Figure 1

Examples of EEG signals from a migraine patient. From top to bottom: the signal from F1 electrode under 9 Hz flash stimulation; from F2, 9 Hz stimuli; from F1 in spontaneous conditions; from F2, spontaneously. The full records are 40 sec long, only 4 sec segments are shown. Signals are filtered in the alpha band.Reuse & Permissions

Figure 2

(a) Application of FDR method. The vertical axis represents the probability that the 30 $\Gamma$ values of patients and controls were drawn from the same distribution, according to the paired $t$ test. Frequencies 9-24-27 Hz are selected with false positive rate $0.05$. (b) The probability that the 30 $\Gamma$ values of patients and controls were drawn from the same distribution is now evaluated according to the Wilcoxon rank sum test. FDR selects frequencies 9-24-27 Hz with a false positive rate $0.05$. (c) FDR is applied to select separating electrodes, for 9 Hz flash stimuli. The vertical axis represent the probability that the 30 ${\Gamma }_s$ values of patients and controls, for each sensor $s$, were drawn from the same distribution, according to the paired $t$ test. The labels for electrodes correspond to the international 10-20 system. (d) As in (c) for 24 Hz flash stimuli.Reuse & Permissions

Figure 3

In the case of 24 Hz stimuli, the mean of ${\Gamma }_s$ (over patients and over controls) is represented for all the 18 electrodes. On the average, phase synchronization increases for patients and decreases for controls.Reuse & Permissions

Figure 4

Histogram of the phase difference for the pair T3-T5. (a) A healthy person without stimuli. (b) The same healthy person in presence of 9 Hz stimuli. (c) A patient without stimuli. (d) The same patient in presence of 9 Hz stimuli.Reuse & Permissions

Figure 5

Time evolution of $\Delta \Phi$ (i.e., the phase difference ${\phi }_1-{\phi }_2$, without wrapping in the interval $[-\pi ,\pi ]$) for the pair F1-F2. From the top to the bottom: for a migraine patient (the same patient as in Fig. 1) in the presence of 9 Hz stimuli; for the migraine patient without stimulation; for a control in presence of 9 Hz stimuli; for the control without stimulation.Reuse & Permissions