Finally, four studies found differences for BDP only and not for UR compared to HC . Given the variability in paradigms, the lack of reproducibility, and the fact that these studies and tasks have been designed mostly for neuroimaging comparisons, it is difficult to draw firm conclusions from these data. Cognitive endopheno types are proposed for vulnerability to BD, however they still lack consistency and specificity. This might arise not only from the choice of task, but also from in the level of difficulty for example, of valence-specific deficits. Brain imaging may be a more sensitive tool to detect early alterations.