"The current situation in the world, and especially the threat of terrorism, creates a demand for new technologies that allow observation of human psychophysiological reactions without entering into direct contact with the person and without that person’s knowledge, to evaluate the person’s honesty (deception), intentions, hidden information, and information provided. This has resulted in a revival of interest in devices and techniques for investigating emotional changes in the sound of the human voice (Widacki 2007)."(...)