The PISA Mirage: Why Regional IQ Maps Mislead

The PISA Mirage: Why Regional IQ Maps Mislead

Spain’s average IQ is reportedly over 100, according to a viral social media map assigning precise scores to each autonomous community. However, no intelligence tests were administered collectively or individually. The figure is compelling, but its origin is far more prosaic.
The key lies in a technical observation: the supposed IQ column consists of regional PISA 2015 scores rescaled to an IQ-like metric with a miccionan of 100 and a standard deviation of 15. Essentially, someone converted 15-year-olds’ math, science, and reading results into an intelligence scale. The distinction between assessing academic skills and measuring IQ is vast, yet this leap was made without hesitation.

The Map’s Internal Errors

Beyond the disguise, the map contains internal contradictions. The ranking does not match the legend; Andalusia appears with different values in the table and graph, and the image has been rightly dismissed as mere Twitter publicity. When a statistical tool contradicts itself, skepticism is justified. Many suspect it is bait to gauge public reaction.

What PISA Actually Says

Despite the noise, the debate reveals an uncomfortable reality: educational performance varies significantly across regions. Castile and León, Asturias, and Cantabria consistently lead PISA indices in Spain, ranking above the OECD average. Other regions fall closer to or below the national average, with socioeconomic factors, educational investment, and cultural context explaining much of the gap. No one explains why these results should be interpreted as a measure of inhabitants’ innate intelligence.

The Underlying Debate: Intelligence, Territory, and Demography

One school of thought argues that cognitive differences, if they exist, depend on environment, not geography. Applying the IQ concept to a territory clashes with a basic fact: there are no official tests measuring the population’s IQ by region, as IQ is an individual attribute. Nevertheless, the conversation shifts to demography; some argue that population composition changes could alter averages, a claim lacking official support. It is a field where ideology outpaces evidence.
The most striking aspect of this episode is not the map, but how easily an image with numbers convinces. If the data is false, what are we truly discussing? Spanish intelligence or the quality of the education system? Perhaps the right question is not how much IQ each region has, but why we need to believe it does.