structural:scholar_edition, information:filtering
Ego functions

Reality testing involves the individual's capacity to understand and accept both physical and social reality as it is consensually defined within a given culture or cultural subgroup. In large measure, the function hinges on the individual's capacity to distinguish between her own wishes or fears (internal reality) and events that occur in the real world (external reality). The ability to make distinctions that are consensually validated determines the ego's capacity to distinguish and mediate between personal expectations, on the one hand, and social expectations or laws of nature on the other. Individuals vary considerably in how they manage this function. When the function is seriously compromised, individuals may withdraw from contact with reality for extended periods of time. This degree of withdrawal is most frequently seen in psychotic conditions. Most times, however, the function is mildly or moderately compromised for a limited period of time, with far less drastic consequences' (Berzoff, 2011).