Tonic immobility of Porcellio scaber induced by different treatments: a probability of inducing TI by the first, the second and the third treatment b probability of inducing TI by different treatments c endurance of TI following the first, the second and the third treatment d endurance of TI following different treatments e sensitivity, i.e. promptness of inducing TI by the first, the second and the third treatment f sensitivity, i.e. promptness of inducing TI by different treatments. (*** p < 0.001; ** p < 0.01; * p ≤ 0.05)