Abstract Objective: The word repetition technique is used in
acceptance and commitment therapy as a method of facilitating
cognitive defusion from distressing thoughts. The present
study conducted a randomised trial to manipulate the rate of
word repetition and evaluate its impact on the efficacy of
cognitive defusion. Method: Thirty-two participants repeated
a self-chosen negative self-evaluative word for 30 seconds at
the rates of one word per 0.5-, 1-, or 2-seconds. Visual analogue
scales were used to measure the associated levels of
believability and discomfort at pre- and immediately
postrepetition, and 1 month later. Results: Both believability
and discomfort were significantly reduced immediately after
word repetition in the 0.5-seconds and 1-second conditions.
There was a significantly greater reduction in Discomfort in
the 1-second condition in comparison to the 2-second condition.
The 1-second condition alone maintained significant reductions
in both believability and discomfort at 1-month
follow up. Conclusion: Differences in the cognitive defusion
of distressing thoughts appear to be influenced by word repetition
rate with repetition rates of one word per 0.5 and 1 seconds
somewhat more effective for treating distressing private
experiences associated with problem words.