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Figure 4


Fig. 4. The afferent nerve (Aff) has a lower threshold and a shorter dynamic range of stimulation than the parallel fibers (PF). (A,B) The responses to Aff and PF stimulation, respectively, following increase in stimulus intensity (from top to bottom). Each record is an average response to eight consecutive stimuli delivered at a rate of 0.1 Hz and recorded at a depth of 500 µm below the surface of the DON. (C,D) Superposition of the responses shown in A and B, respectively. Note the change in delay of the response to PF stimulation. (E,F) Amplitude of the responses to Aff stimulation and PF stimulation, respectively, as a function of the stimulus intensity. The amplitude of the response in each experiment was normalized by the maximal amplitude (N=4; each symbol represents one experiment). Note the different scale of the x-axes; hence, the threshold of the PF is higher than that of the Aff nerve.





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