 IPEM Terms and Conditions

Fig. 1 Theoretical critical values for Fy2y1(fo) (dashed line) and Fy(fo) (continuous line) as a function of L. Medical Engineering and Physics 2017 48, 176-180DOI: (10.1016/j.medengphy.2017.06.032) Copyright © 2017 IPEM Terms and Conditions

Fig. 2 Curves for PD of responses using Fy2y1(fo) (dashed lines) as a function of SNR and for different L-values. PD using Fy(fo) is also shown as continuous lines. Medical Engineering and Physics 2017 48, 176-180DOI: (10.1016/j.medengphy.2017.06.032) Copyright © 2017 IPEM Terms and Conditions

Fig. 3 Probability of detection with Fy2y1(fo) for different SNRs in y1[k] and y2[k] for L = 16. The curves in the xy-plane are contour curves for PD = 0.25, 0.35, 0.55, 0.75 and 0.95. Medical Engineering and Physics 2017 48, 176-180DOI: (10.1016/j.medengphy.2017.06.032) Copyright © 2017 IPEM Terms and Conditions

Fig. 4 Contour curves of the 3D-plot shown in Fig. 3 for PD = 0.25 to 0.95 in steps of 0.20. PD with a single channel (y1[k]) is also plotted in dashed line with y-axis at right side to show the corresponding SNR in such signal (9 dB) that leads to 95%-detection rate. Based on this value, the threshold of ∼4 dB is found for the SNR in y2[k] that results in detection improvement if both signals are employed. Medical Engineering and Physics 2017 48, 176-180DOI: (10.1016/j.medengphy.2017.06.032) Copyright © 2017 IPEM Terms and Conditions

Fig. 5 False alarm ratio for Fy2y1(fo) (with squares) and for Fy(fo) (with asterisks). Medical Engineering and Physics 2017 48, 176-180DOI: (10.1016/j.medengphy.2017.06.032) Copyright © 2017 IPEM Terms and Conditions

Fig. 6 Probability of detection (PD) with Fy2y1(fo) as a function of the correlation level between the background noises in 5 dB SNR signals (continuous line). PD-value with Fy(fo) in a single channel with same SNR is shown in dashed line to allow comparison. Medical Engineering and Physics 2017 48, 176-180DOI: (10.1016/j.medengphy.2017.06.032) Copyright © 2017 IPEM Terms and Conditions