The phase following firing during which a neuron's action potential cannot be triggered is called the
a. relative refractory period. c. resting potential.
b. refractory period. d. all-or-none period.
B
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How common are delusions in schizophrenia?
A. They are experienced by approximately 50 percent of schizophrenics. B. Delusions are an essential feature of schizophrenia; their presence is required for a diagnosis of schizophrenia. C. Over 90 percent of those with schizophrenia experience delusions. D. While hallucinations are a common occurrence in schizophrenia, delusions are rare.
An adult male sparrow sings its normal song ____
a. if he hears the song during a sensitive period early in his life b. only when he hears a female bird singing c. if his own species' song is the first song he hears when young d. regardless of whether or not he has ever heard his species' song from another bird
Opioids are classified as ______
a. narcotics c. stimulants b. mild tranquilizers d. hallucinogens
Regarding the causes of mood disorders, which of the following statements is FALSE?
a. When a depression appears to be produced from within, perhaps by chemical imbalances in the brain, rather than as a reaction to life events, it is said to be exogenous. b. Heredity appears to be a major factor in the more severe (major) mood disorders, especially bipolar disorders. c. People who have a particular version of a gene are more likely to become depressed when they are stressed. d. If one identical twin is depressed, the other has a 67 percent chance of suffering from depression with a probability of 19 percent of both fraternal twins becoming depressed.