Fig. 4: Swimming speeds across treatments.
From: Visual odometry of Rhinecanthus aculeatus depends on the visual density of the environment
a Mean swimming speeds varied with visual treatment but not proportionately with the modifications in spatial frequency. b The variability in swimming speed, measured as the residual swimming speeds from the treatment mean, increased with removal of translational optic flow. Box plots indicate the median, interquartile range, and notches compare medians between groups. Grey points indicate individual trials. Sample sizes across fish and treatments were as follows. Test 1: n = 268 (By fish: A, n = 43; B, n = 45; C, n = 45; D, n = 45; E, n = 45; F, n = 45), Test 2: n = 265 (By fish: A, n = 44; B, n = 45; C, n = 44; D, n = 44; E, n = 43; F, n = 45), Test 3: n = 176 (By fish: A, n = 45; B, n = 44; D, n = 43; E, n = 44), Test 4: n = 216 (By fish: A, n = 45; B, n = 44; D, n = 44; E, n = 41; F, n = 42).
