Abstract
Background: As one of the founding principles of Acceptance and Commitment Therapy (ACT), cognitive defusion is a contextual control of language, but it is not clear which behavioural process would allow such defusion. Two experiments are presented which analyse that process using a word repetition exercise. Method: Experiment 1 was performed with 30 randomised participants, using a factorial between-groups (4x2) with repeated measures design: Group 1 = milk-milk-milk exercise; 2 = emotional word repetition; 3 = milk-to-emotional word shaping; and 4 = control without intervention. Questionnaires were applied on thoughts, emotional regulation, and experiential avoidance, in addition to the evaluation of 20 images suggesting emotions. In Experiment 2, 78 participants were randomised using the same 4x2 design, and also 60 images with a proven emotional reactivity were used. Results: Experiment 1 did not show changes in any of the variables, nor a decrease in emotional assessment, which should occur according to the theory behind ACT. In Experiment 2, no significant changes between the groups and no pre-post changes appeared, except in latency time. Conclusions: The lack of replication of the defusion process is discussed, along with the mixed results of other studies.
