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Fig. 2. Experiment 1 (passive hearing): classification of filtered impulses by
three bats (A–C) and their means ± s.e.m. (D). The performance is
plotted as percentage of highpass classification versus the filter
slope. Trials with presentation of white-noise background are shown with black
symbols, and trials with pink-noise background are shown with red symbols. The
two training/control conditions (±6 dB/octave and white noise) are
indicated with open symbols. The grey bars show the difference in highpass
classification between pink- and white-noise background. Their mean difference
across all six filter slopes (indicated by M) is shown as a black bar. The
perceptual classification boundaries per background are indicated by vertical
lines in the lower part of each panel (black, white-noise background; red,
pink-noise background). The shift in the perceptual classification boundary
from white- to pink-noise background is given above the vertical lines in
units of dB/octave. Only the mean perceptual classification boundary could be
tested for significance. *P<0.05,
**P<0.01.
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