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用电脉冲刺激戊巴比妥麻醉或三碘季铵酚麻醉的31只猫的HVM,记录了旁中央中脑区的AEP。HVM刺激点46个,旁中央中脑区引导点1046个,得阳性反应点103个,锋电位式反应151个。用逐渐增强的电脉刺激HVM可得“等级”式和“全或无”式两类反应。对111个反应用不同频率的双刺激测试其反应性,其中有38个能跟随500Hz以上的PST;27个能跟随200～499Hz的PST;46个只能跟随199Hz以下的PST。给予短串刺激时,得到跟随500Hz以上和500Hz以下的两类反应。这些结果提示HVM与旁中央中脑区既有经突触的投射,又有直接的纤维连接。据计算,这些直接纤维的传导速度约为0.29～4.1m/秒,相当于细有髓鞘和无髓鞘两类纤维。描述了可能属于中枢轴突的某些传导特性。反映直接纤维连接的HVM刺激点与中脑中央灰质反应点的位置关系提示两者之间可能具有背腹方向的对应关系。讨论了双刺激与短串刺激方法结合应用对于评价所研究神经组织反应特性的某些优点。
HVMs of 31 cats that were anesthetized with pentobarbital or triiodide quaternary ammonium phenol were electropulsed, recording AEP in the paracentral midbrain region. There were 46 HVM stimulation points and 1046 guidance points in the central mesencephalic region, 103 positive reaction points and 151 frontal potential reactions. There are two types of “level” and “all or nothing” responses for HVM stimulation with increasing electrical stimulation. Reactivity was tested for 111 reactions with different frequencies of double stimulation, of which 38 were able to follow the PST above 500 Hz; 27 to follow the PST from 200 to 499 Hz; and 46 to only follow the PST below 199 Hz. Given a short string of stimuli, two types of reactions followed 500 Hz and below 500 Hz were obtained. These results suggest that both the HVM and the para-central mesencephalic area have both synaptic projections and direct fibrinolysis. It is calculated that the direct fiber conduction velocity of about 0.29 ~ 4.1m / s, the equivalent of fine myelinated and non-myelinated fibers. Some of the conduction properties that may belong to the central axons are described. The relationship between HVM stimulation point and central mesencephalic reaction point of direct fiber connection suggests that there may be a corresponding relationship between the two directions. Some advantages of the combination of dual stimulation and short string stimulation methods for assessing the response characteristics of the neurological tissue studied are discussed.