tDCS and Urge in BFRBs

tDCS will be delivered for 13 minutes (active) or only at the beginning and end of the 13 minute period (sham) using Neuroelectrics Instrument Controller software and a battery-driven Starstim 8-channel transcranial direct current stimulator with 1cm2 ceramic electrodes and SIGNAGEL conductive saline gel.

Participants will undergo three, twenty-second trials of exposure to individualized cues at the top of the established urge hierarchy, previously determined to precede picking or biting behaviors before and after tDCS.

Participants will be left in the testing room without access to a cellphone or reading materials for 2 different 6 minute periods.