|
| |
|
|
|
|
||||
| Home Help Feedback Subscriptions Archive Search Table of Contents | ||||
|
Fig. 9. Unequal contribution of right and left sides to bilaterally produced chaos.
Chaotic sounds often contained harmonic windows, or brief moments of periodic
oscillation, such as that seen around arrow b. Mockingbird `loud hew' calls
(A) were always produced with flow through both sides of the syrinx for the
entire duration of the call. In most cases (56 of 67 calls) one side alone
appeared to contribute the majority of the aperiodicity in the call, while the
contribution of the other side is more pure-tonal. (B) The difference in
aperiodic behavior of the two sides is shown by examination of sound recorded
inside the right and left bronchi and cranial thoracic air sac (obtained by
high-pass filtering and amplifying thermistor and pressure transducer
outputs). (C) 20 ms segment of the sound waveform, at the time indicated by
arrow a in the spectrogram, illustrating the aperiodic nature of the
oscillation. (D) Power spectrum of the sound taken at arrow a in the
spectrogram (A). Additionally, the airflow in the right side
(FR) shows an aperiodic, rapid modulation, which are not
present in the flow on the left (fL). Other abbreviations
as in Fig. 3.
|
