Fig. 1. Behaviour of crayfish in response to noxious thermal stimuli.

(A,B) Thermal images of (A) soldering iron tip and (B) crayfish immediately after being touched by soldering iron. (C,D) Response of crayfish touched on the claw with (C) high temperature stimulus or (D) low temperature noxious stimulus. (E) Proportion of crayfish responding to touch on claw with high temperature stimulus. n = 11. (F) Latency of response to touch on the antennae. No response within 30 s was coded as 30 s. Dot = mean; line dividing box = median; box = 50% of data; whiskers = 95% of data; asterisks = minimum and maximum. n = 11.