title: Acoustic and Auditory Perception Effects of the Voice Therapy Technique Finger Kazoo in Adult Women.
abstract: OBJECTIVE
  This study aimed to verify and to correlate acoustic and auditory-perceptual measures of glottic source after the performance of finger kazoo (FK) technique.
  
  
  METHODS
  This is an experimental, cross-sectional, and qualitative study.
  
  
  METHODS
  We made an analysis of the vowel [a:] in 46 adult women with neither vocal complaints nor laryngeal alterations, through the Multi-Dimensional Voice Program Advanced and RASATI scale, before and immediately after performing three series of FK and 5 minutes after a period of silence. Kappa, Friedman, Wilcoxon, and Spearman tests were used.
  
  
  RESULTS
  We found significant increase in fundamental frequency, reduction of amplitude variation, and degree of sub-harmonics immediately after performing FK. Positive correlations were measures of frequency and its perturbation, measures of amplitude, of soft phonation index, of degree and number of unvoiced segments with aspects of RASATI. Negative correlations were voice turbulence index, measures of frequency and its perturbation, and measures of soft phonation index with aspects of RASATI.
  
  
  CONCLUSIONS
  There was fundamental frequency increase, within normal limits, and reduction of acoustic measures related to presence of noise and instability. In general, acoustic measures, suggestive of noise and instability, were reduced according to the decrease of perceptive-auditory aspects of vocal alteration. It shows that both instruments are complementary and that the acoustic vocal effect was positive.
authors.affiliation: Speech Therapy Department, Associação Educacional Luterana-Bom Jesus/IELUSC, Joinville, Brazil. Electronic address: marakchristmann@gmail.com.
authors.forename: Mara Keli
authors.initials: MK
authors.lastname: Christmann
authors.affiliation: Speech Therapy Department, Universidade Federal de Santa Maria (UFSM), Santa Maria, Brazil.
authors.forename: Carla Aparecida
authors.initials: CA
authors.lastname: Cielo
mesh_terms: D000162:Acoustics; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001307:Auditory Perception; D003430:Cross-Sectional Studies; D005260:Female; D005385:Fingers; D006801:Humans; D007600:Judgment; D007830:Larynx / Q000033:anatomy & histology / Q000502:physiology*; D008046:Lip; D010699:Phonation; D036301:Qualitative Research; D012737:Sex Factors; D012815:Signal Processing, Computer-Assisted; D013061:Speech Acoustics; D013997:Time Factors; D014833:Voice Quality; D014834:Voice Training; D055815:Young Adult
keywords: Phonation; Rehabilitation; Speech acoustics; Voice quality; Voice training