Which evidence best demonstrates an environmental impact on intelligence?
A) a high correlation between the IQ scores of identical twins
B) a low correlation between the IQ scores of strangers
C) the rapid increase in average WISC scores seen during the past 25 years
D) the stability of WISC scores seen during the past 25 years

Question

Quizplus · Accepted Answer

The rapid increase in average WISC scores during the past 25 years suggests that environmental factors are impacting intelligence. This increase is known as the Flynn effect and is largely attributed to improvements in education, nutrition, and access to information. The other choices do not provide evidence for an environmental impact on intelligence.

Which Evidence Best Demonstrates an Environmental Impact on Intelligence