Mattias Heldner

Mattias Heldner is Professor of Phonetics and Head of Department at the Department of Linguistics, Stockholm University. He also serves as Director of the Phonetics Laboratory where he has developed advanced recording facilities for breathing movements and voice quality dynamics in conversation.

Dr. Heldner received his PhD in Phonetics from Umeå University in 2002, completed a postdoc at TeliaSonera Sweden in 2005, became Docent in Speech Communication at KTH Royal Institute of Technology in 2007, and was appointed Professor in Phonetics at Stockholm University in 2011.

His research focuses on communicative behavior relevant for turn-taking in conversation and signaling of prosodic functions such as prominence and boundaries. His work spans multiple dimensions of speech communication, including:

• Respiratory patterns and their role in conversation flow
• Voice quality dynamics as turn-taking cues
• Prosodic functions in spontaneous speech
• Physiological constraints in verbal communication
• Acoustic properties of child speech development
• Neural correlates of lexical stress

Dr. Heldner's recent publications demonstrate how respiratory signals provide crucial information for predicting speech activity and managing turn-taking. His research combines physiological measurements with acoustic analysis to uncover hidden aspects of conversational organization, particularly the relationship between breathing patterns and speech timing.

As an educator, Dr. Heldner has taught phonetics courses for Speech and Language Pathology students at Karolinska Institutet, University of Gothenburg, and Umeå University. He currently supervises one PhD student and has successfully supervised two PhD theses to completion.

Dr. Heldner has held several Swedish research grants and served as one of the Technical Program Chairs for Interspeech 2017 in Stockholm. His Phonetics Laboratory has developed innovative systems like RespTrack for measuring respiratory movements during speech with high experimental control.