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Fig. 13. Schematic time-frequency spectrogram illustrating how the harmonics of
notes in vocalizations with frequencies between
4 and 8 kHz (i.e.,
harmonics of fundamental frequencies between
2 and 4) might degrade
temporal patterns across preceding or subsequent notes when these preceding or
subsequent notes are produced with fundamental frequencies between
4 and
8 kHz. (A) Illustration where second harmonics are `weakly attenuated' between
4 and 8 kHz. Arrows point to where harmonics occur and how the
frequencies of these harmonics correspond with hypothetical sound frequency
channels defined on the left side of the figure. (B) Illustration where second
harmonics are `strongly attenuated' between
4 and 7.5 kHz.