Which of the following is TRUE about expertise?
a. According to most researchers in the field, it takes about 25 years of study and practice in most fields to attain expertise.
b. The maturity of the frontal cortex reflects cognitive changes that underlie expertise.
c. Expertise tends to decline after young adulthood.
d. Expertise is defined in terms of knowledge base, rather than problem solving, because it is difficult to measure problem solving skills.
Answer: B
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