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Fig. 9. Bicuculline-sensitive inhibition induced by afferent nerve (Aff) nerve
stimulation. (A,B) Superimposed traces of the responses to paired pulse
stimulation of the Aff nerve. The paired stimuli were delivered at 20, 40, 60,
80, 100 and 120 ms intervals. Each record is an average response to eight
consecutive stimuli delivered at a rate of 0.1 Hz. Arrows denote the second
negative peak that increased as a function of the paired pulse interval. (A)
Before and (B) after the addition of bicuculline (100 µmol
l–1). (C) The amplitude of the responses to the second
stimulus, normalized by the amplitude of the first response, as a function of
the inter-stimuli interval. Diamonds indicate responses before, and squares,
responses after addition of bicuculline. N=9 (control),
N=7 (+bicuculline). (D,E) The inhibition induced by Aff stimulation
increases as a function of stimulus intensity. (D) The responses to a pair of
stimuli delivered to the Aff at an interval of 40 ms. Each trace shows the
response to different stimulus intensity, increasing from top to bottom. (E)
The amplitude (right axis) of the response to the first (circles) and second
(squares) stimulus as a function of stimulus intensity. Triangles indicate the
relative amplitude of the second response (left axis) as a function of
stimulus intensity.
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