Generalized Anxiety Disorder (GAD) is characterized by excessive and uncontrollable worry and anxiety. In Canada, the point prevalence of GAD is 3 to 4%, and the personal and social costs of GAD are well documented. Over the past decade, new cognitive-behavioural treatments have been developed for GAD. Our group has also developed a cognitive-behavioural treatment (CBT) protocol for GAD, which focuses on intolerance of uncertainty. There are now four published randomized clinical trials of the treatment, with results suggesting that it is more efficacious than wait-list control, supportive therapy, and applied relaxation. Although these results are encouraging, 30 to 40% of affected individuals do not attain diagnostic remission and 45 to 50% do not achieve high endstate functioning at post-treatment.

In an effort to augment the efficacy of the treatment protocol for GAD, we have recently examined a broad range of demographic and clinical variables that might predict a limited response to treatment. The results of our analyses suggest that a particular type of cognitive bias plays a key role in determining treatment response. Specifically, patients with a particularly negative interpretation style (i.e., the tendency to negatively interpret ambiguous information) have a greater probability of not attaining remission following CBT (they also show less improvement on other indicators of treatment outcome). In addition, change in interpretation style appears to mediate change in GAD symptoms over the course of CBT. Thus, the data suggest that treatment efficacy could be increased by adding training strategies that specifically address negatively biased interpretations of ambiguous information. Recently, a number of experimental investigations have shown that the tendency to negatively interpret ambiguous information can be decreased using computerized interpretation modification training. In fact, the data show that such changes can be maintained over time, can generalize to new situations, and can lead to corresponding changes in GAD symptoms and anxiety proneness. Thus, it appears that computerized interpretation modification training has the potential to increase the efficacy of current CBT protocols by directly targeting and decreasing the tendency to negatively interpret ambiguous information.

The proposed randomized clinical trial addresses the following question: Can computerized interpretation modification training augment the efficacy of CBT for GAD? A total of 138 individuals with a primary diagnosis of GAD will be randomly allocated to one of two conditions: a) CBT plus interpretation modification training (CBT+IMT) or b) CBT plus non-active training (CBT+NA). CBT will consist of 14 weekly 50-minute sessions targeting intolerance of uncertainty via procedures such as problem-solving training and imaginal exposure. Participants randomized to the experimental condition will receive 10 minutes of computerized interpretation modification training prior to each CBT session. In interpretation modification training, respondents learn to endorse benign combinations and reject negative combinations of sentences and words, thus promoting new associative learning. Participants in the control condition will receive 10 minutes of non-active training, in which each sentence is paired with a word that is unrelated to the sentence or a word that is related to a non-threatening (and typically peripheral) aspect of the sentence. Measures of GAD symptoms, psychopathology, cognitive vulnerability, and interpretation style will be administered at pre-, mid-, and post-treatment, as well as at 6- and 12-month follow-ups. The proposed study will provide information about the efficacy, clinical usefulness, and mechanisms of interpretation modification training in combination with CBT. Given previous findings on the key role of negative interpretation style in anxiety, the proposed study has the potential to increase our understanding and ability to treat individuals with GAD.