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Nature Neuroscience: Women’s Brains Shrink During Pregnancy

A just-released study published in the journal Nature Neuroscience shows that pregnant women lose gray matter in areas of the brain that de...

A just-released study published in the journal Nature Neuroscience shows that pregnant women lose gray matter in areas of the brain that deal with people’s feelings and nonverbal signals.

However, the loss, rather than diminish this area of brain processing, appears to make it more efficient, enabling improved interpretation of their babies’ needs and emotions, and therefore increasing their maternal attachment.

Due to the time frame of the study, which was conducted by researchers in the Netherlands and Spain, it is not known whether the effects are permanent or temporary.
New Revelations say Pregnant Women Brains Shrink 

During the study, a group of fathers and first-time mothers had MRI scans before pregnancy and after giving birth. While the brains of the fathers remained unchanged, the study’s authors said, the scans of the mothers showed a loss of gray matter.

"Loss of volume does not necessarily translate to loss of function," Elseline Hoekzema, co-lead author of the study and a senior brain scientist at Leiden University in the Netherlands, told CNN. "Sometimes less is more."

She said that the loss of gray matter could "represent a fine-tuning of synapses into more efficient neural networks."

Another neuroscientist, Robert Froemke of New York University’s Langone Medical Center, compared the process to “spring cleaning.”

“It’s making things more organized, streamlined, coherent to prepare mothers for the complexity and urgency of childcare,” he told the online magazine Healthline. 

“If neurons are closer together, or neural connections reorganized to disregard irrelevant synapses and preserve important synapses, or otherwise able to more effectively, reliably, and rapidly process critical information, it’s easier to imagine why this might make sense, and help the maternal brain respond to the needs of her baby.”

And as for the forgetfulness sometimes associated with new mothers, Froemke says the brain shrinkage probably has nothing to do with it.

“Parenting — particularly motherhood — is among the most complex and stressful set of events and behaviors we experience in our lives,” he told Healthline. “Taking care of another person, especially a helpless infant, is a lot of work and can demand much or all of our attention.” - USA Today 

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