A groundbreaking study from University College London (UCL) has revealed that newborns are capable of sensing pain well before they can cognitively understand or emotionally react to it. The findings, published in the journal Pain, provide new insights into how infants’ brains develop the ability to process pain and have significant implications for neonatal care, especially for preterm babies. The research was led by Professor Lorenzo Fabrizi from UCL’s Department of Neuroscience, Physiology and Pharmacology. It explored how different components of pain perception emerge in early life, focusing on the various brain networks that contribute to the experience of pain.
The study involved analysis of brain scans from 372 infants, many of whom were born prematurely. The researchers utilized data from two of the largest infant brain imaging projects: the Developing Human Connectome Project and the Human Connectome Project. All infants were scanned within their first two weeks of life, ensuring that the results reflected natural brain development instead of the influence of postnatal experiences. The researchers focused on three specific brain networks associated with pain processing: the sensory-discriminative network, responsible for identifying and locating pain; the affective-motivational network, which governs the emotional response to pain; and the cognitive-evaluative network, crucial for interpreting and judging pain.
The findings showed that the sensory-discriminative network matures first, typically between 34 and 36 weeks after conception. This indicates that even premature infants can detect pain stimuli; however, they might struggle to identify the exact location of the pain. The next brain network to mature is the affective-motivational network, which reaches functional maturity around 36 to 38 weeks. In contrast, the cognitive-evaluative network, which is essential for understanding the significance of pain, doesn’t fully mature until after 42 weeks. This means that full-term newborns still lack the brain development needed for a complete understanding of pain, suggesting that their experience of discomfort is markedly different from that of adults.
These findings hold great relevance in medical settings, as a prior study from the same team had previously discovered that premature infants do not show signs of habituation to repeated medical procedures; they continue to react as though the pain is novel each time. The latest findings suggest that the immaturity of certain brain networks could explain this phenomenon, highlighting the need for tailored pain management strategies that consider a baby’s stage of neural development. Professor Fabrizi emphasized that preterm babies may be particularly vulnerable to painful medical procedures during critical stages of brain development; necessitating adjusted clinical practices to better protect this at-risk population.
In light of these findings, there is a pressing need to reshape clinical protocols for neonatal care, particularly for vulnerable infants. The research, funded by the UK’s Medical Research Council, involved collaboration with researchers from UCLH and King’s College London, paving the way for a more nuanced approach to managing pain in infants. This could ultimately lead to improved outcomes for preterm and newborn infants by ensuring that pain management is effectively aligned with their developmental stages. The study opens new avenues for further research into the complexities of pain perception in early life, potentially influencing future paediatric care practices.
-Raja Aditya
