There are many kinds of collective and joint activities, as we all know. We can jointly write a paper, carry a table, sing a duet, and perform a toast to somebody. We can collectively conserve energy, vote in elections, love or fear supernatural beings, follow norms, create and uphold social institutions. Furthermore, crowds and organized groups can behave in meaningful ways e.g. a crowd can tr...

In this paper, we address the problem of under-determined Blind Source Separation (BSS) of anechoic speech mixtures. We propose a demixing algorithm that exploits the sparsity of certain time-frequency expansions of speech signals. Our algorithm merges `-basis-pursuit with ideas based on the degenerate unmixing estimation technique (DUET) [1]. There are two main novel components to our approach...

Exchange of vocal signals is an important aspect of animal communication. Although birdsong is the premier model for understanding vocal development, the development of vocal interaction rules in birds and possible parallels to humans have been little studied. Many tropical songbirds engage in complex vocal interactions in the form of duets between mated pairs. In some species, duets show preci...

Few studies have examined the impact of mosquito adulticides on honey bees under conditions that reflect actual field exposure. Whereas several studies have evaluated the toxicity of mosquito control products on honey bees, most have been laboratory based and have focused solely on acute mortality as a measure of impact. The goal of this study was to determine effects of routine applications of...

The question of why animals participate in duets is an intriguing one, as many such displays appear to be more costly to produce than individual signals. Mated pairs of yellow-naped amazons, Amazona auropalliata, give duets on their nesting territories. We investigated the function of those duets with a playback experiment. We tested two hypotheses for the function of those duets: the joint ter...

The purpose of the article is to highlight piano ensemble genre in cultural and historical discourse process its formation development. research aimed trace gradual dynamics accordance with process; identify main modifications mastering evolution. methodology conceptual provisions theory; system-analytical, art comparative approaches as a methodological basis for study genres. scientific novelt...