Fig. 3
From: Scorpionfish rapidly change colour in response to their background
Achromatic and chromatic contrasts of scorpionfish body against the background are above detection threshold. Achromatic contrast from A Tripterygion delaisi and B Pomatoschistus flavescens visual perspective in Just Noticeable Differences (JNDs). Chromatic contrasts from C T. delaisi and D P. flavescens visual perspective in JNDs. Dashed line = detection threshold of one JND. S. m. = Scorpaena maderensis, S. p. = S. porcus. All panels show model estimates and raw data for all combinations of background, species and observer. Each point represents a measurement for each individual fish (N = 24 S. maderensis, N = 18 S. porcus) averaged over the two time points (after one and five minutes adaptation time to the backgrounds, see Methods). Markers with vertical bars represent predicted mean and 95% compatibility intervals (CIs) derived from 10,000 simulations of the posterior distribution of model parameters. The strength of the difference between two groups increases with decreasing degree of overlap of their 95% CIs