title: Electroglottographic contact quotient in different phonation types using different amplitude threshold levels.
abstract: Contact quotient (CQ), measured by electroglottogram (EGG), is a ratio which illustrates the duration of vocal fold contact during one vocal fold period. In the present study CQ(EGG) was calculated from a sustained vowel phonation in three different phonation types (breathy, normal, pressed) at three amplitude threshold levels (25%, 35%, 50%). CQ(EGG) values were compared with experts' perceptual evaluation of the firmness of phonation. The contact time of the vocal folds differed significantly between the different phonation types at all threshold levels (P < 0.01). Perceptual evaluation correlated best with CQ(EGG) at threshold levels 25% and 35%. The results of the linear regression model suggested that by using threshold level 25% the effect of F0 and SPL on CQ(EGG) were not significant.
authors.affiliation: University of Tampere, Speech and Voice Research Laboratory, School of Education, Tampere, Finland. elina.kankare@uta.fi
authors.forename: Elina
authors.initials: E
authors.lastname: Kankare
authors.forename: Anne-Maria
authors.initials: AM
authors.lastname: Laukkanen
authors.forename: Irma
authors.initials: I
authors.lastname: Ilomäki
authors.forename: Anne
authors.initials: A
authors.lastname: Miettinen
authors.forename: Tiina
authors.initials: T
authors.lastname: Pylkkänen
mesh_terms: D000162:Acoustics; D000328:Adult; D000704:Analysis of Variance; D001307:Auditory Perception; D004568:Electrodiagnosis / Q000379:methods*; D005260:Female; D005931:Glottis / Q000502:physiology*; D006801:Humans; D016014:Linear Models; D008875:Middle Aged; D015588:Observer Variation; D010699:Phonation; D015203:Reproducibility of Results; D012684:Sensory Thresholds; D013061:Speech Acoustics; D013068:Speech Production Measurement; D013997:Time Factors; D014827:Vocal Cords / Q000502:physiology; D014833:Voice Quality; D055815:Young Adult