title: Perturbation measurements in untrained male voices' transitions from modal to falsetto register.
abstract: OBJECTIVE
  Voice periodicity during transitions from modal to falsetto register still remains an unclarified question.
  
  
  METHODS
  We examined the acoustic and electroglottographic signals of 20 healthy untrained male voices' transitions from modal to falsetto register on the vowels /a, e, i, o, u, and æ/.
  
  
  RESULTS
  In addition to discontinuities in fundamental frequency (F0), an independent increase of jitter, relative average perturbation, and shimmer was observed during and apparently caused by the register transition. In falsetto, the jitter was higher than in the modal register. The contact quotient derived from the electroglottographic signal tended to be lower for higher than for lower F0.
  
  
  CONCLUSIONS
  Register transitions are associated with increase of perturbation.
authors.affiliation: Institute of Musicians' Medicine, Freiburg University Medical Center, Freiburg, Germany. matthias.echternach@uniklinik-freiburg.de
authors.forename: Matthias
authors.initials: M
authors.lastname: Echternach
authors.forename: Johan
authors.initials: J
authors.lastname: Sundberg
authors.forename: Mark F
authors.initials: MF
authors.lastname: Zander
authors.forename: Bernhard
authors.initials: B
authors.lastname: Richter
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D008875:Middle Aged; D010507:Periodicity; D010699:Phonation; D013061:Speech Acoustics; D014831:Voice; D055815:Young Adult