Longitudinal effects of cognitive fusion in depressive and anxious symptoms of family caregivers of people with dementia.

Family dementia caregiving has been commonly associated with psychological distress for caregivers. Cognitive fusion, that is, the tendency to become too entangled in thoughts, beliefs, or judgments (in the absence of objectivity) that may often lead to rigid thinking and impact psychological distress, is a transdiagnostic and central process of psychological inflexibility. Cross-sectional studies have shown that family caregivers of people with dementia who could present high levels of stress may be vulnerable to experiencing psychological symptoms such as depression and anxiety (even comorbidity) if they present this rigid way of thinking without seeing the objectivity of their thoughts, which could be related to aspects of the family member's dementia or helplessness in being a caregiver, for example. Specifically, studies in the caregiving field, as well as in other populations, suggest that cognitive fusion could play a mediating role in the relationship between stress and psychological symptoms. However, the predictive role of caregivers' cognitive fusion on psychological distress has not been analyzed in longitudinal studies. The objective of this study was to analyze the longitudinal effect of cognitive fusion in depressive and anxious symptoms after controlling for other relevant variables in a sample of Spanish family caregivers. Face to face assessments were conducted with a total of 176 Spanish family dementia caregivers. The study involved three assessments in a two-year period (baseline, 12 and 24 months). Linear mixed model analysis was used to analyze the associations between time-varying values of frequency and reaction to care-recipient behavioral problems, cognitive fusion, and caregivers' depressive and anxiety symptoms. Increases in cognitive fusion significantly predicted depressive and anxious symptoms (p < 0.01). In addition, reaction to care-recipients’ behavioral problems and being a female caregiver predicted increases in anxiety symptoms over time (p < 0.05). These results suggested that cognitive fusion may constitute a core dysfunctional mechanism involved in depressive and anxious symptoms. Psychological strategies aimed at reducing cognitive fusion and stress levels may be especially helpful for reducing caregivers' distress.