A central feature of human psychology is our pervasive tendency to divide the social world into "us" and "them". We prefer to associate with those who are similar to us over those who are different, preferentially allocate resources to similar others, and hold more positive beliefs about similar others. Here we investigate the developmental…

Compared gestures of Chinese and American deaf children who had not been exposed to a usable conventional language model with speech of hearing children learning Mandarin or English. Found that deaf children conveyed central elements of motion events in their communications. Deaf American and Chinese children used gestures to express motion in…