| Summary: | 碩士 === 國立臺灣大學 === 心理學研究所 === 102 === Intolerance of uncertainty (IU) is one of the OCD-related dysfunctional beliefs, and is linked to compulsive checking. Desire for control (DC) and Sense of control (SC) might be involved in the effect of IU on compulsive checking. Specifically, high uncertainty circumstances might exert high DC and low SC for high IU individuals. Discrepancy between DC and SC would motivate compulsions to increase SC. Further, individuals with high OC tendencies showed illusion of control when completing their compulsions. Though it’s hard for individuals with OCD to experience conviction of their compulsive behaviors, IU would promote them to repeat their compulsions until the feeling of conviction was satisfied. Nevertheless, there has been little research aimed to explore the effect of IU on compulsive checking, neither was research directly addressed the effect of situational uncertainty on compulsive checking, nor was compulsions on subsequent SC and confidence of checking compulsions investigated. As such, this study explored the effects of IU and OC checking tendencies on the DC, SC, checking frequency, response time, and confidence after checking under high/low uncertainty circumstances. 209 participants performed the delayed matching-to-sample task, among which we chose those IUS score > 75, MOCI total score > 12, and checking subscale score > 5 to be the high IU high OC checking tendency group (n = 22), and IUS score < 54, MOCI total score < 8, and checking subscale score < 2 to be the low IU low OC checking tendency group (n = 23). Using these criteria, we screened 45 participants for data analysis. A series of 2 (IU_OCC group: high/low) x 2 (neutral/checking-relevant pictures) x 2 (high/low uncertainty circumstances manipulation) three way ANOVAs were conducted. High IU_OCC group showed higher DC, SC, and more checking behaviors, nonetheless, this group still revealed significant discrepancy between DC and SC. Furthermore, though all participants checked more frequently under high uncertainty circumstance, high IU_OCC group indicated lower confidence in their checking behaviors under this high uncertainty circumstance. High IU_OCC group exhibited longer response time for both the checking condition and same-pictures condition. Illusion of control in high IU_OCC group could be affected by their compulsion activity. The no differences regarding confidence of checking behaviors between the two groups might result from more frequent checking activity in high IU_OCC group. Nevertheless, high IU_OCC group still showed lower SC compared to DC which was discussed in terms of the elevated evidence requirements proposed by Tallis et al. (1991). We found that high IU_OCC group showed illusion of control. The present study also supported that IU is related to high DC. Given that illusion of control is short-lived, it could negatively reinforce individuals with OCD using more compulsions thereafter to enhance their SC. Therefore, we suggest that CBT therapists help patients with OCD to realize the elevated SC after their compulsions is not real, and assist individuals with high IU through Acceptance and Commitment Therapy to reduce their high DC.
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