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Fig. 4. (A–C) Typical paired records from Type I neurons in three different preparations to water and odorant flow past the antennular flagellum in the (PD) proximal-to-distal and the (DP) distal-to-proximal directions. The cells were most sensitive to hydrodynamic movements in the PD direction, whereas the responses to odorants in the two respective flow directions were not very different from one another (see data in Fig. 5). The hydrodynamic aspects of odorant onset were damped by adaptation to the previous (water onset) stimulus and by the nearly seamless operation of the switching valve. At the start of a standard stimulus sequence, water was suddenly switched on from a no-flow condition; after 3 s odor was seamlessly exchanged for water within the olfactometer during a 4-s period, after which water replaced the odor flow for an additional 3 s. Rates of water flow through the olfactometer with the antennular flagellum in place for the neurons in A and B were, respectively, 15 ml min^–1 (PD) and 14.4 ml min^–1 (DP), 14.7 ml min^–1 (PD) and 14.4 ml min^–1 (DP). Odor flow rates for A and B, respectively, were 15.6 ml min^–1 (PD) and 14.4 ml min^–1 (DP), 18 ml min^–1 (PD) and 16.8 ml min^–1 (DP). Flow rates of water through the olfactometer in C were 14.4 ml min^–1 (PD) and 13.8 ml min^–1 (DP). Odor flow rates were 17.4 ml min^–1 (PD) and 15 ml min^–1 (DP), respectively.

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