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This parallel randomized controlled trial aimed to evaluate the effect of acceptance and commitment therapy (ACT) focused on disrupting repetitive negative thinking (RNT) versus a waitlist control (WLC) in the treatment of depression and generalized anxiety disorder (GAD). Forty-eight participants with a main diagnosis of depression and/or GAD were allocated by means of simple randomization to a 2-session RNT-focused ACT intervention or to the WLC. The primary outcomes were emotional symptoms as measured by the Depression, Anxiety, and Stress Scales–21. Process outcomes included ACT- and RNT-related measures: general RNT, experiential avoidance, cognitive fusion, values, and generalized pliance. At the 1-month follow-up, linear mixed effects models showed that the intervention was efficacious in reducing emotional symptoms (d = 2.42, 95% confidence interval [1.64, 3.19]), with 94.12% of participants in the RNT-focused ACT condition showing clinically significant change in the Depression, Anxiety, and Stress Scales–21 total scores versus 9.09% in the WLC condition (70% vs. 8% in intention-to-treat analysis). The intervention effects were maintained at the 3-month follow-up. No adverse events were found. A very brief RNT-focused ACT intervention was highly effective in the treatment of depression and GAD.

Título: Validez del Penn State Worry Questionnaire-11 en Colombia y equivalencia factorial a través de género y muestras clínicas y no clínicas. Resumen: El Penn State Worry Questionnaire (PSWQ) es la medida principal de la preocupación inespecífica que caracteriza al trastorno de ansiedad generalizada (TAG). Este estudio explora la validez del PSWQ en Colombia y su invarianza de medida entre género y participantes clínicos y no clínicos. Se utilizó la versión abreviada de 11 ítems del PSWQ propuesta por Sandín, Chorot, Valiente y Lostao (2009) porque los ítems redactados negativamente han mostrado ser problemáticos para los hispanohablantes. Adicionalmente, la investigación ha sugerido que los ítems redactados en negativa carecen de utilidad práctica. El PSWQ-11 se administró a un total de 1045 participantes, incluyendo una muestra de participantes no clínicos (N = 710) y una muestra de participantes clínicos (N = 335). La consistencia interna del PSWQ-11 a través de muestras fue excelente. El modelo de un factor mostró un ajuste aceptable a los datos. Se observó invarianza métrica y escalar a través de género y muestras clínicas y no clínicas. En conclusión, el PSWQ-11 parece ser una medida válida de la preocupación tipo TAG, mientras que los datos sobre equivalencia factorial permiten la comparación de puntuaciones a través de género y participantes clínicos y no clínicos.Abstract: The Penn State Worry Questionnaire (PSWQ) is the gold standard measure of the unspecific worry that characterizes generalized anxiety disorder. This study aims to explore the validity of the PSWQ in Colombia and its measurement invariance across gender and clinical and nonclinical participants. An abbreviated, 11-item version of the PSWQ by Sandín, Chorot, Valiente, and Lostao (2009) was used because the negatively worded items have shown to be problematic for Spanish speakers. Additionally, research has suggested that the negatively worded items of the PSWQ lack of practical utility. The PSWQ-11 was administered to a total of 1045 participants, including a sample of nonclinical participants (N = 710) and a sample of clinical participants (N = 335). The internal consistency of the PSWQ-11 across samples was excellent. The one-factor model showed an acceptable fit to the data. Metric and scalar invariance were observed across gender and clinical and nonclinical samples. In conclusion, the PSWQ-11 seems to be a valid measure of GAD-related worry in Colombia, whereas data on factorial equivalence data warrant the comparison of scores across gender and clinical and nonclinical samples.

Mindfulness has been widely disseminated in clinical psychology in recent years, due to the positive effects on treating several psychological issues in diverse population. Nonetheless, empirical research and theoretical reviews show three different meanings of mindfulness within behavioral approaches: as a process, as skill, and as a strategy. Discrepancies about mindfulness definitions have brought ambiguity to what and how this phenomenon is studied. A conceptual analysis of mindfulness according to behavioral-analytic and functionalcontextualistic philosophical traditions is presented. Finally, it was discussed the relevance of employing a precise and consensual definition of mindfulness to develop a coordinated research agenda in this field. Clinical psychology has shown a growing interest in mindfulness, given the positive effect of this intervention in different types of disorders and psychological problems, such as: mood disorder, binge eating disorder, anxiety and stress