Studies of trilled vocalizations provide a premiere illustration of how performance constraints shape the evolution of mating displays. In trill production, vocal tract mechanics impose a trade-off between syllable repetition rate and frequency bandwidth, with the trade-off most pronounced at higher values of both parameters. Available evidence suggests that trills that simultaneously maximize ...

Glucocorticoids regulate glucose concentrations and responses to unpredictable events, while also modulating cognition. Juvenile Belding's ground squirrels (Urocitellus beldingi) learn to respond to whistle and trill alarm calls, warning of aerial and terrestrial predators, respectively, shortly after emerging from natal burrows at one month of age. Alarm calls can cause physiological reactions...

The ARP-Path protocol has flourished as a promise for wired networks, creating shortest paths with the simplicity of pure bridging and competing directly with TRILL and SPB. After analyzing different alternatives of ARP-Path and creating the All-Path family, the idea of migrating the protocol to wireless networks appeared to be a good alternative to protocols such as a AODV. In this article, we...

This article reviews research on vocal vibrato and related phenomena. As the vibrato corresponds to a modulation of the fundamental frequency, the primary acoustic attributes are the@equency and amplitude of this modulation as well as its waveform. The range of variation of these parameters in classical operatic singing are discussed as well as the boundaries to similar phenomena such as tremol...

Mate advertisement signals can vary in their variability, with some or signal components being highly stereotyped and others variable. One hypothesis for differences variability suggests that receivers provide stabilizing selection important mate recognition, resulting low while also providing directional indicating quality, correlating greater variability. Factors affect efficacy, however, inf...

The paper presents a system for manner-based labelling of the speech signal for isolated words from total energy profile. The manner-based classes selected are sibilant, vowel, nasal murmur, semi vowel and lateral, trill, unvoiced unaspirated interrupt, unvoiced aspi rated interrupt, voiced unaspirated interrupt , voiced aspirated interrupt and consonant clusters. The results of labeHing for 10...

In preparing for my presentation, I was recommended several review articles from compilations on bird vocalizations. I based much of my presentation on this particular review. It is a bizarre combination of a little bit of ethology and a good many predictions on how environmental features should influence the evolution of characteristics of bird song such as frequency, amplitude, modulatory emp...

The Medumba consonant inventory includes plain and prenasalized bilabial trills /ʙ, mʙ/, which contrast with bilabial stops. The trills occur most often before the central vowels /ʉ̜ ə/, while they are not attested before /u/. The central vowel /ʉ̜/ has a vowel posture that is particularly conducive to trilling of the lips: it does not form a circular opening, the corners of the mouth are drawn s...