Biomedical subjects

M A Redenbaugh

Publications and source records attributed to M A Redenbaugh.

3 recordsLinked to original sources

PubMed1989

Surface EMG and related measures in normal and vocally hyperfunctional speakers.

Surface electromyographic (EMG) signals were detected from the laryngeal area of 7 normal and 7 vocally hyperfunctional speakers during rest, two resisted-force maneuvers, vowel production, and connected speech. Vowel fundamental frequency, absolute and relative period perturbation, laryngeal-palpation ratings, and harshness ratings were acquired as well. The two groups differed significantly on all EMG measures except those associated with the resisted-force maneuvers, the vowel EMG-to-rest EMG ratio, and the speech EMG-to-rest EMG ratio. Moderately high correlations were evident between selected clinical measures and speech EMG values.

Adolescent↗

PubMed1985

Correspondence between an accelerometric nasal/voice amplitude ratio and listeners' direct magnitude estimations of hypernasality.

Miniature accelerometers were used to transduce nasal and anterior-neck tissue vibrations of 12 hypernasal and 3 normal children. The accelerometric voltages provided an analog implementation of Horii's (1980) nasal/voice ratio. Simultaneous audio recordings were later evaluated for hypernasality by listeners. Listeners' direct magnitude estimations (DME) of hypernasality were highly correlated with the accelerometric nasal/voice ratio when the stimulus sentences contained obstruents, nonnasal semivowels, and vowels. No correlation existed between DME and accelerometric values when the stimulus sentences contained primarily nasal semivowels and vowels.

Child↗

PubMed1985

Relation between nasal/voice accelerometric values and interval estimates of hypernasality.

Nasal/throat accelerometric ratios were obtained from 12 hypernasal and three normal children. The accelerometric voltages comprising the ratio were analogs of nasal and anterior-neck tissue vibrations. Audio recordings, which were obtained simultaneously with the accelerometric voltages, were later judged for hypernasality using an equal-appearing-interval (EAI) scale. High correlations were evident between accelerometric and EAI values when a stimulus sentence contained obstruents, semivowels, and vowels. No correlation existed between accelerometric measures and hypernasality judgments when a sentence contained primarily nasal phonemes and vowels.

Child↗