Fig. 3. Results of oviposition tests. (A) Choice distributions of the drumming reactions for different pairs of stimuli. Both stimuli of a pair had the same colour and intensity; YG2 was used in most tests, but BG1 was used in the left-hand test. Symbols on the abscissa show the polarisation angle of stimuli; from left to right: both stimuli horizontally polarised (=90°), =90° versus =45° (obliquely polarised light), =90° versus =0° (vertically polarised light) and so on. n is the number of choices in each test. Asterisks mark choice distributions that differ significantly from chance (G-tests, P<0.001); the remaining choice distributions do not differ from chance (P>0.1). (B) Choice distributions of curling reactions (open columns) and egg-laying (coloured columns) during the same tests as in A. Bold values of n above the columns give the total number of eggs, values of n in normal type give the total number of curling reactions in each experiment. Asterisks for the respective behavioural reactions are as in A; double daggers mark choice distributions where n was too small to obtain a significant result (P<0.1, binomial test); unmarked choice distributions to not differ from chance (G-tests, P>0.5). (C) Choice frequencies of drumming reactions for the brighter of two unpolarised stimuli with equal spectral distribution. The colour Gr was used for the spectral distribution (see Fig.1A). Asterisks are as in A.