 Participation in this study will last 12 weeks, and follow-up assessments will last for 6 months. At study entry, participants will complete a brief intelligence test and an in-person interview about their medical history, psychiatric history, and hair pulling. At their second visit, participants will have digital pictures taken of their hair-pulling sites and complete two computer tasks measuring their response inhibition and cognitive flexibility. After the second visit, participants will be randomly assigned to receive either AEBT or psychoeducation and supportive therapy PSTa standard treatment for TTM. Both treatments will involve ten 1-hour sessions completed over 12 weeks. Assessments of participants will occur after 6 weeks of treatment, at treatment completion, and after 6 months. These assessments will measure treatment effectiveness, based on several clinical scales and measures of TTM symptoms. Participants who receive PST during this study will be offered AEBT afterward. 