Figure 4.
Non-linear regression analysis applied on real EEG signals according to a pair-wise procedure (AMY vs. EC (A), HIP vs. EC (B), AMY vs. HIP (C)), during the fast onset activity. Left, middle: h2 coefficient values are significantly high (**) compared to values measured during interictal periods. Time delays (solid line: upper signal vs. lower, dotted line: lower signal vs. upper) are stable. Direction index is lower than 0 indicating that lower signal is driving the upper signal. Right: Time delays are unstable and direction index stays close to 0, providing no clues about the direction of coupling.