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Updated: Jun 21, 2026

Electrophysiological Measurements and Analysis of Nociception in Human Infants
Published on: December 20, 2011
Can cortical responses following noxious stimulation inform us about pain processing in neonates?
Rebeccah Slater1, Maria Fitzgerald, Judith Meek
1Department of Anatomy and Developmental Biology, University College London, London, United Kingdom. r.slater@ucl.ac.uk
Insights
Assessing infant pain is difficult. Near-infrared spectroscopy measures cortical responses to pain, offering a way to validate current clinical pain assessment tools for neonates.
Area of Science:
- Neuroscience
- Neonatal care
- Pain research
Background:
- Pain measurement in neonates is challenging due to their inability to verbally express pain.
- Current pain assessment relies on behavioral and physiological indicators, which may not accurately reflect cortical pain processing.
- Higher cortical processing is essential for the perception of pain.
Purpose of the Study:
- To review the application of near-infrared spectroscopy (NIRS) in assessing neonatal pain.
- To compare NIRS-based cortical responses with existing clinical pain assessment measures.
- To determine if current measures truly reflect cortical pain processing in infants.
Main Methods:
- Review of recent studies utilizing near-infrared spectroscopy (NIRS) in neonates.
- Comparison of NIRS-measured cortical responses to nociception with established clinical pain assessment tools.
- Analysis of the correlation between outcome measures and perceived pain requiring higher cortical processing.
Main Results:
- Near-infrared spectroscopy (NIRS) enables direct measurement of cortical responses to nociception in neonates.
- NIRS provides an objective measure to evaluate the validity of current behavioral and physiological pain indicators.
- The magnitude of cortical responses measured by NIRS can be compared against clinical pain scores.
Conclusions:
- Near-infrared spectroscopy (NIRS) offers a promising method for objective pain assessment in neonates.
- Further research is needed to validate NIRS as a reliable measure of perceived pain in infants.
- Comparing NIRS data with clinical measures can enhance the accuracy of pain management in vulnerable neonates.
Abstract:
The measurement of pain in neonates presents a unique challenge. Infants, unable to describe pain verbally, rely on caregivers to assess and manage pain on their behalf. Behavioral and physiological indicators, often used in pain assessment in this population, are assumed surrogate measures of pain processing; however, it has not been proven that these outcome measures correlate with perceived pain, which requires higher cortical processing. Recent studies in neonates have used near-infrared spectroscopy to measure the cortical responses to nociception. The magnitude of these responses can be compared with current clinical pain assessment measures, which provides the opportunity to assess whether these measures are a true reflection of cortical pain processing. This review discusses the use of near-infrared spectroscopy and compares it with alternative pain assessment measures in this vulnerable population.
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