Scalp topography of SEP late components in patients with supra-tentorial lesions
| Autor: | Ken Nagata, Robert J. Buchan, Yasuhito Watahiki, Hiromichi Yuya, Yutaka Hirata, Yuichi Satoh, Yoshiaki Takanashi, Eriko Yokoyama |
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| Rok vydání: | 1996 |
| Předmět: |
Male
medicine.medical_specialty Neurology Somatosensory function Alzheimer Disease Evoked Potentials Somatosensory Reaction Time medicine Humans Radiology Nuclear Medicine and imaging In patient Degenerative dementia Aged Brain Mapping Radiological and Ultrasound Technology Cerebral infarction Brain Cerebral Infarction Anatomy Middle Aged medicine.disease medicine.anatomical_structure Somatosensory evoked potential Scalp Anesthesia Laterality Female Neurology (clinical) Psychology |
| Zdroj: | Brain Topography. 8:333-336 |
| ISSN: | 1573-6792 0896-0267 |
| DOI: | 10.1007/bf01184794 |
| Popis: | Somatosensory evoked potentials (SEP) to simultaneous bilateral median nerve stimulation were recorded in 7 patients with unilateral brain lesions, 8 patients with degenerative dementia, and 5 normal volunteers. Right-left amplitude difference was compared from serial topographic images and the amplitude was compared at homologous electrodes. In patients with unilateral lesions, the amplitude from the frontopolar, frontal, anterior-temporal, and/or occipital electrodes was smaller on the affected side at 240 and 360 msec, regardless of whether the subjects showed sensory deficit or not. No significant laterality was seen in the primary sensorimotor areas. Distribution obtained from the patients with degenerative dementia was quite symmetrical. A significant right-left amplitude difference was seen at the anterior temporal site at 180 and 240 msec in normal controls, although an almost symmetrical distribution was obtained on the topographic images. The late components of SEP are not associated with the primary somatosensory function, but possibly with other cortical pathways. |
| Databáze: | OpenAIRE |
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