Fig. 12. (A) Records showing differences in the rate of rise of the response to odorant (gray trace and gray stimulus routine) and to a combination of odorant and hydrodynamic stimuli (black trace and routine). Odorant pulses lasted 2 s. (B) Bar graph showing differences in the slopes as mV s^-1. Each bar is the mean ± 1 S.E.M. of at least eight measurements. A t-test analysis showed the two means to be significantly different at the 0.005 level of confidence.