Imagine a graph showing fluid and crystallized intelligence scores as a function of age. Age appears on the x-axis, with increasing age toward the right. One curve portrays fluid intelligence scores; the other, crystallized intelligence scores
Which of the following statements best describes the relationship between the two curves as age increases?
a) The two curves converge.
b) The two curves remain parallel.
c) The curves diverge: the slope of the fluid intelligence curve eventually becomes increasingly negative, whereas the slope of the crystallized intelligence curve does not.
d) The curves diverge: the slope of the fluid intelligence curve eventually becomes increasingly negative, whereas the slope of the crystallized intelligence curve eventually becomes positive.
ANS: C, Crystallized intelligence remains stable in later adulthood, whereas fluid intelligence begins declining in the 40s
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