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The arm area of the baboon's precentral motor cortex was stimulated by brief surface-anodal pulses, and the post-synaptic potentials elicited in contralateral forelimb motoneurones were studied by intracellular recording.2. Strong cortical stimuli elicited a rapid series of excitatory and, in some cells, inhibitory post-synaptic potentials (EPSPs and IPSPs respectively). Comparisons with the simultaneously recorded response of the pyramidal tract indicated that these post-synaptic potentials were due to a repetitive discharge of fast pyramidal fibres. Thus, the later synaptic events were mostly due to a repetition of the early monosynaptic EPSP and early IPSP respectively.3. Inhibition was seen more often in cells whose monosynaptic EPSP had a small maximal size than in those whose monosynaptic EPSP was larger. The net depolarization produced by a strong cortical stimulus was related to the maximal size of the early monosynaptic EPSP.4. In the Discussion, an interpretation is suggested for previous findings concerning the spinal distribution of late synaptic effects elicited by cortical stimulation.

用短暂的表面阳极脉冲刺激狒狒中央前回运动皮层的臂区，通过细胞内记录研究对侧前肢运动神经元诱发的突触后电位。
强皮层刺激引发了一系列快速的兴奋性突触后电位，在某些细胞中还引发了抑制性突触后电位（分别为兴奋性突触后电位和抑制性突触后电位）。与同时记录的锥体束反应进行比较表明，这些突触后电位是由于快速锥体纤维的重复放电所致。因此，后期的突触事件大多分别是早期单突触兴奋性突触后电位和早期抑制性突触后电位重复的结果。
在单突触兴奋性突触后电位最大幅度较小的细胞中比在单突触兴奋性突触后电位较大的细胞中更常观察到抑制现象。强皮层刺激产生的净去极化与早期单突触兴奋性突触后电位的最大幅度有关。
在讨论中，对先前关于皮层刺激诱发的晚期突触效应在脊髓分布的研究结果提出了一种解释。

The arm area of the baboon's precentral motor cortex was stimulated by brief surface-anodal pulses, and the post-synaptic potentials elicited in contralateral forelimb motoneurones were studied by intracellular recording.2. Strong cortical stimuli elicited a rapid series of excitatory and, in some cells, inhibitory post-synaptic potentials (EPSPs and IPSPs respectively). Comparisons with the simultaneously recorded response of the pyramidal tract indicated that these post-synaptic potentials were due to a repetitive discharge of fast pyramidal fibres. Thus, the later synaptic events were mostly due to a repetition of the early monosynaptic EPSP and early IPSP respectively.3. Inhibition was seen more often in cells whose monosynaptic EPSP had a small maximal size than in those whose monosynaptic EPSP was larger. The net depolarization produced by a strong cortical stimulus was related to the maximal size of the early monosynaptic EPSP.4. In the Discussion, an interpretation is suggested for previous findings concerning the spinal distribution of late synaptic effects elicited by cortical stimulation.

用短暂的表面阳极脉冲刺激狒狒中央前回运动皮层的臂区，通过细胞内记录研究对侧前肢运动神经元诱发的突触后电位。
强皮层刺激引发了一系列快速的兴奋性突触后电位，在某些细胞中还引发了抑制性突触后电位（分别为兴奋性突触后电位和抑制性突触后电位）。与同时记录的锥体束反应进行比较表明，这些突触后电位是由于快速锥体纤维的重复放电所致。因此，后期的突触事件大多分别是早期单突触兴奋性突触后电位和早期抑制性突触后电位重复的结果。
在单突触兴奋性突触后电位最大幅度较小的细胞中比在单突触兴奋性突触后电位较大的细胞中更常观察到抑制现象。强皮层刺激产生的净去极化与早期单突触兴奋性突触后电位的最大幅度有关。
在讨论中，对先前关于皮层刺激诱发的晚期突触效应在脊髓分布的研究结果提出了一种解释。

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