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Fig. 3. Cumulative paired-pulse facilitation from an unidentified alpha
lobe-extrinsic neuron (A,B) or a PE1 neuron (C).
t was set to
the optimal time interval of the two pulses for the induction of paired-pulse
facilitation (30 ms in A, 20 ms in C). Filled circles, spike numbers elicited
by the first pulse; open circles, spike numbers to the second pulse. The
ordinate gives the number of spikes elicited by a single stimulus, and the
abscissa time in s. In B the stimulus artefacts mark the test pulses.