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20 July 2009

Early Memories

Fetuses found to have memories

They weigh less than 3 pounds, usually, and are perhaps 15 inches long. But they can remember.

The unborn have memories, according to medical researchers who used sound and vibration stimulation, combined with sonography, to reveal that the human fetus displays short-term memory from at least 30 weeks gestation - or about two months before they are born.

"In addition, results indicated that 34-week-old fetuses are able to store information and retrieve it four weeks later," said the research, which was released Wednesday.

[...]

The baby's responses - primarily eye, mouth and body movements - were closely monitored over the weeks with ultrasound imaging to gauge "fetal learning" patterns. The researchers found that the babies acclimated themselves to the sounds and vibrations to the point that they no longer bothered to respond - a process known as "habituation." "The stimulus is then accepted as 'safe' " by the babies, the study said.

[...]

In 2003, psychologists and obstetricians at Queen's University in Canada found a profound mother-baby link. In a study of 60 pregnant women, they found that the unborn babies preferred the voices of their own mothers - both before and after birth.

The heart rates of fetuses sped up when they heard their mother reading a poem, and slowed down when they heard a stranger's voice - evidence of "sustained attention, memory and learning by the fetus," said Barbara Kisilevsky, a professor of nursing who led the research.

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