When a manipulation is strong, the levels of an independent variable are ______.
A. highly similar
B. distinct
C. ambiguous
D. able to produce null results
Ans: B
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Which of the statements below is NOT true according to Ernst Weber?
a. The constant for noticing differences in lifted weight is 1/53rd. b. He found that the jnd did not really differ for each of the senses. c. People can tell when a tone rises or falls in pitch by one-third of l%. d. Taste is the least sensitive of all the senses.
Electroconvulsive therapy ______
a. is most effective if administered several times a week for several weeks b. often results in memory impairments c. is more effective in treating schizophrenic disorders than mood disorders d. has no side effects
For normal-weight women, an overall weight gain of ________ is recommended during pregnancy
a. 10-15 pounds b. 15-25 pounds c. 25-35 pounds d. 35-45 pounds
Evidence suggests that antidepressants
a. May increase brain-derived neurotrophic factor. b. Increase inflammation in the brain. c. Operate entirely via dopamine 2 receptors. d. Have no effect on brain biochemistry.