Loudness of high-frequency sounds is determined by _________ whereas loudness of low-frequency sounds is determined by __________.
A. rate of action potentials; the number of neurons active at a time
B. the number of neurons active at a time; rate of action potentials
C. rate of action potentials; rate of action potentials
D. the number of neurons active at a time; the number of neurons active at a time
Answer: A
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