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Stage II sleep alters infants' short latency somatosensory evoked potentials
1Department of Psychiatry and Neurology, Tulane University Medical School, New Orleans, LA 70112.
Insights
Short latency somatosensory evoked potentials (SLSEP) in infants are significantly altered during stage II sleep. SLSEP amplitudes decrease and latencies increase, suggesting recordings should be done while infants are awake.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Sleep Medicine
Background:
- Short latency somatosensory evoked potentials (SLSEP) assess somatosensory pathway function.
- Infant sleep states can influence neurophysiological measures.
Purpose of the Study:
- To investigate the impact of stage II sleep on SLSEP in infants.
- To determine optimal recording conditions for infant SLSEP.
Main Methods:
- 16 healthy infants (2-12 months) underwent SLSEP testing.
- Recordings were performed during both waking and stage II sleep states.
- Electroencephalography (EEG) and behavioral observation classified sleep stages.
Main Results:
- SLSEP amplitudes were significantly lower during stage II sleep compared to waking.
- SLSEP potentials were absent in several infants during sleep.
- Peak latencies (N1, P1, P2) were significantly prolonged in stage II sleep.
Conclusions:
- Stage II sleep markedly attenuates and delays infant SLSEP.
- Waking state is recommended for reliable SLSEP assessment in infants.
- Altered SLSEP during sleep may impact the evaluation of infant neurological function.
Abstract:
To evaluate the effects of stage II sleep on short latency somatosensory evoked potentials (SLSEP) to median nerve stimulation, we studied 16 normal infants from two to twelve months of age. SLSEP were recorded during waking and stage II sleep. Four channels of parasagittal EEG and behavioral observations were used to classify states. Compared with SEP in the waking state, cerebral potentials in stage II sleep were of much lower amplitude, even vanishing entirely in several infants. In addition, the change from waking to stage II sleep produced significantly longer latencies of the peaks N1, P1, and P2. We suggest performing SLSEP in infants in the waking state in order to assess cerebral somatosensory function.