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Department of Physiology, Faculty of Medicine, Kyoto University, Japan.

1. Recurrent EPSPs were produced in fast pyramidal tract (PT) cells in the cat motor cortex by stimulation of the medullary pyramid and/or by the glutamate-induced activity of neighbouring PT cells using the spike-triggered averaging (spike-TA) method. 2. In fast PT cells located lateral to the end of the cruciate sulcus, predominantly the motor cortical representation area of the distal forelimb, two components (fast and slow) of recurrent EPSPs were produced by pyramid stimulation. 3. In response to pyramid stimulation, the appearance of the fast and slow components of recurrent EPSPs correlated with the appearance of N1 and N2 field potentials, respectively. 4. The monosynaptic nature of both the fast and slow components of recurrent EPSPs was demonstrated by a double shock test (interstimulus interval less than 5 ms) and high frequency repetitive stimulation (50-100 Hz). 5. The generation of the fast and slow components of recurrent EPSPs was attributed to the synaptic action of recurrent collaterals of fast and slow PT cells, respectively. 6. The amplitude of the slow component of recurrent EPSPs markedly increased with an increase in the stimulus frequency whereas that of the fast component did not, despite the change in stimulus frequency. 7. Selected spike-triggered averaging also revealed frequency facilitation of recurrent individual EPSPs produced in fast PT cells by the activity of single slow PT cells. 8. In fast PT cells located in the anterior and posterior lips of the cruciate sulcus, the motor cortical representation area of the proximal limb or trunk, only the slow component of recurrent EPSPs was produced by pyramid stimulation. 9. It is concluded that the pattern of recurrent connections between neighbouring PT cells differs depending on the motor cortical representation area, and that frequency facilitation of recurrent EPSPs is caused mainly by the input from axon collaterals of slow PT cells.

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