Table 1.

Summary of data used to determine differential sensitivities of the moist and dry cells in cockroaches and stick insects

Type of receptors	Moist cell of cock- roach	Dry cell of cockroach	Moist cell of stick insect	Dry cell of stick insect
Stimulus: humidity
Range in which humidity oscillated, % RH	0 to 50	0 to 50	0 to 50	0 to 50
Range of the rate of humidity change, % RH s−1	−2 to +2	−2 to +2	−2 to +2	−2 to +2
Units tested extensively	38	40	42	38
Units used for multiple regressions	20	20	20	20
Number of multiple regressions	62	66	58	60
Number of points per multiple regression	< 175	< 175	< 175	< 175
Mean correlation coefficient, r	0.94 ± 0.19	0.93 ± 0.17	0.95 ± 0.18	0.96 ± 0.17
Mean differential sensitivity to instantaneous   humidity, imp s−1 / % RH	+ 0.52	−0.60	+0.42	−0.31
Mean differential sensitivity to the rate of hu-   midity change, imp s−1 / % RH s−1	+5.11	−4.62	+2.51	−2.41
Stimulus: pressure
Range in which pressure oscillated, mbar	5 to 45	5 to 45	5 to 45	5 to 45
Range of the rate of humidity change, mbar s−1	−10 to +10	−10 to +10	−10 to +10	−10 to +10
Units tested extensively	32	34	46	44
Units used for multiple regressions	20	20	20	20
Number of multiple regressions	60	60	68	68
Number of points per multiple regression	< 80	< 80	< 80	< 80
Mean correlation coefficient, r	0.98 ± 0.09	0.98 ± 0.09	0.97 ± 0.12	0.98 ± 0.11
Mean differential sensitivity to instantaneous   humidity, imp s−1 / mbar	+0.14	−0.16	+0.77	−0.45
Mean differential sensitivity to the rate of hu-   midity change, imp s−1 / mbar s−1	+0.15	−0.18	+0.52	−0.38