Fig. 2. (A–D) Mean psychometric functions for all bats for the time-variant peak detection for the tested modulation rates (MR) of 2, 4, 8 and 16 Hz, respectively. Plotted are percent correct decisions as a function of the modulation depths; the significant threshold level was set to 75%. Each panel depicts the psychometrics curves for all animals as a function of modulation depth. The threshold is calculated as a mean value for all bats.