This study investigates how body position affects the relative contribution of the rib cage to speech breathing and voice quality. The frequently used upright and supine body positions are expanded with the addition of an inverted position as a condition. Five participants performed two speech production tasks across the three body positional conditions. The estimation of the relative contribution of the rib cage to speech breathing was obtained through respiratory inductance plethysmography (RIP). Phonation type was estimated through the usage of the α-ratio, obtained with a neck-surface accelerometer. The results between the participants suggest a pattern regarding levels of the relative contribution of the rib cage in relation to phonation type, which offers opportunities for further investigation in future research. / Den här studien undersöker hur kroppsposition påverkar det relativa bidraget av bröstkorgen för talandning och röstkvalité. Den frekventa användningen av upprät och supin kroppsposition utvidgas med en inverterad position som villkor. Fem forskningspersoner genomförde två talproduktionsuppgifter genom de tre kroppspositionsvillkoren. Uppskattningen av det relativa bidraget av bröstkorgen för talandning var erhållen genom respiratory inductance plethysmography (RIP). Fonationstyp var uppskattad genom användningen av α-ratio, erhållen med en ytligt hals-placerad accelerometer. Resultaten mellan deltagarna föreslår ett mönster för nivåer av det relativa bidraget av bröstkorgen relaterat till fonationstyp, som ger möjligheter för vidare undersökning i framtida forskning.

This thesis explores the relationship between inhalation amplitude and turn-taking in spontaneous multiparty conversations held in Estonian. Respiratory activity is recorded with Respiratory Inductance Plethysmography. The main focus is on how inhalation amplitude varies between the inhalations produced directly before turn onset compared to the following inhalations within the same speaking turn. The results indicate a significant difference in amplitude, realised mainly by an increase in inhalation end lung volume values. One of the possible functions of this pattern is to signal an intention of taking the conversational turn. Another could be a phrasing or grouping function connected to lower inhalation amplitudes within turns. / 2014-1072 Andning i samtal (Vetenskapsrådet)