When longitudinal studies were used to understand cognitive functioning, it was found that:
A) Global IQ tends to rise until the mid-50s and then gradually declines.
B) Global IQ tends to rise until the mid-30s and then declines sharply.
C) Global IQ remains constant throughout the entire lifespan.
D) Global IQ rises sharply until the mid-20s and then stabilizes.

Question

Quizplus · Accepted Answer

Longitudinal studies have shown that global IQ, or general intelligence, tends to increase until the mid-50s, after which it begins to gradually decline. This pattern reflects the accumulation of knowledge and skills over time, followed by a slow decrease in cognitive abilities as part of the aging process.

When Longitudinal Studies Were Used to Understand Cognitive Functioning, It