Fig. 8. Model fits for the position of the dummy relative to the burrow and the crab at the time of response for a crab-burrow distance of (A) 15 cm and (B) 25 cm. The fits are made for all dummy approach directions (track angles) and crab side values (see Fig. 1C) used in the model (Hemmi and Zeil, 2003a). For each track angle/crab side combination, we plotted the dummy's trajectory as a solid line from a distance of 50 cm to the burrow until the crab reacted (dot). For example, the black line at the top of A, just above and slightly to the left of the crab symbol, shows the approach path of a dummy for a track angle of 10° (0-20° track-angle bin) at the median track distance of 10 cm and a crab-side value of one. The crab initiates the reaction when the dummy reaches the black dot at the end of the line. The radius of the solid circle equals the fitted mean of all response distances ±2 S.E.M. (dotted circles). (C) and (D) show the same data in retinal coordinates as seen by the crab. The continuous and dotted lines in C and D are the projection of the mean response distances ±2 S.E.M. (circles in A and B).