This paper introduces the validation of the Spanish adaptation of the White Bear Suppression Inventory (WBSI) by Wegner and Zanakos (1994). A sample of 833 people from the general population completed the WBSI along with other questionnaires. The exploratory factor analysis and the confirmatory factor analysis supported a two-factor solution accounting for 51.8% of the cumulative variance. This structure is comprised of the two following factors: unwanted intrusive thoughts (α = .87, r = .70) and actions of distraction and suppression of thoughts (α = .80, r = .60). Both internal consistency reliability (α = .89) and test-retest reliability (r = .71) showed adequate homogeneity, sound consistency, and stability over time. The results are discussed bearing in mind both isolated factors and the possible relationships of the suppression factor with automatic negative thoughts and insomnia.

Background: Comprehensive cognitive theories of obsessive compulsive disorder (OCD) propose that clinical obsessions and compulsions arise from specific sorts of dysfunctional beliefs and appraisals, such as inflated sense of responsibility, thought-action fusion (TAF), and thought suppression. Aims: The present study aimed to examine the mediator roles of responsibility and thought suppression between TAF and obsessive-compulsive symptoms. Specifically, it aimed to explore the relative effects of TAF factors (i.e. morality and likelihood) on inflated sense of responsibility and on thought suppression to increase the obsessive qualities of intrusions. Method: Two hundred and eighty-three Turkish undergraduate students completed a battery of measures on responsibility, thought suppression, TAF, OC symptoms, and depression. Results: A series of hierarchical regression analyses, where depressive symptoms were controlled for, indicated that TAF-morality and TAF-likelihood follow different paths toward OC symptoms. Although TAF-morality associated with inflated sense of responsibility, TAF-likelihood associated with thought suppression efforts, and in turn these factors increased OC symptoms. Conclusions: These findings provide support for the critical role of sense of responsibility and thought suppression between the relationship of TAF and OC symptoms. Findings were discussed in line with the literature.

Cognitive-behavioral models of obsessive compulsive disorder (OCD) assert that negative appraisals of obsessional thoughts lead to distress over the thoughts and drive ameliorative actions such as thought suppression and compulsions. These responses in turn play a role in the persistence of the disorder. However, past research has not examined (a) what factors lead individuals to suppress obsessional thoughts; (b) whether certain predictors and consequences relate to suppression uniquely or can be explained by general factors such as negative mood and neuroticism; or (c) individuals' natural active suppression of obsessions. The current study addresses these limitations by examining the roles of natural suppression and distress over thought intrusions in the thought-appraisal/OC symptoms relationship while controlling for general factors. Ninety-one nonclinical participants completed a variety of measures assessing theoretically relevant constructs. After their obsessional thought was primed, they recorded their thoughts for 6 minutes and then rated their suppression effort. Four hours later, longer-term outcomes were assessed. Path analyses supported most components of cognitive-behavioral models.

Impairment in mental control is a primary complaint of many sufferers of obsessive-compulsive disorder (OCD). Most OCD sufferers work very hard to rid themselves of their obsessions, to little avail. Although active resistance is a defining feature of obsessions, it is typically not assessed in measures of OCD severity and little is known about the frequency of attempts at thought control or its impact on functioning while control strategies are engaged. In the present study, 37 individuals diagnosed with OCD kept a diary of their suppression attempts over a 3-day period, recording the circumstances under which the attempt at suppression occurred, the suppression strategy used, its outcome, and its impact on concentration, mood, peace of mind, and ability to proceed with planned activities. Results indicated that individuals with OCD engage in frequent, strenuous, time-consuming and ultimately unsuccessful attempts to control thoughts. Suppression was used as a means of avoiding the hassles associated with experiencing an obsession and with performing a compulsive ritual. Consistent with other research, suppression was also used as a means of neutralizing harm potentiated by the obsession. These findings suggest that thought suppression efforts and their impact may contribute significantly to the severity of impairment associated with OCD, and that it might be useful for clinical and research purposes to evaluate suppression as a severity indicator.

Generally, the suppression of unwanted thoughts is found to be ineffective. Moreover, in the longer run, suppression attempts may backfire in that they produce a delayed increase in unwanted thoughts (i.e. a rebound effect). This ineffectiveness and paradox have been observed in various studies, and with various targets, such as neutral thoughts, obsessive intrusions, worries, addictive urges, and phobia-related cognitions. The present study sought to explore the effect of suppression of a different intrusion, namely a hallucination. Healthy undergraduates were exposed to a laboratory procedure that was to provoke hallucinations. Half of the participants were additionally given instructions to suppress the hallucinations. Results indicated that suppression was somewhat effective in the short run, but ineffective in the long run. However, no rebound effect was observed.

A literature search yielded no studies investigating Wegner's (1989) proposal that repeated suppression attempts and rebound opportunities (indulgence cycles) lead to an escalation of intrusions, providing a mechanism whereby an unwanted intrusive thought may develop into a clinical obsession. It was predicted, based on Wegner's (1994) ironic process theory of mental control, that individuals high in trait obsessionality would exhibit an increase in thought frequency as a function of indulgence cycle and that those low in trait obsessionality would display a corresponding decrease in thought frequency. Participants (N=40) were asked to suppress and then express a personally relevant obsessive intrusive thought through two indulgence cycles. There was no significant escalation in thoughts across indulgence cycles for the high obsessionality group, but the low obsessionality group were significantly more successful at suppression. The results confirm previous research suggesting that trait obsessionality has an impact upon the effectiveness of thought suppression.

The current study explored whether, consistent with Wegner's (1994) theory of ironic process of mental control, instructions to suppress rape-related thoughts would lead to paradoxical increases in the accessibility and distress associated with these thoughts. In order to minimize experimental artifacts, instructions and assessments were designed to be unobtrusive. Although no effects of suppression instructions on rape-related distress emerged, directed suppression was associated with a concurrent increase in heart rate. In addition, directed suppression led to a medium-sized effect of increased accessibility, although this effect was nonsignificant due to small sample size. Finally, individual differences in the tendency to suppress thoughts were associated with increased accessibility in the suppression condition, suggesting that thought control strategies may be particularly problematic when they are chronically employed.

Based on the relationship between cognitive intrusions and auditory hallucinations established by Morrison and Baker (2000) and Morrison, Haddock and Tarrier (1995) the present study examines the possible effect of the repeated suppression of self-discrepant thoughts on the vividness of auditory illusions in a sample from a non-clinical population. Sixty-one participants were randomly assigned to a suppression of thoughts group (n = 31) or a focalization of thoughts group (n = 30) with different levels of self-discrepancy. After carrying out the task over a period of 48 hours, participants were presented with non-vocal auditory stimulation and asked to state whether they heard any verbalizations, and if so, how clearly. Results show how the repeated suppression of self-discrepant thoughts has a considerable effect on the vividness of illusions (F(1, 50) = 16.09; p < 0.001). The implications of these results for psychological therapy are analysed, with special emphasis on the importance of a research line based on acceptance.

Inconsistent results have emerged in thought suppression studies using thought frequency counts as the primary dependent measure. In the present study, we used cognitive and emotional measures to assess the effects of suppressing negative self-referent and neutral thoughts. Although no between-group differences in cognitive outcomes emerged, participants in the negative self-referent thought condition experienced more anxiety, frustration, and hostility than did participants in the neutral thought condition. Affective measures appear necessary to assess the effects of suppressing personally relevant thoughts.

Previous research on vulnerability to Post-Traumatic Stress Disorder (PTSD) has been restricted by the absence of prospective studies that measure individual differences prior to traumatization. This study investigated the predictors of analogue post-traumatic intrusive cognitions using a fully prospective design. Non-patient participants completed a range of predictor measures before being exposed to a film about a traumatic fire. Film-induced changes in negative mood were also assessed. Subsequent intrusions were measured both within the experimental session and for a further seven days. The hypothesized predictors were: neuroticism, trait anxiety, extraversion, depression, a general tendency to suppress unpleasant thoughts, beliefs about being “at risk” from fire, mental imagery, self-rated proneness to intrusions and negative mood changes. The results showed that intrusions were predicted by film-induced increases in negative mood, thought suppression tendencies, beliefs about vulnerability to fire and self-rated proneness to intrusive cognitions. The findings are discussed in relation to the literature on thought suppression and cognitive processes in PTSD.