________ was a Massachusetts reformer who sought to improve the treatment of people with psychological disorders in the mid-1800s.

In Inhelder and Piaget's balance experiment, a child who systematically tests the idea that the relationship between weight and distance is reciprocal is probably age

4. 7. 10. 14.

The stage in Piaget's theory during which children's thought is characterized by the use of mental representations and intuitive thought is called

A) preoperations. B) concrete operations. C) sensorimotor. D) formal operations.