Dr. Simon is observing several schizophrenic patients interact in a mental hospital ward without interfering. Which type of observation is Dr. Simon using?

Barley takes each of his toys out of the storage bin and lines them up along the wall of his bedroom. He then thinks to himself, "I have so many more toys now." In which of Piaget's stage of cognitive development does this evaluation represent a cognitive error that children typically correct?

a. preoperational b. formal operational c. concrete operational d. sensorimotor

The charge that exists across the nerve cell membrane is a result of differing

a. amounts of DNA and RNA. b. types of neurotransmitters on either side of the nerve cell membrane. c. types of neurons inside and outside the nerve cell membrane. d. concentrations of ions on either side of the nerve cell membrane.