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Quantitative Assessment of Cortical Auditory-tactile Processing in Children with Disabilities
Published on: January 29, 2014
Differences in characteristics of somatosensory evoked potentials between children and adults
Miho Takezawa1, Keita Kamijo2,3, Manabu Shibasaki4
1The Elementary School Attached to Nara Women's University, Nara.
Insights
Children
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Somatosensory System Research
Background:
- The somatosensory system is crucial for processing touch, temperature, and pain.
- Understanding developmental changes in somatosensory processing is key to identifying neurological maturation.
- Previous research has highlighted differences in sensory processing between children and adults, but specific waveform characteristics require further investigation.
Purpose of the Study:
- To compare somatosensory evoked potentials (SEPs) in prepubescent children and young adults.
- To identify developmental differences in the characteristics of SEPs, including waveform components, amplitude, and latency.
- To elucidate the nature of somatosensory system development, noting both hyper- and hypo-excitability.
Main Methods:
- Recorded somatosensory evoked potentials (SEPs) at frontal (Fz) and centroparietal (C3') electrodes.
- Administered electrical stimulation to the right median nerve at a frequency of 3 Hz.
- Compared SEP waveform characteristics, including component presence, amplitude, and peak latency, between children and adults.
Main Results:
- Significant differences in SEP waveforms at the C3' electrode between children and adults.
- Children exhibited additional positive (P3) and negative (N3) components at C3', not present in adults.
- Children showed larger P22 amplitude at C3' (hyper-excitability) and smaller N15 (Fz) and N27 (C3') amplitudes (immature system), with shorter peak latencies dependent on height.
Conclusions:
- The developing somatosensory system in prepubescent children displays unique waveform characteristics compared to adults.
- Evidence of both hyper- and hypo-excitability in neural activity during somatosensory processing in children suggests ongoing maturation.
- SEP analysis provides valuable insights into the developmental trajectory of the human somatosensory system.
Abstract:
The present study examined the characteristics of somatosensory processing in healthy prepubescent children (mean age: 124.9 ± 3.8 months) compared with young adults. Somatosensory evoked potentials at the frontal (Fz) and centroparietal (C3') electrodes were recorded by delivering an electrical stimulus to the right median nerve at a rate of 3 Hz. The characteristics of somatosensory evoked potential waveforms at C3' were markedly different between the two groups, while those at Fz were similar. Specifically, the waveforms at C3' in the children involved not only standard P12, N18, P22, N27, P45, and N60 components, but also additional positive (P3) and negative (N3) components between N27 and P45, which were not found in adults. The amplitude of P22 at C3' was significantly larger in the children than adults, indicating hyper-excitability/responsiveness of neural activity on somatosensory processing. In contrast, the amplitudes of N15 at Fz and N27 at C3' were smaller in the children than adults, suggesting an immature somatosensory system in the children. The peak latencies of P12, N15, and P18 at Fz, and P12 and N18 at C3' were significantly shorter in the children than adults, which was dependent on the height. These results indicate the developing somatosensory processing with hyper- and hypo-excitability of neural activity in prepubescent children.
