Figure 2. Detection threshold in mice is proportional to kairomone strength (mean±SEM).

The detection threshold at varying doses of rat urine was further examined by setting up an avoidance-avoidance conflict, where mice chose to spend time in arms containing either lower or higher amounts of rat urine. The higher dose was of either a 20% (un-shaded bars) or 30% (shaded bars) greater magnitude (e.g. 120% or 130% of 2X). Abscissa depicts the lower dose used in each of the comparisons (e.g. 2X). Ordinate depicts time spent in arm with the greater amount of rat urine divided by the sum of the time spent in both arms (gray line = 50% chance). N = 15 mice for all comparisons.Log ₂ scale; arbitrarily set as 3.125 µl of rat urine.