The authors review the role of cognitive processes and mechanisms involved in the relationship between maladaptive aspects of perfectionism and psychological distress. A brief introduction to the concept of perfectionism is made, giving particular relevance to its multidimensional nature that encompasses positive and negative aspects. The later facets and its relationship with a broad range of ...

We explored whether transdiagnostic internet-delivered cognitive behavioural therapy (iCBT) for mixed anxiety and depression effectively reduces repetitive negative thinking (RNT), and whether reductions in RNT and positive metacognitive beliefs mediate symptom improvement during iCBT. Participants with generalized anxiety disorder (GAD), major depressive disorder (MDD), or mixed GAD/MDD diagno...

Given a universe of discourse U , a multiset can be thought of as a function M from U to the natural numbers N. In this paper, we define a hybrid set to be any function from the universe U to the integers Z. These sets are called hybrid since they contain elements with either a positive or negative multiplicity. Our goal is to use these hybrid sets as if they were multisets in order to adequate...