The prefrontal cortex (PFC) plays an important role in emotion regulation. In line with this it has been shown that patients with reduced emotion regulation ability display impaired functioning of the PFC. Aim of the study is to train patients to consciously upregulate activity in the PFC and thereby to increase emotion regulation ability. On the behavioral level this is expected to correlate with a reduced experience of negative mood. In order to regulate the PFC, participants are instructed to use cognitive reappraisal strategies. Cognitive reappraisal is an effective and well-investigated strategy to improve emotion regulation and is a standard cognitive-behavioral psychotherapeutic intervention. During cognitive reappraisal the meaning of a picture is reinterpreted in order to reduce the emotional reaction. Recent fMRI studies have shown that cognitive reappraisal is associated with an increase in prefrontal activity and a decrease of amygdala activation.