Table 3.

Distribution of sensitivities to pairs of four basic stimuli in rat taste cells (based on all possible combinations across 120 cells)

Combination (x, y)	No. cells tested	(p_x)(p_y)^3-a	Predicted	Observed	P^3-b
S, N	84	(0.643)(0.488) = 0.314	26.4	25	>0.65
S, H	71	(0.648)(0.507) = 0.329	23.3	23	>1.00
S, Q	71	(0.634)(0.493) = 0.313	22.2	21	>0.63
N, H	72	(0.542)(0.514) = 0.279	20.1	21	>0.81
N, Q	73	(0.479)(0.507) = 0.243	17.8	22	>0.06
H, Q	72	(0.514)(0.458) = 0.235	16.9	19	>0.36

↵F3-a Proportion of tested cells responding to each member of the pair; response criterion: ≥5 pA or 5 mV;
↵F3-b statistical difference tested using the Fisher exact probability test (SigmaStat version 2.0). S, Sucrose; N, NaCl; H, HCl; Q, QHCl.