Summary: A new study reports kicks and movements of unborn babies in the womb allow the child to map their bodies and assist in the eventual exploration of their surroundings.
The kicks a mother feels from her unborn child may allow the baby to ‘map’ their own body and enable them to eventually explore their surroundings, suggests new research led by UCL in collaboration with UCLH.
For the study, published today in Scientific Reports, researchers measured brainwaves produced when newborn babies kick their limbs during rapid eye movement (REM) sleep, finding that fast brainwaves – a brainwave pattern typically seen in neonates – fire in the corresponding hemisphere.
For example, the movement of a baby’s right hand causes brainwaves to fire immediately afterwards in the part of the left brain hemisphere that processes touch for the right hand. The size of these brainwaves is largest in premature babies, who at that age would usually still be in the womb.
The findings suggest that foetal kicks in the late stages of pregnancy – the third trimester – help to grow areas of the brain that deal with sensory input, and are how the baby develops a sense of their own body. The fast brainwaves evoked by the movement disappear by the time babies are a few weeks old.
“Spontaneous movement and consequent feedback from the environment during the early developmental period are known to be necessary for proper brain mapping in animals such as rats. Here we showed that this may be true in humans too,” explained study author Dr Lorenzo Fabrizi (UCL Neuroscience, Physiology & Pharmacology).
Kimberley Whitehead (UCL Neuroscience, Physiology & Pharmacology) said: “We think the findings have implications for providing the optimal hospital environment for infants born early, so that they receive appropriate sensory input. For example, it is already routine for infants to be ‘nested’ in their cots – this allows them to ‘feel’ a surface when their limbs kick, as if they were still inside the womb.
“As the movements we observed occur during sleep, our results support other studies which indicate that sleep should be protected in newborns, for example by minimising the disturbance associated with necessary medical procedures.”
The babies’ brainwaves were measured using electroencephalography (EEG), and were recorded continuously during sleep. Active sleep was identified behaviourally according to cot side observation of rapid eye movements, largely irregular breathing and frequent, isolated limb movements.
A total of 19 newborns aged two days on average took part in the study, and they were between 31 and 42 weeks corrected gestational age when studied. Corrected gestational age takes into account their age if they were still in the womb; a baby born at 35 weeks and being one week old would have a corrected gestational age of 36 weeks.
About this neuroscience research article
Funding: The research was carried out at UCL Neuroscience, Physiology & Pharmacology and the Elizabeth Garrett Anderson Obstetric Wing at UCLH, and was kindly supported by the Medical Research Council. Ethical approval was obtained from the NHS Research Ethics Committee.
Source: Kate Corry – UCL Publisher: Organized by NeuroscienceNews.com. Image Source: NeuroscienceNews.com image is in the public domain. Original Research: Open access research for “Developmental trajectory of movement-related cortical oscillations during active sleep in a cross-sectional cohort of pre-term and full-term human infants” by Kimberley Whitehead, Judith Meek & Lorenzo Fabrizi in Scientific Reports. Published November 30 2018. doi:10.1038/s41598-018-35850-1
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[cbtabs][cbtab title=”MLA”]UCL”Babies Kicking in the Womb Are Creating a Map of Their Bodies.” NeuroscienceNews. NeuroscienceNews, 30 November 2018. <https://neurosciencenews.com/baby-kicking-body-map-10278/>.[/cbtab][cbtab title=”APA”]UCL(2018, November 30). Babies Kicking in the Womb Are Creating a Map of Their Bodies. NeuroscienceNews. Retrieved November 30, 2018 from https://neurosciencenews.com/baby-kicking-body-map-10278/[/cbtab][cbtab title=”Chicago”]UCL”Babies Kicking in the Womb Are Creating a Map of Their Bodies.” https://neurosciencenews.com/baby-kicking-body-map-10278/ (accessed November 30, 2018).[/cbtab][/cbtabs]
Developmental trajectory of movement-related cortical oscillations during active sleep in a cross-sectional cohort of pre-term and full-term human infants
In neonatal animal models, isolated limb movements during active sleep provide input to immature somatomotor cortex necessary for its development and are somatotopically encoded by alpha-beta oscillations as late as the equivalent of human full-term. Limb movements elicit similar neural patterns in very pre-term human infants (average 30 corrected gestational weeks), suggesting an analogous role in humans, but it is unknown until when they subserve this function. In a cohort of 19 neonates (31–42 corrected gestational weeks) we showed that isolated hand movements during active sleep continue to induce these same somatotopically distributed oscillations well into the perinatal period, but that these oscillations decline towards full-term and fully disappear at 41 corrected gestational weeks (equivalent to the end of gestation). We also showed that these highly localised alpha-beta oscillations are associated with an increase in delta oscillations which extends to the frontal area and does not decline with age. These results suggest that isolated limb movements during active sleep could have an important role in experience-dependent somatomotor development up until normal birth in humans.