Genes have been found to account for only about 50% of a particular personality trait. What this statement means is that genes account at most for half of a given trait, not that half of all of personality is accounted for by genes. For some traits, genetic influence is far less and is often not measurable.... The second caveat to the genetic account of personality stability comes from research showing that people are not always true to their so-called personality traits (e.g., behavioral and mental states may be situationally determined). (LeDoux, Joseph. Synaptic Self, How Our Brains Become Who We Are. p 29-30. NY: Penguin Books, 2002.)

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