If you wanted to conduct a study to determine whether rats find a particular drug pleasurable, the conditioned __________ paradigm would be a good test to use

The area of the brain that is crucial in expressing and regulating emotions is the

limbic system. prefrontal cortex. frontal lobe. corpus collosum.

After we turn out the lights at night and fall asleep, it generally takes us __________

minutes to fall into stage 4 sleep. a. about 30 b. about 60 c. less than 90 d. about 120 e. about 180