“…One could concern that this companion variation may simply reflect a general autonomic activity sustained by subcortical network activation, as observed in a typical startle response (in that, a stimulus approaching toward the face), being thus unrelated to PPS perturbation. Nonetheless, the motor tasks we employed require at least one or more among physical, psychological, and mental effort to be executed, depending on the hand‐to‐face distance (for purposeful or reflex actions to be eventually planned and executed), the comfort distance (for potential interactions with the experimenter within participant's PPS), judgments toward stimuli while during passive or active task—namely participant's or experimenter's hand (Ferri, Ardizzi, Ambrosecchia, & Gallese, 2013; Iachini, Coello, Frassinetti, & Ruggiero, 2014; Proulx, Todorov, Taylor Aiken, & de Sousa, 2016). Therefore, HR changes may represent a specific marker of PPS perturbation.…”