Figure 6.

Dynamics of temporal coherence. A, Ongoing activity measured during silence, from the low-frequency region of core area AI (black trace) and the low-frequency region of core area DC (blue trace). B, The corresponding ongoing activity traces from A are bandpass-filtered (FIR filter; ±0.5 Hz around the center frequency of 4 Hz, length of 1 s) and the resulting waveforms plotted. Next, these signals were convolved with a 4 Hz Morlet wavelet. The resulting magnitudes were summed and correspond to the envelope that is plotted. C, The instantaneous phase (Φ) difference between the traces from AI and DC, following 4 Hz wavelet analysis.