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.