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The hypothesis largely survives one ordeal but not another
| The first 150 words of the full text of this article appear below. |
That antenatal experience could have dire
consequences is ancient folklore. In 1921 Stockard gave scientific form
to the idea in the "critical period" hypothesis: failure of a
developing organism to progress from one stage of development to the
next within preset time limits could lead to a permanent deficit. Since
then several studies have addressed related hypotheses, though mostly
in animals. From the 1950s human observational studies reported effects
in later life of various exposures
for example, to
radiation,1-3 famine,4 and
viruses.5 In a large number of more recent publications,
Barker has elaborated the idea that fetal experience might
"programme" cardiovascular health states in adult life. He has been
ingenious in seeking out birth records of cohorts of a half century ago
and more. Studies using such sources face some irreparable
difficulties
for instance, incomplete samples and attrition on follow
up with selective bias, inadequate as well as missing records, and
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