Biomedical subjects

J J Mahshie

Publications and source records attributed to J J Mahshie.

4 recordsLinked to original sources

PubMed1988

Monitoring vocal fold abduction through vocal fold contact area.

A number of commercial devices for measuring the transverse electrical conductance of the thyroid cartilage produce waveforms that can be useful for monitoring movements within the larynx during voice production, especially movements that are closely related to the time-variation of the contact between the vocal folds as they vibrate. This paper compares the various approaches that can be used to apply such a device, usually referred to as an electroglottograph, to the problem of monitoring the time-variation of vocal fold abduction and adduction during voiced speech. One method, in which a measure of relative vocal fold abduction is derived from the duty cycle of the linear-phase high pass filtered electroglottograph waveform, is developed in detail.

Electric Conductivity↗

PubMed1988

Speech training aids for hearing-impaired individuals: I. Overview and aims.

Prelingual profound deafness typically results in aberrant or unintelligible speech production. For approximately 70 years, researchers and engineers have attempted, with little success, to provide electronic aids for speech training. Recent computer and signal processing technology has provided the impetus for several groups to implement new speech training aids. Following a review of deaf speech characteristics, several current computer-based aids are described. Included among those reviewed are two interrelated speech training aids which resulted from collaboration among the authors.

Child↗

PubMed1988

Speech training aids for hearing-impaired individuals: III. Preliminary observations in the clinic and childrens' homes.

Preliminary evaluation of 2 related computer-based speech training and practice aids for profoundly deaf children was conducted. The Speech Training Station (STS) uses both acoustic and physiological transducters for assessment and training in a school of clinic. The Speech Practice Station (SPS) uses the acoustic signal, and was designed primarily for use in the home. A series of games and activities was implemented on the 2 systems. Use of the STS was evaluated by 2 speech clinicians during a 15-month period. Fifteen children were subjects in the evaluation. The aid was found to be easily incorporated into clinic activities and useful for diagnosis and therapy. The SPS was evaluated during a 1-to-2-week period, during which it was placed in the homes of 5 profoundly deaf children. Using an activity log and questionnaire completed by the childrens' parents, usage statistics and impressions were obtained. Potential value and problems with such aids are discussed.

Child↗

PubMed1983

Deaf speakers' laryngeal behavior.

The purpose of this study was to compare deaf speakers' (n = 4) laryngeal behavior during voiced and voiceless consonant productions to that of normal hearing subjects (n = 4). Laryngeal behavior during these two speaker groups' productions of six word-initial stop plosives (/b d g p t k/) and fricatives (/v z delta f s pheta/) was visually observed by means of a flexible fiberoptic nasolaryngoscope (fiberscope). The visualizations and their acoustic correlates were audiovisually recorded. The audiovisual recordings were analyzed by means of both frame-by-frame categorical judgments of laryngeal behavior and broad phonetic transcriptions of the accuracy/inaccuracy of consonantal voicing. Results indicated that deaf speakers' laryngeal behavior during production of those consonants perceived as accurately voiced was comparable to that of normal speakers, whereas deaf speakers' laryngeal behavior during production of consonants perceived as inaccurately voiced generally differed in various ways from normal. Findings seem to suggest that some aspects of deaf speakers' atypical laryngeal behavior associated with inaccurately voiced consonants may be due to an aberrant linguistic system while other aspects may be due to inadequate laryngeal motor control.

Adult↗