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. 2003 Sep 5;552(Pt 3):961–974. doi: 10.1113/jphysiol.2003.048009

Figure 6. Differential effects of conditioning stimulation on activation of a commissural interneurone by group II and reticulospinal afferents.

Figure 6

A shows three traces, from top to bottom, extracellular records from an interneurone discharged by two test stimuli to Q at 5T, the PSTH derived from a series of 20 such stimuli and the cord dorsum volleys. B, PSTH and volleys traces as in A, showing that the same test stimuli are ineffective when preceded by conditioning stimulation (Q, 4 stimuli, 4T, 56 ms interval). C, traces as in A showing that the same interneurone was discharged on stimulation of reticulospinal fibres (RF, 4 stimuli 100 μA). D shows that the reticulospinal response was not substantially altered by the same conditioning stimuli as in B. Only the PSTH and the volleys are shown. On the right the PSTH records of responses to the test stimuli from A–D are shown on an expanded timebase to facilitate comparison.