Spaced Versus Massed Alcohol Avoidance Task

Rationale: Alcohol-Avoidance Training (AAT) has been used successfully to strengthen avoidance-tendencies in patients with alcohol use disorder (AUD). AAT is already recommended in German clinical treatment guidelines as an evidence-based treatment for AUD and may be incorporated in the next revision of the Dutch clinical guidelines on AUD. Studies in other fields (semantic learning) suggest that spaced learning may be superior to massed learning, but this has not been studied with regard to AAT. Objectives: To compare the effectiveness of spaced versus massed AAT sessions. Study design: a two armed, randomised controlled trail. All participants will receive AAT in addition to routine clinical care in an inpatient setting (Treatment As Usual; TAU). AAT sessions in the experimental group (AAT-S) will be spaced out over four weeks following detoxification. Sessions in the control group (AAT-M) are massed within one week following detoxification. Assessments of alcohol consumption and craving take place before the start of AAT (baseline: T0, timeframe: last 30 days before admission (alcohol use) or past week (craving)) at three (T1) and six months follow-up (T2). Study population: 200 patients with a primary DSM-5 diagnosis of AUD who receive TAU at three addiction care sites (clinical facilities 'Zevenaar', 'Tiel' and 'Wolfheze') of IrisZorg. Patients have finished alcohol detoxification, age ≥ 18, have good Dutch proficiency and have given written informed consent. During the follow-up assessments they are likely to have progressed to regular outpatient addiction treatment. Intervention: During their four week (minimum) admission all participants receive TAU, which includes Community Reinforcement Approach (CRA) (Meyers \& Smith, 1995) grouptraining, AAT, sociotherapy and pharmacotherapy. AAT is a Cognitive Bias Modification paradigm that is used to retrain alcohol approach biases. In AAT participants must react to pictures of alcoholic and non-alcoholic beverag