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New scientific study says that a developing human 35–37 weeks after conception, while still in the womb, can feel pain and it is different from regular touch

From:
Science Direct

Lorenzo Fabrizi1, 6, Corresponding Author Contact Information, E-mail The Corresponding Author, Rebeccah Slater1, 3, 6, Alan Worley4, Judith Meek5, Stewart Boyd4, Sofia Olhede2, Maria Fitzgerald1

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1 Department of Neuroscience, Physiology and Pharmacology, University College London, London WC1E 6BT, UK
2 Department of Statistical Science, University College London, London WC1E 6BT, UK
3 Nuffield Department of Anaesthetics, University of Oxford, Oxford OX3 9DU, UK
4 Department of Clinical Neurophysiology, Great Ormond Street Hospital for Children, London WC1N 3JH, UK
5 Elizabeth Garrett Anderson Obstetric Wing, University College Hospital, London NW1 2BU, UK

Received 6 May 2011; revised 8 July 2011; Accepted 4 August 2011. Published online: September 8, 2011. Available online 8 September 2011.

 

Summary

When and how infants begin to discriminate noxious from innocuous stimuli is a fundamental question in neuroscience [1]. However, little is known about the development of the necessary cortical somatosensory functional prerequisites in the intact human brain. Recent studies of developing brain networks have emphasized the importance of transient spontaneous and evoked neuronal bursting activity in the formation of functional circuits [ ]2[ and ]3[ ]. These neuronal bursts are present during development and precede the onset of sensory functions [ ]4[ and ]5[ ]. Their disappearance and the emergence of more adult-like activity are therefore thought to signal the maturation of functional brain circuitry [ ]2[ and ]4[ ]. Here we show the changing patterns of neuronal activity that underlie the onset of nociception and touch discrimination in the preterm infant. We have conducted noninvasive electroencephalogram (EEG) recording of the brain neuronal activity in response to time-locked touches and clinically essential noxious lances of the heel in infants aged 28–45 weeks gestation. We show a transition in brain response following tactile and noxious stimulation from nonspecific, evenly dispersed neuronal bursts to modality-specific, localized, evoked potentials. The results suggest that specific neural circuits necessary for discrimination between touch and nociception emerge from 35–37 weeks gestation in the human brain.

Highlights

► The human brain may discriminate touch from pain from 35–37 weeks gestation ► Before 35–37 weeks, touch and noxious lance evoke nonspecific neuronal bursts ► After 35–37 weeks, touch and noxious lance evoke modality-specific potentials


Corresponding Author Contact InformationCorresponding author

6These authors contributed equally to this work

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