Which of the following explanations has been given for the age-based variation in the risk for depression?

Each of the following is true of classical and operant conditioning EXCEPT ______

a. they both involve the learning of associations b. responses in both are under the control of stimuli in the environment c. responses learned through them will generally last forever d. in both, new behaviors can build on previously established ones

Chuck, age 82, suffers from confusion, forgetfulness, and personality changes associated with old age. The general term that best describes Chuck's symptoms is:

a. hypertension b. atherosclerosis c. osteoporosis d. dementia