What causes brain circuits to become much more efficient in middle childhood?
A) synaptogenesis
B) growth in the temporal lobe
C) increased numbers of neurons
D) myelination.
D) myelination. After myelin grows around an axon, it insulates the nerve impulse and speeds its action across the axon by as much as 100 times.
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If a study is high in internal validity, then the researcher can be fairly certain that changes in the ____ were indeed due to changes in the ____
a. construct validity of the cause; construct validity of the effect b. independent variable; dependent variable c. external variable; internal variable d. hypothesis; theory
A person who always chooses the cooperative option in the prisoner’s dilemma will always receive the highest reward.
a. True b. False
Tobacco use is the number one preventable cause of disease and death in the United States. What is number two?
a. anorexia nervosa b. bulimia nervosa c. homicide d. obesity
What information is presented on Axis I?
a. Major Clinical Syndromes b. Personality Disorders c. Psychosocial and Environmental Problems d. Neurological Functioning