Why is there an overall decrease in performance on IQ scores from the age of 20 to 74?
A) changes in psychological and physiological functioning
B) poor reliability
C) poor validity
D) changes in the test itself over the years

Question

Quizplus · Accepted Answer

The decrease in performance on IQ scores from the age of 20 to 74 can be attributed to changes in psychological and physiological functioning. As individuals age, there may be declines in cognitive abilities such as processing speed, working memory, and attention, as well as changes in brain structure and function. These changes can lead to a decline in overall performance on cognitive tests, including IQ tests.

Why Is There an Overall Decrease in Performance on IQ