01:830:338 Lecture Notes - Lecture 5: Reinforcement Sensitivity Theory, Behavioural Genetics, Twin Study

• School: Rutgers University
• Department: Psychology
• Course: 01:830:338
• Professor: Professor Lyra Stein

Document Summary

History hippocrates and galen: proposed four personality types tied to excesses of bodily humors. Sanguine (optimistic: brought idea that physical properties determine personality. Behavioral genetics study of genetic influences on behavioral qualities (including personality) Twin studies: monozygotic twins identical (100% shared genes, dizygotic twins fraternal (average 50% shared genes, compute correlation between sets of monozygotic twins and co-twins and dizygotic twins and co-twins on some characteristic. Shared environment features of environment in common. Nonshared environment environmental factors that make people different. Heritability proportion of observed variance in a group of individuals that can be accounted for by genetic variance. Eysenck proposed that introverts normally have higher cortical arousal than extraverts. Avoid social interaction because it causes overstimulation: evidence. Reinforcement sensitivity theory behavioral approach system (bas) and behavioral inhibition system (bis) reside in brain. Bas regulates approach behaviors: high bas - motivated to seek out and achieve pleasurable goals.