Relationship between mean heart rate (computed trial-wise) and behavioural results. 3A–3B. Heart rate and response. 3A presents the pattern of responses by video duration, split into trials with below or above-average heart rate compared to other trials of the same participant and duration. 3B presents the bivariate correlation between (normalized) mean heart rate and response. 3C–3D show analogous results concerning error size: descriptive pattern with dichotomized heart rate (3C) and scatter plot with Pearson’s correlation (3D).