Which of the following chemicals has research found increases during sleep and may lead to changes in dreaming throughout the night?

There is a negative correlation between depression and ________

A) creativity B) intelligence C) SES D) REM latency

Thinking is defined in the textbook as the ____.?

a. ?use of knowledge to accomplish some sort of goal b. ?unconscious processing of mental symbols c. ?process involved in solving problems d. ?discovering the relationships between concepts and theories