Depression represents a pervasive and devastating psychological difficulty. It affects over 21% of the population at some point in their lives and can have an unimaginable impact on both individuals and society. Behavioural activation represents a popular intervention for depression and is commonly used by psychologists internationally. Despite its popularity, the cognitive mechanisms underpinning the efficacy of behavioural activation remain elusive. This paper will review the literature on this intervention and propose an account of the cognitive mechanisms underlying its therapeutic efficacy. Specifically, it is argued that behavioural activation is effective because it increases both the density of outcomes in ones environment and the density of highly salient action-outcome contingencies, which may otherwise be absent due to reduced motivation. The clinical implications are subsequently discussed, with reference to future research.
Introduction: A cross-sectional descriptive study was conducted to evaluate the factor structure of Spanish translation and adaptation of the Cognitive Flexibility Inventory (CFI) in a sample of Colombian adults.
Method: The sample of the study was n = 968. Respondents were aged between 18 and 52 years old (Mage=22.81, SD=4.42). Descriptive analyses, confirmatory factor analysis, and Cronbach's Alpha calculation were carried out.
Results: Internal consistency for the global scale was high (α=.89). Likewise, the coefficients of the Alternative factor and the Control factor were similar (α=.90, 95% CI=.89-.90 and α=.83, 95% CI=.81-.85, respectively). A two-factor structure performed best according to the results of model selection criteria. This model suggested the existence of two correlated factors, with correlated items within factors (Item19 Item20 and Item8 Item10).
Conclusions: Overall, the results suggest that the CFI scale exhibits construct validity and adequate reliability, both for the general scale and the subscales in the Colombian sample, enabling their use in contexts such as clinical or research.

