Quantifying the Relative Contributions of Divisive and Subtractive Feedback to Rhythm Generation
Figure 5
Variations of the contributions of s and θ with τθ/τs.
A. Contributions of s to episode termination (CsAP, red, diamonds) and initiation (CsSP, blue, stars). B. Contributions of θ to episode termination (CθAP, red, diamonds) and initiation (CθSP, blue, stars). C. Both sums CsAP + CθAP (red, diamonds) and CsSP + CθSP (blue, stars) are close to 1, demonstrating the consistency of the measures. D. Combined measures CAP (red, diamonds) and CSP (blue, stars), as defined in Eq 11–12, superimposed with the prediction from the correlative measure c (dashed curve, as in Figure 1C). CAP≈−1: θ controls the active phase; CAP≈0: both θ and s have equal contributions to setting the duration of the active phase; CAP≈1: s controls the active phase (and similarly for CSP and the silent phase). Variations of CAP show that the relative contribution of s to the termination of the active phase increases with τθ/τs, in agreement with the correlative approach. On the other hand, CSP remains close to -1, showing that the subtractive process (θ) controls episode onset over the whole range.