Procedure
Prior to participation, participants were instructed to shave their forearm and calf to prevent hair movement that could interfere with any tactile stimulation. Participants provided details of their age, sex, and handedness. We assessed pupil responses to tactile stimulation at each of three body locations: the tip of the right little finger, the right forearm, and the right calf. In addition, we assessed subjective tactile sensitivity for the same three body locations using Von Frey filaments. The order of the pupillometry assessment and the subjective tactile sensitivity assessment was counterbalanced between participants.