linguistic:translation, stylistic:tone, stylistic:style_transfer, linguistic:paraphrasing
In developmental psychology

Psychologists Ken J. Rotenberg and Luanne Mann also explored the development of the reciprocity norm of self-disclosure and its functions in children’s attraction to peers. The findings indicated that the norm of reciprocity is involved in attraction to peers only by sixth grade; children in that cohort showed such an effect by reporting greater affection towards others who reciprocated the same amount of intimacy than those whose intimacy level deviated from the initiator’s. According to Youniss's theory of social development, children's friendship during the early part of middle childhood (5–8 years) is based upon reciprocity of behaviour that suggests a "tit-for-tat" rule of exchange and interaction. During the later part of middle childhood (9–11 years) and beyond, children's friendship is based on the reciprocity of behaviour that suggests a mutually cooperative principle of exchange as well as an appreciation of reciprocity.