Furutani Akari, Mori Chihiro, Okanoya Kazuo
Graduate School of Arts and Sciences, The University of Tokyo, Meguro, Tokyo, Japan.
Graduate School of Arts and Sciences, The University of Tokyo, Meguro, Tokyo, Japan; Postdoctoral Research Fellow, Japan Society for the Promotion of Science, Japan.
Behav Processes. 2018 Dec;157:68-72. doi: 10.1016/j.beproc.2018.08.010. Epub 2018 Aug 26.
Bird vocalizations are often differentiated using terms such as "song" and "call." The Java sparrow (Lonchura oryzivora) uses several calls in different behavioral situations; notably, they produce similar calls in disparate situations of aggressiveness or affinity. These calls are composed of short syllables with narrow intervals repeated in quick succession. We distinguished these "trill-calls" as either aggressive or affiliative trills based on behavioral context. We compared the sound pressure levels, frequency of maximum amplitude, entropy, and repetition rate of the two types of trills. Sound pressure level and entropy were higher and trill rate was faster in aggressive trills than in affiliative trills. As these two similarly composed but distinct trill-calls are used in disparate interactive contexts, they could serve as a model system to study the relationship between communicative behavior and brain activity.
鸟类的发声通常用“歌声”和“叫声”等术语来区分。爪哇雀（爪哇禾雀）在不同的行为情境中会发出几种叫声；值得注意的是，它们在不同的攻击性或亲密性情境中会发出相似的叫声。这些叫声由短音节组成，音节之间间隔狭窄，快速连续重复。我们根据行为背景将这些“颤鸣叫声”区分为攻击性颤鸣或亲密性颤鸣。我们比较了两种颤鸣的声压级、最大振幅频率、熵和重复率。攻击性颤鸣的声压级和熵更高，颤鸣速率比亲密性颤鸣更快。由于这两种组成相似但不同的颤鸣叫声用于不同的互动情境，它们可以作为一个模型系统来研究交流行为与大脑活动之间的关系。
