Knowra Birth order Birth order Birth order is a person's position among siblings based on the sequence of their births. It is commonly studied as a possible influence on personality, development, and family relationships.
Birth-order effects : Observed or proposed associations between sibling position and differences in people's traits or outcomes. This is the central claim researchers examine when studying birth order.
Resource dilution model : A theory that each additional child can reduce the parental resources available to each child. It predicts that later-born children may receive less time, money, or educational support.
Frank Sulloway : An American historian and psychologist known for research arguing that birth order relates to personality and intellectual rebellion. His work made evolutionary explanations of birth-order differences influential.
Birth-order stereotypes : Popular generalizations that assign characteristic traits to firstborn, middle, youngest, or only children. These familiar profiles are stronger and more specific than most empirical findings justify.
Big Five personality traits : A model describing personality through openness, conscientiousness, extraversion, agreeableness, and neuroticism. Large studies have tested whether birth order predicts these broad personality dimensions.
Confluence model : A theory that children's intellectual development is shaped by the average intellectual environment in the family. Older siblings may gain from teaching younger ones, while each new child changes the household environment.
Birth order and intelligence : Research on whether sibling position is associated with measured cognitive ability. This is among the most studied proposed birth-order associations.
Only child : A person who has no siblings. Only children are often treated as a birth-order category, though they have no sibling position.
Educational attainment : The highest level of formal education a person completes. Studies examine whether older siblings attain more education than later-born siblings.
Parentification : A family dynamic in which a child takes on responsibilities or emotional roles usually expected of a parent. Older siblings sometimes acquire caregiving duties that can accompany their position in the family.
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