Attention problems relate to behavioral problems such as inattention, impulsivity and hyperactivity. Early symptoms include impulsivity, irritability, and hyperactivity. Cluster B personality disorders are all characterized by emotional dysregulation, impulsivity, and frequent interpersonal conflicts. Behavioural problems most commonly seen include overactivity, impulsivity and sleeping difficulties. Behavioral, psychosocial, and psychopharmacological treatments for disorders involving impulsivity are common. The three traits are associated with impulsivity, manipulative behaviours and lack of empathy. Empirical tests find that Extraversion is a better predictor than Impulsivity of reward learning. It improved disturbed behavior by reducing aggression, impulsivity, emotional outbursts, and oppositionality. Classification may also encompass aggression-related emotions (e.g. anger) and mental states (e.g. impulsivity, hostility). MDMA use is also associated with increased impulsivity and depression. As previously mentioned these motivations correlate to impulsivity and anxiety respectively. The term "impulsivity" is commonly used to describe this behavioural pattern. Psychoticism may be divided into narrower traits such as impulsivity and sensation-seeking. They relate to the direction of anger, its locus, reaction, modality, impulsivity, and objective. This has been theoretically linked to increased impulsivity.