Table 1.

Correlation coefficients of chemical concentration and the duration, amplitude, and spike frequency of response for midline spiking local interneurons tested with four different chemicals

NaCl						Sucrose
Neuron	RF	n	Dur	Amp	Sp	Neuron	RF	n	Dur	Amp	Sp
1	Ta	16	0.681-160	−0.06	0.61*	14	dFe	24	0.48*	0.36	0.36
2	dTi-Ta	6	0.72	0.73	0.961-160	15	dFE	10	0.68*	0.37	0.20
3	Ta	141-a	0.59*	0.50*	0.54*	16	dTi	22	0.671-160	0.17	0.32
4	dTi	28	0.841-160	0.63*	0.891-160	17	Ta	8	0.83*	0.72*	0.01
5	Ti-Ta	10	0.54	0.18	0.70*	18	Ta	211-a	0.741-160	−0.03	0.36
6	vFe	6	0.62	0.91*	0.77	19	dTi-Ta	4	11-160	0.40	11-160
7	Cp	4	0.95*	0.74	0.95*	20	dTi-Ta	4	11-160	0.20	0.80
8	Cp	8	0.78*	−0.39	0.71*	21	dTi-Ta	6	0.79	−0.09	0.85*
9	dFe	10	0.941-160	0.54	0.28	22	dTi-Ta	7	0.66	0.81*	0.40
10	dFe	4	0.95*	0.74	0.95*	23	Cp	8	0.76	0.951-160	0.76*
11	vFe	14	0.60*	0.26	0.16	24	dTi	21	0.09	0.27	0.41
12	dFe	10	0.871-160	0.70*		25	dFe	4	0.95*	−0.95*	0.21
13	Ti-Ta	7	0.27	0.11	0.03	26	dFe	9	0.75*	0.04	0.20

NHT						Lysine glutamate
Neuron	RF	n	Dur	Amp	Sp	Neuron	RF	n	Dur	Amp	Sp
27	Cp	9	0.72*	0.37	0.71*	35	dTi	22	0.751-160	0.22	0.561-160
28	dFe	14	0.02	−0.21	0.64*	36	Ta	4	0.74	−0.32
29	vTi	14	0.941-160	0.52	0.66*	37	PFe	10	0.08	0.66*	0.20
30	dTi	19	0.83	0.03	0.46*	38	dTi-Ta	8	0.03	0.18	0.57
31	dTi	13	0.781-160	0.781-160	0.781-160	39	Cp	28	0.67*	0.31	0.48*
32	dTi-Ta	18	0.72*	0.27	0.791-160	40	vFe	13	0.48	0.18	0.63*
33	dTi	18	0.691-160	0.47	0.45	41	dTi-Ta	17	0.681-160	0.31	0.53*
34	dFe	20	0.701-160	0.54*	0.29	42	dFe	23	0.581-160	0.35	0.43*
						43	dFe	6	0.85*	0.44	0.79
						44	dTi-Ta	9	0.831-160	0.18	0.951-160
						45	dFe	14	0.801-160	0.64*	0.761-160

Results of experiments in which individual spiking local interneurons were tested with increasing concentrations of one of the four test chemicals, unless indicated (

^F1-a), when the dose–response relationship of an individual neuron to more than one chemical was obtained. The duration (Dur), maximum amplitude of EPSP (Amp in mV), and number of spikes (Sp) in the responses to each application of a test solution were measured, and the Spearman's ρ correlation coefficients calculated, with n indicating the number of droplets applied. Significant correlations, in bold, are marked as follows:

^*p ≤0.05;

F1-160: p<0.01 and are indicated by solid lines in Figures 3 and 4. Receptive fields (RF) are indicated as follows: d, Dorsal; v, ventral; Fe, femur; Cp, cover-plate (distal femur); Ti, tibia; Ta, tarsus. Neuron number identifies the results of these analyses with graphical data in Figures3 and 4.