The primary aim of this study is to determine whether a computerized inhibitory control training (ICT) will improve CBT treatment outcomes for Bulimia Nervosa and Binge Eating Disorder.

This study involves a brief phone screen and baseline assessment to determine eligibility. Participants who are eligible for the study will receive 12 sessions of CBT treatment and will be randomly assigned to an ICT or ICT sham condition which will consist of completing ICT computer tasks on a daily basis during the first four weeks of treatment and booster sessions following treatment. Participants will also complete research assessments at mid-treatment, post-treatment, and 3-month follow-up intervals. Research assessments include a battery of questionnaires, computerized tasks, interviews, and behavioral tasks.

Inclusion Criteria:

• age 18-55
• meet DSM-5 criteria for Bulimia Nervosa (i.e., at least one episode of binge eating and compensatory behavior per week on average for the past 3 months) or Binge Eating Disorder (i.e., at least one episode of binge eating per week on average for the past 3 months).
• be stable on psychiatric medications for at least 3 months

Exclusion Criteria:

• have a diagnosis of anorexia nervosa or a BMI < 18.5
• have extreme malnutrition or other medical complications that require acute hospitalization
• are at acute suicide risk
• are currently experiencing other severe psychopathology that would require a more intensive or specialized treatment program than the current study provides (e.g. severe depression, active psychotic disorder)
• have previously completed a trial of CBT for Bulimia Nervosa or Binge Eating Disorder
• have a diagnosis of an intellectual disability or autism spectrum disorder
• currently taking stimulant medications
• score of 95% or higher on 550ms block of Go/No-Go assessment task, indicating high inhibitory control at Baseline

The investigators, therapists, and graduate student assessors will be blinded to treatment condition. The only staff member who cannot be blinded to condition is the study coordinator; she will be aware of condition because of managing randomization and assisting participants in the downloading of the intervention to participants' computers.