 The core symptom of GAD is persistent and uncontrollable worry, which allows the individual a way to cognitively avoid perceived threats and emotionally dangerous situations. One study examined the efficacy of WE alone, applied relaxation AR alone, and a WL control group, finding that WE was an effective treatment for GAD, concluding that WE should be developed further. Given other areas of avoidance for patients with GAD, the authors recommended adding in vivo exposure in future trials. 