Fig. 3. Habituation/generalization (H/G) trials of C. tenera (N=3–6) stimulus duration discrimination. 5–10, habituation pulse trains of pulse durations of 5 ms, test pulse train of pulse duration of 10 ms, equal and unequal duty cycles; 10–5, habituation pulse trains of pulse durations of 10 ms, test pulse train of pulse duration of 5 ms, equal and unequal duty cycles. Values are means + 1 s.d., sample sizes in parentheses; asterisks mark significant differences (P<0.05).