Babies can distinguish painful stimuli as different from general touch from around 35-37 weeks gestation - just before an infant would normally be born - according to new research.
In a study published online in the journal Current Biology, scientists show that neural activity in the brain gradually changes from an immature state to a more adult-like state from 35 weeks of development. This change may indicate that neural circuitry allows babies to process pain as a separate sensation from touch.
Dr Rebeccah Slater, UCL Neuroscience, Physiology and Pharmacology, said: "Premature babies who are younger than 35 weeks have similar brain responses when they experience touch or pain. After this time there is a gradual change, rather than a sudden shift, when the brain starts to process the two types of stimuli in a distinct manner."
Scientists looked at the brain activity of 46 babies at the University College Hospital Elizabeth Garrett Anderson Wing. 21 babies in the study were born prematurely, giving scientists the opportunity to measure activity at different stages of human brain development, from babies at just 28 weeks of development through to those born 'full term' at 37 weeks.
Using electroencephalography (EEG), the scientists measured the babies' electrical brain activity when they were undergoing a routine heel lance - a standard procedure essential to collect blood samples for clinical use.
In the premature babies the EEG recorded a response to the heel lance of non-specific 'neuronal bursts' - general bursts of electrical activity in the brain. After 35-37 weeks the babies' response changed to localised activity in specific areas of the brain, indicating that they were now perceiving painful stimulation as separate to touch.
Dr Lorenzo Fabrizi, lead author of the paper from UCL Neuroscience, Physiology and Pharmacology, said: "We are asking a fundamental question about human development in this study - when do babies start to distinguish between sensations? In very young brains all stimulations are followed by 'bursts' of activity, but at a critical time in development babies start to respond with activity specific to the type of stimulation."
Dr Fabrizi added: "Of course, babies cannot tell us how they feel, so it is impossible to know what babies actually experience. We cannot say that before this change in brain activity they don't feel pain."
Previous studies have shown that there is a similar shift from neuronal bursts to evoked potentials in the visual system at this time, suggesting that 35-37 weeks is a time when important neural connections are formed between different parts of the brain.
Dr Slater said: "It is important to understand how the human brain develops so that we can provide the best clinical care for hospitalised infants."
The research was funded by the Medical Research Council and the Wellcome Trust.
Notes for Editors
1. For more information or to interview Dr Rebeccah Slater or Dr Lorenzo Fabrizi, please contact Clare Ryan in the UCL Media Relations Office on tel: +44 (0)20 3108 3846, mobile: +44 07747 565 056, out of hours +44 (0)7917 271 364, e-mail: firstname.lastname@example.org. 2. 'A shift in sensory processing which enables the developing human brain to discriminate touch from pain' is published online in the Current Biology today. Journalists can obtain copies of the paper by contacting UCL Media Relations.
About UCL (University College London)
Founded in 1826, UCL was the first English university established after Oxford and Cambridge, the first to admit students regardless of race, class, religion or gender, and the first to provide systematic teaching of law, architecture and medicine. UCL is among the world's top universities, as reflected by performance in a range of international rankings and tables. Alumni include Marie Stopes, Jonathan Dimbleby, Lord Woolf, Alexander Graham Bell, and members of the band Coldplay. UCL currently has over 13,000 undergraduate and 9,000 postgraduate students. Its annual income is over £700 million. www.ucl.ac.uk