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Figure 1


Fig. 1. Filter transfer functions and amplitude spectra of example stimuli. (A) Experiment 1 (passive hearing). (B) Experiment 2 (echolocation). The graphs on the left show the transfer functions of the filters used to generate the foreground stimuli and the noise background. The graphs on the right show examples of the amplitude spectra of the finally presented stimuli, i.e. after convolution of the filters with a foreground signal (an impulse or a recorded echolocation call) and with white noise. FS, full scale. Thick lines, noise background (filter slope of 0 dB/octave or –3 dB/octave); thin lines, foreground stimuli (filter slopes from –6 dB/octave to +6 dB/octave). The amplitudes of the spectra do not illustrate the amplitude of the finally presented stimuli, which cannot be easily compared and additionally depend on the applied attenuation and on the call amplitude.





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