According to Daniel Bar-Tal, delegitimization is the "categorization of groups into extreme negative social categories which are excluded from human groups that are considered as acting within the limits of acceptable norms and values". Moral exclusion occurs when outgroups are subject to a different set of moral values, rules, and fairness than are used in social relations with ingroup members. When individuals dehumanize others, they no longer experience distress when they treat them poorly. Moral exclusion is used to explain extreme behaviors like genocide, harsh immigration policies, and eugenics, but it can also happen on a more regular, everyday discriminatory level. In laboratory studies, people who are portrayed as lacking human qualities are treated in a particularly harsh and violent manner. Dehumanized perception occurs when a subject experiences low frequencies of activation within their social cognition neural network. This includes areas of neural networking such as the superior temporal sulcus (STS) and the medial prefrontal cortex (mPFC). A 2001 study by psychologists Chris and Uta Frith suggests that the criticality of social interaction within a neural network has tendencies for subjects to dehumanize those seen as disgust-inducing, leading to social disengagement. Tasks involving social cognition typically activate the neural network responsible for subjective projections of disgust-inducing perceptions and patterns of dehumanization. "Besides manipulations of target persons, manipulations of social goals validate this prediction: Inferring preference, a mental-state inference, significantly increases mPFC and STS activity to these otherwise dehumanized targets." A 2007 study by Harris, McClure, van den Bos, Cohen and Fiske suggests a subject's mental reliability towards dehumanizing social cognition due to decreased neural activity towards the projected target, replicating across stimuli and contexts. While social distance from the outgroup target is a necessary condition for dehumanization, some research suggests that this alone is insufficient. Psychological research has identified high status, power, and social connection as additional factors. Members of high-status groups more often associate humanity with the ingroup than the outgroup, while members of low-status groups exhibit no differences in associations with humanity. Thus, having a high status makes one more likely to dehumanize others. Low-status groups are more associated with human nature traits (e.g., warmth, emotionalism) than uniquely human characteristics, implying that they are closer to animals than humans because these traits are typical of humans but can be seen in other species. In addition, another line of work found that individuals in a position of power were