Cosmosophy: Twin studies: a very painful pebble in the shoe of genomics deniers

dimanche 11 novembre 2018

Twin studies: a very painful pebble in the shoe of genomics deniers

"In studies that omit anecdotal evidence of the striking similarities of twins (that laymen and researchers alike find so fascinating), heritability is found to be between 0.2–0.8 for a variety of traits and characteristics. Roughly speaking, this means that between 20 percent and 80 percent of the differences in a trait or characteristic (e.g., extraversion) can be explained by differences in genes.* When it comes to personality traits, depression, and phobias, twin studies have shown that there is more room for the environmental influence. At the low end, heritability for phobias and depression range between 0.2 and 0.4. Personality traits—specifically, ‘The Big Five’ of extraversion, openness, agreeableness, conscientiousness, and neuroticism—range from 0.4–0.6. And, at the top end, the heritability of intelligence scores about 0.75."

"Twin studies have uncovered the enormous importance of genetics. They have laid to rest the notion that parents are omnipotent sculptors, and a child is a piece of clay. They have hammered another nail into the coffin of the Freudian guilt complex, where everything that goes wrong in an individual’s life may be attributable to poor parenting."

It is amazing and sad that such a scientific material (I mean past twin studies and other studies about twins in the world) is always today ignored by people, hidden by biased scientists and that parents and society are misled by Marxian and Lysenkoist conceptions on human nature.