Trigeminal somatosensory evoked magnetic fields to tactile stimulation

To characterise the activation of the contra- and ipsilateral primary somatosensory cortex (SI) after tactile stimulation of the face. Trigeminal somatosensory evoked magnetic fields (TSEFs) were recorded after tactile stimulation of the lower lip, cheek, chin and forehead in 11 healthy subjects. Th...

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Bibliographic Details
Published in:Clinical neurophysiology 2006-09, Vol.117 (9), p.2007-2015
Main Authors: Nevalainen, P., Ramstad, R., Isotalo, E., Haapanen, M.-L., Lauronen, L.
Format: Article
Language:English
Subjects:
Adult
Biological and medical sciences
Brain Mapping
Electrodiagnosis. Electric activity recording
Electromagnetic Fields
Evoked Potentials, Somatosensory - physiology
Face - innervation
Female
Functional Laterality - physiology
Fundamental and applied biological sciences. Psychology
Humans
Investigative techniques, diagnostic techniques (general aspects)
Magnetoencephalography
Magnetoencephalography (MEG)
Male
Medical sciences
Middle Aged
Nervous system
Reaction Time - physiology
Somatosensory Cortex - physiology
Somatosensory evoked magnetic fields (SEF)
Somesthesis and somesthetic pathways (proprioception, exteroception, nociception)
interoception
electrolocation. Sensory receptors
Tactile stimulation
Touch - physiology
Trigeminal nerve
Trigeminal Nerve - physiology
Vertebrates: nervous system and sense organs
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Summary:To characterise the activation of the contra- and ipsilateral primary somatosensory cortex (SI) after tactile stimulation of the face. Trigeminal somatosensory evoked magnetic fields (TSEFs) were recorded after tactile stimulation of the lower lip, cheek, chin and forehead in 11 healthy subjects. The responses were determined visually from the waveforms and modelled with equivalent current dipoles (ECDs). Contralateral SI responses were evoked in all subjects after lip stimulation, and in 91% and 64% after right and left cheek, 73% and 82% after chin and 64% and 27% after forehead stimulation. The responses usually showed an early double-peak wave pattern, the underlying sources localising to the SI. In addition, altogether 37 ipsilateral SI responses were evoked in eight subjects. Fourteen of these responses were amenable to ECD modelling and localised to ipsilateral SI. Tactile stimulation of the lip area reliably activates the contralateral SI in normal subjects, but the success rate for other trigeminal areas is lower. Ipsilateral responses can be present after stimulation of any of the trigeminal branches in normal subjects. Recording of TSEFs after tactile stimulation of particularly the lip area provides a non-invasive technique to study the function of the trigeminal nerve.
ISSN:1388-2457
1872-8952
DOI:10.1016/j.clinph.2006.05.019