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In page Sympathy:

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It is important to acknowledge that the use or acceptance of sympathy can be both altruistic and self-satisfying in social situations. Parenting styles (specifically level of affection) can influence the development of sympathy.[4] Prosocial and moral development extends into adolescence and early adulthood as humans learn to better assess and interpret the emotions of others. Prosocial behaviours have been observed in children 1–2 years old. Through self-report methods it is difficult to measure emotional responses as they are not as able to report these responses as well as adult.[3] This is representative of an increased efficiency of and ability to engage in internal moral reasoning.