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. Author manuscript; available in PMC: 2007 Jun 8.
Published in final edited form as: J Neurophysiol. 2006 Mar 22;95(6):3911–3922. doi: 10.1152/jn.01262.2005

FIG. 9.

FIG. 9

Examples of depression of PSPs evoked from group Ib and group II afferents after MLF stimulation. A–D, E–H, I–L, M–P, and Q–T: records from 2 GS, 2 posterior biceps and semitendinosus (PBST), and one deep peroneal (DP) motoneuron, respectively. Same format as in Fig. 8. Intervals between the last relayed MLF volleys (arrows) and group I volleys in C, G, K, O, and S were −1.1, 0.9, −1.3, 0.3, and −0.8 ms, respectively. They would correspond to intervals of about 0.1, 2.1, −0.1, 1.5, and 0 ms with respect to afferent volleys in the fastest conducting group II afferents in the stimulated nerves that are delayed with respect to group I volleys. Note the depression of the second component (of group II origin) of the PSP in H and T, but not of the first component, which may be attributed to Ia afferents (Ia reciprocal inhibition from DP to GS motoneuron in E–H; monosynaptic Ia EPSP, as judged by its segmental latency of 0.8 ms in Q–T).