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Phase-Coherence Transitions and Communication in the Gamma Range between Delay-Coupled Neuronal Populations

Figure 5

Phase coherence and time shift behavior in the case of bidirectional symmetric coupling for increasing inter-areal axonal delays .

(A) Frequency (black arrow) at which the power spectrum is maximum and extent of the gamma peak (gray bar) (results for only one population are shown, since they are the same for both populations). (B) Frequencies at which the phase coherence exhibits local maxima, . (C) Phase coherence, in color code, as a function of frequency (y-axis) and of the inter-areal axonal delay (x-axis). (D) Time shift at the peak frequency of the power spectrum. (E) Time shift at , the frequencies labeled in (B). The red line corresponds to . The labels in panels B and E correspond to panels of Figure 4. (F) Time shift , in color code, as a function of frequency (y-axis) and of the inter-areal axonal delay (x-axis). The solid black lines in panels C and F show (as in panel B) and the dashed black line represents the power spectrum maximum within the gamma range shown in panel A. In plots A, B, and C the total extent of the gamma peak is displayed as a vertical gray bar. In plot D, the arrows point at the gamma period and half of it, being . The measures are averaged over trials for each .

doi: https://doi.org/10.1371/journal.pcbi.1003723.g005