Figure 4: High air pressures cause aperiodic larynx phonations. | Nature Communications

Figure 4: High air pressures cause aperiodic larynx phonations.

From: Behavioural and neurobiological implications of linear and non-linear features in larynx phonations of horseshoe bats

Figure 4

Below 2.1 kPa, changes are similar to those shown in Fig. 3. Above 2.1 kPa, the tonal (periodic) signal suddenly becomes aperiodic. Similar aperiodic components are also part of natural communication (Commun.) calls. (a) Increases in air pressure, (b) bandwidth of sound signal 30 dB below max sound amplitude, (c) sonogram of produced sound and (d) waveform of sound signal for sudden transition between periodic and aperiodic sound emission (red box). (e,f) Effects of changes in absolute air pressure on relative amplitude (e), as well as sound frequency (f, left ordinate and blue and red dots) and signal bandwidth (f, bottom, right ordinate and pink squares). Same larynx preparation as in (a–d). Data represent averages of ten increases and decreases of air pressure, each. Vertical bars in e,f represent s.d. and vertical dashed lines indicate the range of air pressure for rapid shifts between F1high and F1low. (g,h) Transition between periodic and aperiodic components in sonagram (g) and waveform (h, red box) of natural communication call of R. f. nippon. Rel., relative.

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