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Much of Galton's finding wasn't due to sibling psychology because, as he explained, primogeniture laws gave firstborns an immeasurable advantage. [4] However, Galton offered another causal explanation; that firstborns receive more parental attention, which is a direct precedent for some of the psychological causes of deidentification discussed ...
There is evidence of heritability in personality traits. For example, one study found that approximately half of personality differences in high-school aged fraternal and identical twins were due to genetic variation - and another study suggests that no one personality trait is more heritable than another. [6] [8]
Extraversion and introversion are a central trait dimension in human personality theory. The terms were introduced into psychology by Carl Jung, [1] though both the popular understanding and current psychological usage are not the same as Jung's original concept.
The child-rearing practices of the kibbutz system are sometimes cited as an example of the Westermarck effect. Seen here are a group of children in Kibbutz Gan Shmuel , circa 1935–40. The Westermarck effect , also known as reverse sexual imprinting , is a psychological hypothesis that states that people tend not to be attracted to peers with ...
Furthermore, at least one study, on the familial correlates of joining a same-sex union or marriage in a sample of two million people in Denmark, found that the only sibling correlate of joining a same-sex union among men was having older sisters, not older brothers.
The Practice and Theory of Individual Psychology is a work on psychology by Alfred Adler, first published in 1924. In his work, Adler develops his personality theory, suggesting that the situation into which a person is born, such as family size, sex of siblings, and birth order, plays an important part in personality development. [ 1 ]
For example, the child may exhibit some irrational problem requiring the constant care and attention of the parents. [ citation needed ] In Dibs in Search of Self , an account of a child therapy, Virginia Axline considered that perhaps the parents, "quite unconsciously...chose to see Dibs as a mental defective rather than as an intensified ...
Sibling care at orphanage in Zimbabwe. A relationship begins with the introduction of two siblings to one another. Older siblings are often made aware of their soon-to-be younger brother or sister at some point during their mother's pregnancy, which may help facilitate adjustment for the older child and result in a better immediate relationship with the newborn. [7]