Aural harmonics: the tone-on-tone masking vs. the best-beat method in normal and abnormal listeners.
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Audiometry↗
Biomedical subjects
F H Bess
Publications and source records attributed to F H Bess.
Group amplification in schools for the hearing impaired.
In the present field study, ambient noise levels and the status of group FM-wireless amplification systems were examined in 19 classrooms for the hearing impaired. Classroom noise was judged to be unacceptably high thus justifying the need for group amplification devices. Physical inspection of the group systems revealed defects in approximately one-half of the 28 teacher and 89 student amplification units. The electroacoustic measurements showed wide variability in performance among systems. There also appeared to be no systematic relationship between the degree of hearing loss of the children and the amount of unit gain being employed by each specific amplification system.
Amplifiers, Electronic↗
The minimally hearing-impaired child.
This paper reviews evidence which suggests that middle ear disease with effusion and associated hearing loss, unilateral sensorineural hearing impairment, and mild bilateral sensorinural hearing loss in children can result in far more educational and/or communicative difficulty than was previously supposed. The author rejects the notion that a decibel level on an audiogram truly reflects the degree of hardship the child experiences and argues for a more active identification and management program in the early years.
Auditory Threshold↗
Attenuation characteristics of recreational helmets.
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Adult↗
Impedance screening for children. A need for more research.
Two sets of recommendations for impedance screening have been generated recently for use with preschool and school age children. One set of these recommendations, developed in Nashville, purports that it is premature to mass-screen on a routine basis for the detection of middle ear disease. These recommendations do encourage, however, the screening of special populations of children considered at risk for otitis media. This paper offers support for Nashville recommendations and suggests that there is a critical need for additional research before we begin to screen in mass. Areas in need of further research and clarification included the use of impedance as a screening tool, natural history and medical management of middle ear disease, and the educational and linguistic complications of middle ear disease. Hence, while the potential value for screening is recognized by the Nashville recommendations, they also recognize the need for more study of the procedure and the disease.
Acoustic Impedance Tests↗
A test battery approach to the investigation of susceptibility to temporary threshold shift.
This study examined individual differences among various psychophysical measures that have been suggested previously as predictors of susceptibility to noise-induced temporary threshold shift (TTS). The test battery was administered to a group of five normal-hearing young adults and consisted of the following procedures: (1) critical intensity (CI) at 2 kHz; (2) loudness discomfort level (LDL) at 0.5, 1, 2 and 4 kHz; (3) aural overload thresholds at 0.5, 1 and 2 kHz. Three measures of TTS, one employing a broad-band noise as the exposure stimulus and two others using tonal fatiguers, were utilized to assess susceptibility to TTS. Results revealed that the test battery delineated tough from tender ears. Furthermore, the aural overload test was found to be a highly accurate predictor of TTS.
Acoustic Impedance Tests↗
Thresholds of aural overload, word discrimination in noise, and the "fragile ear".
This study examined the relationship between two previously proposed measures of the fragile ear, the aural overload test and word discrimination score in noise. Ten normal-hearing young adults served as subjects. Aural overload thresholds were determined for fundamental frequencies of 500, 1000, and 2000 Hz. Word intelligibility in noise was assessed with tests using an open response-set (Northwestern University Auditory Test No. 6) and closed response-set (Modified Rhyme Test) at a variety of primary-to-secondary ratios. Results revealed a lack of correlation between threshold of overload and word discrimination in noise at unfavorable primary:secondary ratios for both tests(-6 and 0 dB for the NU-6' s and -12 and -6 dB for the Modified Rhythm Test). Significant correlations (p less than 0.05) were achieved, however, with both word discrimination tests when administered at the more advantageous primary:secondary ratios.
Acoustic Stimulation↗