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Fig. 2. Response frequencies to varying intensity of sound stimulation in pure air
or during attraction to four different pheromone stimuli. The response
frequency depended significantly on the sound intensity for all pheromone and
none pheromone stimuli (Spearman rank correlation: P<0.01,
r=0.886 for 1 component (comp.) 20 ng; P<0.0001,
r>0.950 for all other odours). Coloured bars illustrate mean
percentages of male moths responding by cessation of walking to sound
stimulation (20<N<25 for all treatments). Values represent data
means + S.E.M.