Fig. 1. Jamming avoidance responses (JARs) in interacting pairs of Brachyhypopomus pinnicaudatus. Different pairs in A and B. Inter-EOD event intervals (ms) as a function of ongoing time (s). Female, red trace; male, blue trace. Mean intervals estimated from portions without transient interval shortenings. (A) Interval ratio of female to male close to 1:1 (in the laboratory). Mean intervals during the interaction: female, 19.5 ms; male, 20 ms. (B) Interval ratio of female to male close to 2:1 (natural environment). Mean intervals during the interaction: female, 36.0 ms; male, 18.0 ms.