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Human Intelligence and Helpless Infants

Summary:
The Economist reports about research by Steven Piantadosi and Celeste Kidd from the University of Rochester who tried to explain why humans tend to be intelligent. Their answer: Because human babies are extraordinarily helpless when compared with other animals. … human infants take a year to learn even to walk, and need constant supervision for many years afterwards [indeed]. That helplessness is thought to be one consequence of intelligence—or, at least, of brain size. In order to keep their heads small enough to make live birth possible, human children must be born at an earlier stage of development than other animals. … … helpless babies require intelligent parents to look after them. But to get big-brained parents you must start with big-headed—and therefore helpless—babies. The result is a feedback loop, in which the pressure for clever parents requires ever-more incompetent infants, requiring ever-brighter parents to ensure they survive childhood.

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The Economist reports about research by Steven Piantadosi and Celeste Kidd from the University of Rochester who tried to explain why humans tend to be intelligent. Their answer: Because human babies are extraordinarily helpless when compared with other animals.

… human infants take a year to learn even to walk, and need constant supervision for many years afterwards [indeed]. That helplessness is thought to be one consequence of intelligence—or, at least, of brain size. In order to keep their heads small enough to make live birth possible, human children must be born at an earlier stage of development than other animals. …

… helpless babies require intelligent parents to look after them. But to get big-brained parents you must start with big-headed—and therefore helpless—babies. The result is a feedback loop, in which the pressure for clever parents requires ever-more incompetent infants, requiring ever-brighter parents to ensure they survive childhood.

Dirk Niepelt
Dirk Niepelt is Director of the Study Center Gerzensee and Professor at the University of Bern. A research fellow at the Centre for Economic Policy Research (CEPR, London), CESifo (Munich) research network member and member of the macroeconomic committee of the Verein für Socialpolitik, he served on the board of the Swiss Society of Economics and Statistics and was an invited professor at the University of Lausanne as well as a visiting professor at the Institute for International Economic Studies (IIES) at Stockholm University.

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