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用伤害性刺激猫的腓浅神经（ＰＮ）诱发体感皮层Ⅰ区（ＳⅠ）单位放电（ＥＤ），以放电阵列图和标准化互协方差函数进行定量分析。结果显示，用２５Ｖ刺激时引起Ａ类和Ｃ类纤维传入，在ＳⅠ记录到潜伏期为１４．８±５．０ｍｓ的早期ＥＤ（Ｅ），与用３Ｖ弱刺激ＰＮ时只引起单纯Ａ类纤维传入引起的放电反应比较，潜伏期无显著区别。用极化电流阻断Ａ类纤维传入后，单纯Ｃ类传入只引起潜伏期为２２２．６±２８．７ｍｓ的晚期ＥＤ（Ｌ）或１２９．２４±２３ｍｓ的中期ＥＤ（Ｍ），Ｍ、Ｌ可相互抑制，也可被Ａ类纤维传入所抑制。静脉注射镇痛剂吗啡后，Ｍ和Ｌ显著减少，Ｅ变化不显著。提示Ｃ类纤维传入可能分两类分别到达ＳⅠ区引起两种不同潜伏期的诱发放电，均与疼痛关系密切，都可作为慢痛反应的指标。
The discharge (ED) of the somatosensory cortex Ⅰ region (S Ⅰ) was induced by nociceptive stimulation of the cat’s peroneal nerve (PN). The discharge array and normalized covariance function were used for quantitative analysis. The results showed that when stimulated with 25V, A and C fibers were induced, early ED (E) with a latent period of 14.8 ± 5.0ms was recorded in SⅠ, and only weak class A fibers Inhalation caused by the discharge reaction, the incubation period no significant difference. After the afferent A-fibers were blocked by polarized current, the simple C-type afferent only caused the late ED (L) with a latent period of 222.6 ± 28.7 ms or the medium-term ED (M) with 129.24 ± 23 ms, L can inhibit each other, but also by the introduction of Class A fiber inhibition. After intravenous analgesic morphine, M and L were significantly reduced, E change was not significant. It is suggested that the introduction of C fiber may reach the SⅠ region in two categories and cause two kinds of evoked discharges with different incubation periods, all of which are closely related to the pain.