original primary drive continue to exist. Thus, the primary drives of fear and pain exist behind the acquired drive of anxiety. Secondary drives can be based on multiple primary drives and even in other secondary drives. This is said to give them strength and persistence. Examples include the need for money, which was conceptualized as arising from multiple primary drives such as the drive for food and warmth, as well as from secondary drives such as imitativeness (the drive to do as others do) and anxiety. Secondary drives vary based on the social conditions under which they were learned – such as culture. Dollard and Miller used the example of food, stating that the primary drive of hunger manifested itself behind the learned secondary drive of an appetite for a specific type of food, which was dependent on the culture of the individual. Secondary drives are also explicitly social, representing a manner in which we convey our primary drives to others. Indeed, many primary drives are actively repressed by society (such as the sexual drive). Dollard and Miller believed that the acquisition of secondary drives was essential to childhood development. As children develop, they learn not to act on their primary drives, such as hunger but acquire secondary drives through reinforcement. Friedman and Schustack describe an example of such developmental changes, stating that if an infant engaging in an active orientation towards others brings about the fulfillment of primary drives, such as being fed or having their diaper changed, they will develop a secondary drive to pursue similar interactions with others – perhaps leading to an individual being more gregarious. Dollard and Miller's belief in the importance of acquired drives led them to reconceive Sigmund Freud's theory of psychosexual development. They found themselves to be in agreement with the timing Freud used but believed that these periods corresponded to the successful learning of certain secondary drives. Dollard and Miller gave many examples of how secondary drives impact our habitual responses – and by extension our personalities, including anger, social conformity, imitativeness or anxiety, to name a few. In the case of anxiety, Dollard and Miller note that people who generalize the situation in which they experience the anxiety drive will experience anxiety far more than they should. These people are often anxious all the time, and anxiety becomes part of their personality. This example shows how drive theory can have