Fig. 4.

Classification of chaotic IRs by two P. discolor in a roving-level paradigm. Classification performance is plotted in the same format as in Fig. 3. The echoes in the training trials (horizontal lines) were attenuated by 6 dB relative to the main experiment. The echoes in the test trials were played back at randomized levels (±6 dB) roving around that of the training echoes. Note that the bats spontaneously classified the IRs in a similar way as shown in Fig. 3.