If the human eye were not responsive to differences in the amplitude of light waves, we would not be able to perceive differences in

Compared to negative emotions, there are ____

a. fewer positive emotions, but they are more differentiated b. fewer positive emotions, and they are relatively undifferentiated c. more positive emotions, and they are more differentiated d. more positive emotions, but they are less differentiated

According to the National Institute of Mental Health, the leading cause of disability in the United States is

A. schizophrenia. B. panic disorder. C. obsessive-compulsive disorder. D. major depressive disorder.