Figure 4.

Fitted model parameters and RMSE for averaged trials for each condition at 85 bpm (n = 80 baseline trials, n = 10 perturbation trials per condition). α (A) represents the strength of phase coupling, or how strongly the stimulus affects the phase of the model's behavior. β (B) represents the strength of the period coupling. On average, the magnitude of phase coupling was 20 times stronger than the magnitude of the period coupling, suggesting that Ronan is primarily using phase adaptation to match the stimulus. Also of note is that α is strongly affected by perturbation magnitude. RMSE (C) is the root mean squared error of the fitted model compared to Ronan's behavior.