人类初级体感皮层中具有不同恢复功能的两种诱发反应。
Two evoked responses with different recovery functions in the primary somatosensory cortex in humans.
作者信息
Hoshiyama M, Kakigi R
机构信息
Department of Integrative Physiology, National Institute for Physiological Sciences, Myodaiji, Okazaki 444-8585, Japan.
出版信息
Clin Neurophysiol. 2001 Jul;112(7):1334-42. doi: 10.1016/s1388-2457(01)00564-8.
OBJECTIVES
We investigated the recovery function of somatosensory evoked magnetic cortical fields (SEFs) to confirm the temporal aspects of the somatosensory process in humans.
METHODS
SEFs were recorded following median nerve electrical stimulation in 6 healthy subjects. Double stimulation, with interstimulus intervals (ISIs) from 3 to 100 ms, was applied, and the SEF components for the second stimulation were analyzed. In a supplementary experiment, responses to single stimulations of various intensities from the sensory threshold to the motor threshold were studied.
RESULTS
The first SEF component (1M) diminished when the ISI was less than 10 ms, while the second component (2M) remained even when the ISI was 3 ms. The two components showed a very similar attenuation with decrease of stimulus intensity. There was no significant difference in dipole location between 1M and 2M in the primary somatosensory cortex (SI).
CONCLUSIONS
The results suggested that at least two independent pathways with different recovery functions exist in a similar area in the SI.
目的
我们研究了体感诱发磁皮层场（SEFs）的恢复功能，以确认人类体感过程的时间特征。
方法
对6名健康受试者进行正中神经电刺激后记录SEFs。采用双刺激，刺激间隔（ISIs）为3至100毫秒，并分析第二次刺激的SEF成分。在一项补充实验中，研究了从感觉阈值到运动阈值的各种强度单次刺激的反应。
结果
当ISI小于10毫秒时，第一个SEF成分（1M）减弱，而当ISI为3毫秒时，第二个成分（2M）仍然存在。随着刺激强度的降低，这两个成分表现出非常相似的衰减。在初级体感皮层（SI）中，1M和2M之间的偶极位置没有显著差异。
结论
结果表明，在SI的相似区域中至少存在两条具有不同恢复功能的独立通路。
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