OSLO, July 14 — Norway’s experiment with compulsory upper-secondary education in the 1960s and 1970s gave the country a temporary cognitive boost, particularly among sons from lower-income families. But the mechanics here reveal a more sobering story: the policy slowed a long-term decline in intelligence test scores for that group, yet it did not stop it. The expansion made upper-secondary schooling mandatory for all students, a structural shift that increased educational attainment among poorer households.
The effect, according to a 2024 study that analyzed data through 2009, was a temporary rise in cognitive performance for boys from those backgrounds. The catch is that the benefit was most pronounced in the 1970s and 1980s, and the overall trend remained downward.
This is not a simple case of “schooling works, problem solved.” The research underscores that education shapes cognitive outcomes, but it also points to other forces at work. The study’s authors suggest that changes in family structure, nutrition, or media consumption may be contributing to the long-term decline. On closer reading, the policy bought time but did not reverse the tide.
Follow the money — and the demographics
The expansion was a classic social-democratic investment: the state mandated and funded broader access to education, betting that human capital would lift the bottom. For a period, it did. Lower-income sons who would have left school earlier instead stayed in classrooms, and their test scores reflected that extra training.
The boost was real enough to slow the overall cognitive decline for that demographic. But the decline continued.
That suggests that whatever is driving the broader downward trend — whether it is shifting family dynamics, poorer diet, or the rise of screens and passive entertainment — is powerful enough to partially offset even a major policy intervention. The study does not single out a culprit, but the implication is clear: education alone cannot inoculate a population against broader societal shifts.
What the data says — and what it doesn’t
The research, published in 2024, draws on data up to 2009, so it captures generations who passed through the reformed system and then aged into adulthood. The temporary spike in scores for lower-income sons is a genuine finding, but it is a lagging indicator — the policy was implemented decades before the peak effect appeared. That timing matters for policymakers looking for quick returns.
The study also leaves open questions. Why only sons?
The source material specifies that the boost was measured for sons, not daughters, which may reflect data limitations or genuine gender differences in how the policy affected cognitive outcomes. And why did the effect fade? The research does not provide a definitive answer, only a list of plausible suspects: family structure, nutrition, media consumption.
What to watch next
The Norwegian case offers a cautionary tale for other countries considering large-scale education mandates. The policy worked, but it worked within limits. The long-term decline in cognitive performance among lower-income groups suggests that education reform, however well-designed, must be paired with interventions targeting the other drivers of cognitive change.
Follow the money: the next round of research will likely try to isolate which of those other factors — diet, screen time, family stability — carries the most weight. For now, the lesson from Oslo is that compulsory schooling can lift a generation, but it cannot hold back the tide forever.
