Itomi K, Kakigi R, Hoshiyama M, Watanabe K
Department of Integrative Physiology, National Institute for Physiological Sciences, Okazaki, Japan.
Brain Topogr. 2001 Fall;14(1):15-23. doi: 10.1023/a:1012511621766.
We recorded somatosensory evoked magnetic field (SEF) to investigate the differentiation in the receptive area for the face, lower part of the posterior scalp (mastoid) and shoulder, which occupy an unique area in the homunculus. We analyzed the location of the equivalent current dipole (ECD) of SEF following electrical stimulation of the skin at the face, mastoid and shoulder in 20 normal subjects. Three deflections (1M, 2M and 3M) were obtained within 50 ms of the stimulation in 16 of 20 subjects. The peak latency of the 1M and 2M was not significantly different at any stimulus sites. The amplitude of the 1M was significantly larger following the face than mastoid stimulation (p<0.05). The 16 subjects were classified according to the locations of the ECD on stimulation of the mastoid: close to that for shoulder stimulation, but significantly (p<0.05) more superior and medial to that following the face stimulation (Type 1, eleven subjects); close to that for face stimulation, but significantly (P<0.05) more inferior and lateral to that following the shoulder stimulation (Type 2, five subjects). The site of the receptive area for the posterior scalp shows interindividual variation, possibly due to anatomical differences.
我们记录了体感诱发磁场（SEF），以研究面部、后头皮下部（乳突）和肩部在感觉区的差异，这些区域在人体模型中占据独特的位置。我们分析了20名正常受试者在面部、乳突和肩部皮肤电刺激后SEF等效电流偶极子（ECD）的位置。20名受试者中有16名在刺激后50毫秒内获得了三个偏转波（1M、2M和3M）。在任何刺激部位，1M和2M的峰值潜伏期均无显著差异。面部刺激后1M的波幅明显大于乳突刺激（p<0.05）。根据乳突刺激时ECD的位置，将这16名受试者分为两类：接近肩部刺激时的位置，但明显（p<0.05）比面部刺激时的位置更靠上和内侧（1型，11名受试者）；接近面部刺激时的位置，但明显（P<0.05）比肩部刺激时的位置更靠下和外侧（2型，5名受试者）。后头皮感觉区的位置存在个体差异，可能是由于解剖学差异所致。
