Table 1.

Behaviour of female crickets (1 or 3 weeks old) responding to control male signals and signals changed by the electromagnetic field

			Movement angle		Net movement time		Net distance
Treatment	Age	Period	t/Z	P	t/Z	P	t/Z	P
a. Comparisons with a theoretical value of 0 (one-sample t-tests)
Changed	1 w	1st	1.41	0.202	1.31	0.230	1.87	0.103
Changed	1 w	2nd	8.85	< 0.001*	15.32	< 0.001*	41.72	< 0.001*
Changed	3 w	1st	0.17	0.867	0.66	0.529	0.86	0.417
Changed	3 w	2nd	3.67	0.008*	3.70	0.008*	5.21	0.001*
Control	1 w	1st	1.38	0.210	0.59	0.576	0.58	0.579
Control	1 w	2nd	1.07	0.318	1.29	0.237	1.43	0.196
Control	3 w	1st	2.36	0.050	3.00	0.020	2.32	0.053
Control	3 w	2nd	4.27	0.004*	4.89	0.002*	2.49	0.042
b. Comparisons between the first and second observation periods (Wilcoxon tests)
Changed	1 w		− 2.52	0.012*	− 2.52	0.012*	− 2.38	0.017
Changed	3 w		− 0.98	0.327	− 0.98	0.327	− 0.70	0.484
Control	1 w		− 2.24	0.025	− 1.68	0.093	− 1.40	0.161
Control	3 w		0.00	1.000	− 0.84	0.401	− 0.14	0.889
c. Comparisons between treatments (Mann–Whitney tests)
	1 w	1st	− 2.10	0.036	− 1.26	0.208	− 1.58	0.115
	1 w	2nd	− 2.94	0.003*	− 2.74	0.006*	− 2.74	0.006*
	3 w	1st	− 1.37	0.172	− 1.16	0.248	− 0.63	0.529
	3 w	2nd	0.00	1.000	− 0.21	0.833	− 0.42	0.674
d. Comparisons between cricket ages (Mann–Whitney tests)
Changed		1st	− 0.53	0.600	− 0.32	0.753	− 0.32	0.753
Changed		2nd	− 2.42	0.016	− 2.27	0.023	− 2.59	0.010*
Control		1st	− 2.10	0.036	− 1.58	0.115	− 1.79	0.074
Control		2nd	− 0.84	0.401	− 0.95	0.344	− 0.63	0.528

Treatments: changed–changed signal treatment, control–control treatment. Ages: 1 w, 1 week; 3 w, 3 weeks. Periods: 1st, the first 5-min period (the control signal for all individuals); 2nd, the second 5-min period (the changed or control signal, depending on the treatment). Net movement time/distance – relative difference between times/distances moved towards vs. away from the signal

Asterisks indicate significant differences after applying the sequential Bonferroni corrections for multiple comparisons