The rise in each successive generation’s average IQ (Intelligence Quotient) test scores, named for the intelligence researcher James Flynn.
Example: Due to the Flynn effect, IQ test scoring must occasionally be reworked in order to “reset” the average score to 100. That is, if you took an IQ test from when your grandparents were children, you would likely score higher than on a modern IQ test.
Grinnell, R. (2016). Flynn Effect. Psych Central. Retrieved on March 20, 2018, from https://psychcentral.com/encyclopedia/flynn-effect/