Kanno A, Nakasato N, Murayama N, Yoshimoto T
Kohnan Hospital, Nagamachi-minami 4-20-1, Taihaku-ku, 982-8523, Sendai, Japan.
Neurosci Lett. 2000 Nov 3;293(3):187-90. doi: 10.1016/s0304-3940(00)01525-1.
The relative position of the P50m and the N100m sources of the auditory evoked magnetic field remains unclear. Magnetoencephalography was performed in 24 normal subjects. Contralateral P50m to left and right ear stimulus was observed in 21 and 19hemispheres, respectively. Ipsilateral P50m to left and right ear stimulus was observed in 17 and 16hemispheres, respectively. N100m was observed in all subjects for all stimuli. Relative position of the equivalent current dipole of the P50m was 1.0+/-7.6 (mean+/-SD) mm posterior, 2.0+/-5.8mm inferior and 1.8+/-8.0mm medial to the N100m dipole position considering all observations. We suggest that the P50m and N100m sources are colocated in an extended area of the cortex.
听觉诱发磁场中P50m和N100m源的相对位置仍不清楚。对24名正常受试者进行了脑磁图检查。分别在21个和19个半球中观察到对左耳和右耳刺激的对侧P50m。分别在17个和16个半球中观察到对左耳和右耳刺激的同侧P50m。在所有受试者中对所有刺激均观察到N100m。考虑所有观察结果，P50m等效电流偶极子的相对位置在N100m偶极子位置后方1.0±7.6（均值±标准差）mm、下方2.0±5.8mm和内侧1.8±8.0mm处。我们认为P50m和N100m源位于皮质的一个扩展区域内。
