ABSTRACT
This chapter presents an overview of the theoretical foundations pertinent to research on deception. It also focuses on the relevance of different theoretical frameworks for the investigation of deception and speech. Initial research on deception was motivated by the wish to locate a cue or behaviour that would reliably indicate that a deception was taking place. In order to discover potential correlations between speech and stress the majority of empirical research has employed laboratory experimental designs to induce stress which is usually referred to as emotional stress, situational stress, laboratory stress, task-induced stress and physical stress. The chapter presents a selection of key research with the focus on the acoustic and temporal characteristics of stress; a parameter-centred description is adopted. A major focus of analysis of speech under cognitive load has been the investigation of temporal parameters. The literature on the acoustic and phonetic characteristics of clear speech is relatively sparse compared to other areas of affective speech research.
