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Fig. 3. There was a latency to respond to the light pulse during testing in
conditioned (CS+) animals (N=6, black line) but not control
(CS–) animals (N=6, grey line). In the first 30 s of the 1 min
test period (intervals 1–6) behaviours were similar in the two
treatments, but in the latter half of the test period (intervals 7–12,
black double-headed arrow) the tentacle extension response (TER) of
conditioned animals (A) and ventilation rate (B) increased. Graphs show the
means ± 1 s.e.m. of behaviour in each 5 s interval in the 6 h retention
test.