Figure 5.

Influences of diagnostic animal features on performance. (A) Presence of eyes. (B) Presence of a mouth (muzzle or beak according to the type of animal). (C) presence of four limbs in the photograph (only considers animals with legs). On the top row, reaction time distributions are represented (20-ms time bins). On the bottom row, the accuracy cumulated across time is represented for the presence or absence of a given characteristic. Vertical dotted lines indicate the earliest latency at which the χ² test became significant (315 for eyes; 351 for mouths; 328 for four limbs). Boxes show close-up views of the d′ curves within the dashed rectangles to better show the shift of the curves towards longer latencies in absence of the animal feature(s).