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Fig. 3. Hydrodynamic and odorant response characteristics of Type I OL
interneurons. (A) Intracellular records from a Type I cell in response to
water and odorant pulses (indicated by upward excursions in horizontal lines
below the record). The response to the onset of the water pulse was a phasic
burst of impulses followed by a shallow hyperpolarization. The response to a
brief (1 s) odor pulse consisted of a short hydrodynamic and a much longer
spike train, the latter being dose-dependent. The dotted line (marked 0 in
this and following figures) indicates the zero potential level. (B) The
difference in response latencies between hydrodynamic (open bars) and odorant
(filled bars) responses. Numerals next to each pair of bars show relative
concentrations of the standard (0.1% w/v) tetramin odorant. Each bar is the
mean ± 1 s.e.m. of five responses. (C) Response–intensity
function of the neuron represented in A and B. Each data point is the mean
± s.e.m. of five odor presentations at that relative concentration to
standard tetramin. The linear fit of the data points is described by the
equation y=8(logx)+39.6, R=0.99.
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