Fifty percent of the time, a person with normal hearing will be able to detect a clock's ticking 6 metres away when all is quiet. This illustrates the approximate _____ for hearing.
A) just noticeable difference
B) relative threshold
C) psychophysical boundary
D) absolute threshold
D) absolute threshold
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Which of the following birth control strategies has the lowest failure rate?
a. Rhythm method b. condom c. diaphragm d. birth control pill
Anorexia nervosa affects approximately _________ percent of young females in America
a. 1.5 b. 3 c. 5.5 d. 8
Multiple sclerosis results from a. strong heritability
b. exposure to environmental toxins. c. a combination of heritability and environmental factors. d. excessive exposure to the sun.
In children of average intelligence, the prefrontal cortex is relatively thick at age 7, and then
A. remains the same over the middle childhood period, as it was when the child was younger. B. peaks in thickness by age 12 for all children regardless of intelligence. C. gradually increases in thickness as brain connections are increased. D. peaks in thickness at about age 8 for typical children but peaks at 11 to 12 years for highly intelligent children.