Reite M, Teale P, Zimmerman J, Davis K, Whalen J
Department of Psychiatry, University of Colorado Health Sciences Center, Denver 80262.
Electroencephalogr Clin Neurophysiol. 1988 Dec;70(6):490-8. doi: 10.1016/0013-4694(88)90147-2.
We recorded auditory evoked magnetic fields in response to 128 15 msec duration 1 kHz tone pips from both hemispheres of 6 normal adult males. Auditory evoked potentials were recorded conventionally from a vertex lead. An approximately 50 msec latency component was identified in both the magnetic (called the M50) and EEG (called the P50) recordings. Isofield topographical contour maps were used to estimate M50 source location and depth. With respect to extracranial bony landmarks, M50 source locations were significantly higher and tended to be more posterior, over the left hemisphere. M50 and P50 latencies were not significantly different in 5 of 6 subjects; in one, M50 latencies were significantly longer than P50 latencies over the left hemisphere. Magnetic resonance images in 5 subjects were used to identify the neuroanatomical structure(s) present at the estimated source location. M50 sources appeared to reside in the cortex of the planum temporale in both left and right hemispheres in all 5 subjects.
我们记录了6名正常成年男性两半球对128个持续时间为15毫秒、频率为1千赫的纯音短声的听觉诱发磁场。听觉诱发电位按常规从头顶导联记录。在磁场记录（称为M50）和脑电图记录（称为P50）中均识别出一个潜伏期约为50毫秒的成分。等场地形图用于估计M50源的位置和深度。相对于颅外骨性标志，M50源位置在左半球明显更高且倾向于更靠后。6名受试者中有5名的M50和P50潜伏期无显著差异；在一名受试者中，左半球的M50潜伏期明显长于P50潜伏期。利用5名受试者的磁共振图像来识别估计源位置处存在的神经解剖结构。在所有5名受试者中，M50源似乎位于左右半球颞平面的皮质中。
