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Fig. 5. Responses to repeated looming stimulation. (A) Repeated presentations of
the same looming stimulus at 1 min intervals produce a progressive reduction
of the escape distance (open squares, left axis) and an increase in response
latency (filled circles, right axis) (N=14 crabs). (B) Repeated
stimulation with longer inter-trial intervals (3 min) causes less changes to
the escape distance and did not affect the response latency (N=15
crabs). Broken lines indicate the value of the mean response latency at first
trial.