Toma S, Nakajima Y
Department of Physiology, School of Medicine, Chiba University, Japan.
Neurosci Lett. 1995 Jul 28;195(1):61-3. doi: 10.1016/0304-3940(95)11776-s.
We investigated the responsiveness of mechanoreceptors in the glabrous skin of the hand to triangular vibratory stimuli when the frequency and applied pressure to the skin were varied. Using a microneurographic technique, 13 single afferent activities were recorded from 4 kinds of mechanoreceptors. Both fast-adapting (FA) and slow-adapting (SA) units were sensitive to the vibratory stimuli. The relationship between the most sensitive frequency and applied pressure to the skin were analyzed as a tuning curve. FA-type I (FAI) was sensitive to vibratory stimuli at 30-40 Hz and the frequency which entrained one-to-one discharge at lower pressure was between 10 and 80 Hz. FA-type II (FAII) sensitivity was augmented sharply over 60-100 Hz. SA-type I (SAI) and SA-type II (SAII) responsiveness was almost the same and characteristic sensitivity to the vibratory stimuli was revealed under 15 Hz. Functional roles of these units, especially type I units, are discussed in relation to active touch such as texture discrimination with a finger.
我们研究了手部无毛皮肤中的机械感受器在皮肤所受频率和压力变化时对三角形振动刺激的反应。采用微神经图技术，从4种机械感受器记录了13个单根传入神经活动。快适应（FA）和慢适应（SA）单位对振动刺激均敏感。将最敏感频率与皮肤所受压力之间的关系分析为调谐曲线。FA-I型（FAI）对30 - 40Hz的振动刺激敏感，在较低压力下引发一对一放电的频率在10至80Hz之间。FA-II型（FAII）在60 - 100Hz以上时敏感性急剧增强。SA-I型（SAI）和SA-II型（SAII）的反应性几乎相同，并且在15Hz以下显示出对振动刺激的特征性敏感性。结合诸如用手指进行质地辨别等主动触觉，讨论了这些单位，尤其是I型单位的功能作用。
