01:830:338 Lecture Notes - Lecture 6: Behavioural Genetics, Twin Study, Heritability

• School: Rutgers University
• Department: Psychology
• Course: 01:830:338
• Professor: K.Brynildsen

Document Summary

Lecture six biological underp innings of personali ty: proposed four personality types tied to excesses of bodily humors. Sanguine (optimistic: brought idea that physical properties determine personality. Heritability of personality: how much is personality genetically inherited, what if not influenced by genes is considered to be influenced by environmental factors, behavioral genetics study of genetic influences on behavioral qualities (including personality) Behavioral genetics: twin studies, monozygotic twins identical (100% shared genes) If trait is inherited by one, then shared by the other. Correlation of a trait should be higher in identical if trait is inherited: dizygotic twins fraternal (average 50% shared genes) Biology of personality: eysenck proposed that introverts normally have higher cortical arousal than extraverts. Avoid social interaction because it causes overstimulation: evidence. Extroverts click more quickly through tv seeking more stimulation, bored easily. Saliva on a q tip then have lemon juice and saliva on other side to see if salivate more.