There are two types of reciprocity: turn-taking reciprocity and extended reciprocity. Turn-taking is when partners immediately self-disclose with one another and extended is when disclosure happens over a period of time, in which one partner may be the only one disclosing while the other just listens. Those who engage in turn taking reciprocity are shown to like their interaction partners more than those who engage in extended reciprocity. Turn taking partners are also shown to feel closer and similar to each other and to enjoy the other's company more than extended pairs. This can be explained by the social attraction-trust hypothesis because the partners perceive the discloser as liking and trusting them because they disclosed personal information. Those who engage in extended reciprocity are affected by the social exchange theory and the norm of reciprocity which can account for the lower degree of liking. Since extended reciprocity limits reciprocating disclosure it creates an imbalance in disclosure which violates both of these theories. That said, people usually report that they themselves are disclosing more than is the other partner. This is called perceived partner reciprocity, and it is critical to the self-disclosure process in developing relationships.