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Results of Experiment 1: (a) heading perturbations. Mean absolute lateral deviation as a function of the number of neighbours in the perturbed subset S. Results of Experiment 2: (b) heading perturbations. Mean absolute lateral deviation as a function of the number and distance of perturbed neighbours. (c) Speed perturbations. Mean absolute change in speed as a function of same. Error bars = s.e. of mean. (Online version in colour.)
