美国牛蛙雄性广告叫声中调制模式的信息论分析
Information theory analysis of patterns of modulation in the advertisement call of the male bullfrog, Rana catesbeiana.
作者信息
Suggs Dianne N, Simmons Andrea Megela
机构信息
Department of Psychology, Brown University, Providence, Rhode Island 02912, USA.
出版信息
J Acoust Soc Am. 2005 Apr;117(4 Pt 1):2330-7. doi: 10.1121/1.1863693.
Male bullfrogs often amplitude modulate the envelopes of the individual notes (croaks) in their multinote advertisement calls. These amplitude modulations change the envelope of the note from smooth and unmodulated to one with varying numbers of modulations. A Markov analysis shows the pattern of change in the envelope to be highly ordered, but not completely so (semi-Markovian). Three simple rules govern the presence or absence of modulations in individual notes. These rules are (1) all calls begin with an unmodulated note; (2) the first note to be modulated will contain only one modulation; and (3) when a change in modulation occurs from one note to the next, it does so with an increase or a decrease of one modulation only. The addition of modulations is correlated with an increase in note duration. Physiologically, the presence of modulations might increase the precision of temporal coding of note periodicities in the central auditory system.
雄性牛蛙在其多音符求偶鸣叫中，常常对各个音符（呱呱叫声）的包络进行幅度调制。这些幅度调制会使音符的包络从平滑且未调制状态变为具有不同调制数量的状态。马尔可夫分析表明，包络的变化模式具有高度的有序性，但并非完全如此（半马尔可夫性）。有三条简单规则决定单个音符中调制的有无。这些规则是：（1）所有鸣叫都以未调制的音符开始；（2）第一个被调制的音符将只包含一次调制；（3）当调制从一个音符变化到下一个音符时，只会增加或减少一次调制。调制的增加与音符持续时间的增加相关。从生理角度来看，调制的存在可能会提高中枢听觉系统中音符周期性时间编码的精度。
Zotero 插件