Psychological aspects of pain perception can influence the release of the neurotransmitters called ____________, the body's natural version of morphine

A psychologist or a psychiatrist is likely to diagnose one's difficulty in attaining adequate nightly sleep as a psychological disorder

A) even if it occurs relatively infrequently. Incorrect. Generally speaking, infrequent disruptions of the sleep cycle are not considered to be a sleep disorder, even if they are inconvenient or disruptive to a person's life. B) if it interferes with daily activities such as work and negatively impacts a person's health. Correct. Everybody has the occasional difficulty sleeping, but when those difficulties significantly interfere with a person's functioning, they may indicate a sleep disorder. C) only if the person feels that the lack of sleep is causing problems in other areas. D) when it results from a deliberate choice, such as studying all night for an exam.

Research has indicated that:

a. in order to experience a generalized anxiety disorder, a person must have lived through a specific anxiety-producing event. b. it is normal for an individual to feel anxious, be in a general state of apprehension, or experience psychological tension for a period of time. c. the majority of people who live through a traumatic experience continue to have posttraumatic stress disorder symptoms for many years. d. if loss of interest in familiar activities and a sense of detachment from others persist for two weeks after a trauma, then posttraumatic stress disorder is diagnosed.