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Fig. 7. The post-pause recovery of efficiency {eta} in eliciting a novelty response. Means ± S.E.M. of {eta} are shown for the electrical stimulus (filled symbols) and for the mechanical stimulus (open symbols). The diagram comprises 972 responses of two fish (fish gc1, circles; fish gc2, squares) after a total of 486 pauses. The electrical stimulus (see Fig. 2) was given at various preselected values of n after 153 (gc1) and 120 (gc2) pauses; the mechanical stimulus (see Fig. 3) was given after 93 (gc1) and 120 (gc2) pauses. When given 20 electric organ discharges (EODs) after a pause, the electrical stimulus failed to elicit a response in either fish. Tentative courses of post-pause efficiency towards the `normal' efficiency ({eta}=1; indicated by the dotted horizontal line) are fitted by eye for the electrical stimulus (continuous line) and the mechanical stimulus (broken line).