. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 460 F. COROTTO ET AL 100 en D_ CO CL LU m 50- 0J. -7 -6 -5 -4 -3 GLUTAMATE CONCENTRATION [M] Figure 3. Glu-response functions of nine glutamate-sensitive cells. Five cells responded with one single spike to 1(T8 A/Glu (data not shown). There were no responses to Glu concentrations less than 1CT8 A/. Mean response function is broken line. test concentration (10 3 M). Three cells showed greatly reduced responses at the highest test concentration. The mean response function (not including the outlier cell) increased rather line
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 460 F. COROTTO ET AL 100 en D_ CO CL LU m 50- 0J. -7 -6 -5 -4 -3 GLUTAMATE CONCENTRATION [M] Figure 3. Glu-response functions of nine glutamate-sensitive cells. Five cells responded with one single spike to 1(T8 A/Glu (data not shown). There were no responses to Glu concentrations less than 1CT8 A/. Mean response function is broken line. test concentration (10 3 M). Three cells showed greatly reduced responses at the highest test concentration. The mean response function (not including the outlier cell) increased rather linearly from 10 7 to 10~4 M, and then saturated. In 19 cells, the mixture elicited an equal or stronger response than any single compound tested (Fig. 1). Sixteen of these cells had low firing rates, responding with less than 15 spikes to their best compound. Thus, they were rare among generally strongly responding Glu- and Tau- cells and common among generally weakly responding Arg, Hyp, NH4+ and Gly-cells (Fig. 1). Taking as a cri- terion a response difference of two spikes (representing about 15%, determined as response variability. Merrill, 1992), nine cells responded more strongly to the mixture than to their best single compound. In six of these cells, the response to the mixture was more than 15% stronger than the sum of the responses to all single compounds. In four of these cells, the response to the mixture was twice as strong as the sum of the responses to single com- pounds (Fig. 4). In 37 cells (Fig. 4), the response to the mixture was 15% smaller than the sum of the responses to the single compounds. In 32 of these cells, the sum was twice as strong as the response to the mixture. Discussion This study shr-\ that the tuning spectra of chemore- ceptor cell popula;.. is (denned by best compound) of the third maxillipeds of the lobster H. americamis are similar to the tuning spectra of prominent cell populations found in other lobster chemoreceptor appendages. The most
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