Fig. 9.

Response duration to cat-attracting plants over time. Each dot represents data (total response time) of one cat. When all plants were compared, each dot shows the median value of the total response durations to the 5 cat-attracting plants. A The total response duration of 6 cats to 5 cat-attracting plants during the first 5 testing days (50 h; weeks 1–2) was compared to the total response time during the 5 testing days (50 h) during weeks 4–5 (Additional file 1: Figure S2A). The test periods of 2 weeks were separated by a 9-day interstimulus interval. B Total daily response time of 6 cats during the first (days 1 and 6) and last day (days 5 and 10) of both 2-week testing periods. Cat H did not participate in testing V. officinalis. For all statistical analyses, the paired, non-parametric Wilcoxon matched-pairs signed rank test was used. All P values were > 0.05. Only P values < 0.1 are shown