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El objetivo de este estudio experimental, controlado a doble ciegas, fue evaluar el efecto del White Chestnut sobre los pensamientos intrusos indeseados en una muestra de adultos supuestamente sanos que reportaron presentarlos de forma regular. La muestra quedó conformada por 70 participantes (47 mujeres y 23 hombres), con un rango de edad de 20-60 (36,42 ± 10,52) años, asignados aleatoriamente a 2 grupos: White Chestnut y placebo (n1= n2= 35). Para la evaluación de los cambios se utilizó el White Bear Suppression Inventory. Se observaron diferencias significativas intergrupos para la calificación global de la prueba [t (68)= -2,16, p< 0,05 y d= 0,51], con un predominio del factor que mide los pensamientos intrusos [t (68)= -2,84, p< 0,01 y d= 0,67]. Los resultados sugieren que el White Chestnut puede ser un efectivo recurso para la reducción de los pensamientos intrusos indeseados y que su acción es diferenciable del placebo.A controlled double-blind experimental study was conducted to evaluate the effect of white chestnut on unwanted intrusive thoughts in a sample of seemingly healthy adults who reported having these thoughts regularly. The sample was composed of 70 participants (47 women and 23 men) aged 20-60 (36.42 ±10.52), randomly assigned to one of two groups: white chestnut and placebo (n1=n2=35). The White Bear Suppression Inventory was used for change evaluation. Significant differences were found between the two groups in the global test score [t (68)= -2.16, p

Abstract Introduction Intrusive thoughts may cause a significant level of distress, since some individuals evaluate the content of those thoughts as aversive. Suppression of intrusive thoughts is one of the strategies adopted by these individuals, which increases the level of distress. Suppression of thoughts may be present as one of the factors that maintain different psychological disorders. Objective To describe the translation and adaptation into Brazilian Portuguese of the White Bear Suppression Inventory (WBSI), which measures thought suppression. Methods Three translations and back-translations were conducted by independent evaluators. Semantic equivalence was assessed and the three versions were evaluated to produce a synthesized version. Comments from participants on the preliminary version of the questionnaire were examined. Results We developed a preliminary Brazilian Portuguese version of the WBSI. It was found that most participants understood the descriptions of cognitions given in the translated questionnaire. Conclusion The use of three different versions of translations and back-translations, discussion of the synthetic version and interaction with the target population have conferred viability to the process of semantic equivalence of the Brazilian Portuguese final version of the WBSI.