The progressive increase in IQ in numerous countries over the past 40 to 50 years is referred to as the:

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The progressive increase in IQ in numerous countries over the past 40 to 50 years is referred to as the Flynn effect, named after James Flynn who discovered the trend in the 1980s. The other options (A) Hawthorne effect, (C) Forer effect, (D) Halo effect, and (E) McGurk effect are all different psychological phenomena that are unrelated to the increase in IQ over time.

The Progressive Increase in IQ in Numerous Countries Over the Past