Rats raised with toys/etc had more developed brains and neurons than those raised in empty cages a. ii. Stimulation not enough, also need interaction with other mice! Those raised with companions had more advantages than those raised in isolation: parents, freud parents = huge influence on behavior a. i. Personality and temperament = parents have no influence: peers, huge influence of peers/friends on personality a. i. Language development children of immigrants raised in america do not exhibit accent of parents a. iii. Preferences clothes/music/tv/etc: evolutionary explanation similarity to peers increases chances of survival and reproduction, cultural/societal influence, behaviors, ideas, attitudes, traditions shared by large group of people passed from one generation to the next, norms affect behavior b. i. Expressiveness: probably not biological generational differences within culture. Females develop speech faster: locus of control where one lays blame. Men = external (blame others: empathy. Biological explanation = hormonal differences that influence behavior. Nurture/environmental explanations: we model/imitate what we see, we reward gender stereotyped behavior.