Figure 4. Chemical specificity of taste cells does not vary with stimulus concentration.

Stimulation with four stimuli at progressively higher concentrations in four different taste cells. Cell 1 responded selectively to sucrose, cell 2 to cycloheximide and citric acid, cell 3 to NaCl and cell 4 to citric acid. These response patterns were stable across concentrations for all cells. Tested concentrations were: sucrose, 24, 288, 622, 900 mm; cycloheximide, 93, 267, 448, 490 μM; NaCl, 60, 70, 495, 975 mm; citric acid, 32 and 190 mm. Only two concentrations could be tested for citric acid.