Garkavenko V V
Neurosci Behav Physiol. 1977 Jan-Mar;8(1):1-5. doi: 10.1007/BF01153591.
Single unit responses of the first (SI) and second (SII) somatosensory areas to stimulation of the ventroposterior thalamic nucleus (VP) were investigated in cats immobilized with D-tubocurarine. In response to VP stimulation 12.0% of reacting SI neurons and 9.5% of SII neurons generated an antidromic spike. In most antidromic responses of both SI and SII neurons the latent period did not exceed 1.0 msec. The minimal latent period of spike potentials during orthodromic excitation was 1.5 msec in SI and 1.7 msec in SII. Neurons with an orthodromic spike latency of not more than 3.0 msec were more numerous in SI than those with a latency of 3.1--4.5 msec. The ratio between the numbers of neurons of these two groups in SII was the opposite. In SII there were many more neurons with a latency of 5.6--8.0 msec than in SI. EPSPs appeared after a latent period of 1.1--9.0 msec in SI and of 1.4--6.6 msec in SII. The latent period of IPSPs was 1.5--6.8 msec in SI and 2.2--9.4 msec in SII. The relative importance of different pathways for excitatory and inhibitory influences of VP on SI and SII neurons is discussed.
在使用筒箭毒碱麻痹的猫身上，研究了第一体感区（SI）和第二体感区（SII）对丘脑腹后核（VP）刺激的单单位反应。对VP刺激的反应中，12.0%的SI反应神经元和9.5%的SII神经元产生了逆向冲动。在SI和SII神经元的大多数逆向反应中，潜伏期不超过1.0毫秒。在顺向兴奋期间，SI中动作电位的最短潜伏期为1.5毫秒，SII中为1.7毫秒。SI中顺向动作电位潜伏期不超过3.0毫秒的神经元比潜伏期为3.1 - 4.5毫秒的神经元更多。SII中这两组神经元数量的比例则相反。SII中潜伏期为5.6 - 8.0毫秒的神经元比SI中多得多。SI中兴奋性突触后电位（EPSP）在1.1 - 9.0毫秒的潜伏期后出现，SII中在1.4 - 6.6毫秒后出现。抑制性突触后电位（IPSP）的潜伏期在SI中为1.5 - 6.8毫秒，在SII中为2.2 - 9.4毫秒。讨论了VP对SI和SII神经元的兴奋和抑制影响的不同通路的相对重要性。
