Nicaraguan sign language developed because:

German researchers extended Chi’s studies with chess experts and found that when expert and novice chess players were asked to remember the random placement of chess pieces:

According to Helen Borke, 3-year-old Jennifer is MORE likely to solve a perspective-taking problem correctly:

Approximately what percentage of children in the United States have immigrant parents?

Freud believed that adolescence was a distinctive stage because:

When a child between the ages of 2 and 3 years old cannot produce a particular sound, she will typically:

The inhibition of impulsive actions is called effortful control.

According to G. Stanley Hall, young people:

Parents who demonstrate the authoritative pattern control their children by:

Selection refers to the process of: