Fig. 7. The effects of the four significant terms that influence the crab's probability of response (see Table 1). (A) The distance of the dummy track from the crab's burrow (track distance; see Fig. 6). The histogram shows the number of experiments where the crabs responded (black) and the number of experiments where the crabs did not respond (grey) for a number of different track distances (right scale). The dotted line connects the probability of response for each bin of the histogram (left scale). The solid line shows the probability of response as fitted by the statistical model. (B) The effects of track angle and crab side (see Fig. 6). The vertical bars show the probability of response based on the raw data for the different approach directions, and the solid lines are fitted values based on the statistical model (grey, crab side = 0; black, crab side = 1). (C) The effect of repeated dummy presentations on the probability of response. The dotted line shows the probability of response over the number of successive dummy presentations. The model fit is shown by the grey dots joined by a solid line. The number of experiments for each value of presentation repeat, i.e. the number of crabs contributing to this value, is indicated by the histogram at the bottom of the figure. The two shades of grey group the values of presentation repeat that correspond to the six levels fitted in the statistical model.

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