Flynn Effect Now Possibly Reversing

The Flynn Effect describes the steady rise in average human IQ test scores throughout the 20th century, first identified by New Zealand intelligence researcher James R. Flynn. Studies found that IQ scores increased by roughly 3 points per decade across many countries as new generations took standardized intelligence tests. However, more recent data from several developed nations suggests the trend has slowed, stalled, or even reversed since the late 20th century. Researchers now debate whether environmental changes, education shifts, or cultural factors are responsible for this possible "reverse Flynn effect."

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