摘要:

ABR audiometry is now a widely used clinical procedure. Although the technique provides valuable information about peripheral hearing status and assists in the detection of a retrocochlear lesion, it possesses a number of pitfalls which may not be readily apparent. This report discusses some of the limitations and problem areas in ABR audiometry.

ISSN:0196-0202    

出版商:OVID    

年代:1983

数据来源: OVID

摘要:

The acoustical problems involved in matching the saturation sound pressure level for a 90 dB input signal (SSPL90) of a hearing aid to individual discomfort level were investigated. The real ear SPL (RE/SSPL90) produced by a supra-aural earphone used when measuring uncomfortable loudness (UCL), and RE/SSPL90produced by three different hearing aids at 90 dB SPL input, were measured for nine subjects, using a miniature microphone technique, and compared to the corresponding coupler levels used when matching hearing aid maximum output to UCL. It was found that a hearing aid often gives about 5 dB, and sometimes 10 dB, higher RE/SPLs than the earphone, if the hearing aid output levels, as measured in a 2-cc coupler (IEC1261, are equal to the earphone output levels as measured in a 6-cc coupler (NBSSA). It is recommended that a safety margin of at least 5 dB be used in the preliminary fitting when matching hearing aid SSPL90to the patient's UCL, converted to dB SPL.

ISSN:0196-0202    

出版商:OVID    

年代:1983

数据来源: OVID

摘要:

The rated quality and intelligibility of speech processed by hearing aids in which the low-frequency output had been reduced by either electronic modification (low-cut tone controls) or acoustic modification (vented or open earmolds) was investigated. Fifteen subjects with high-frequency hearing loss provided data for nine commercial hearing aids and both high and low background noise levels. Results for both background noise levels indicated that for hearing aids with a low-frequency cut off at or above 750 Hz (as measured in this investigation), the use of a vented or open earmold significantly improved both quality and intelligibility even when it had essentially no effect on the hearing aid's low-frequency output. The implication of the outcome is that for an individual with essentially normal low-frequency sensitivity and a high-frequency hearing loss, an earmold incorporating an opening should be used whenever possible, even though it may not be used for the purpose of controlling low-frequency amplification.

ISSN:0196-0202    

出版商:OVID    

年代:1983

数据来源: OVID

摘要:

Ten voluntary subjects were exposed to 10 min of recorded pop music on five occasions. On five other occasions these subjects were exposed to a noise with level-, frequency-, and time-distribution characteristics, measured in octave-band steps, equal to those of the music. Measurements of temporary threshold shift showed almost equal sensitivity to the two stimuli in four subjects, whereas six others demonstrated marked differences in sensitivity. Differences were always due to more temporary threshold shift after exposure to the nonmusical noise stimulus. These findings imply that factors other than physical properties of the fatiguing sound contribute to the degree of temporary threshold shift.

ISSN:0196-0202    

出版商:OVID    

年代:1983

数据来源: OVID

摘要:

A measurement of noise exposure levels of players of electronic games was made in two small arcades using a noise dosimeter. Two different measurements were made, at normal operating levels and maximum possible levels. The results showed that excessive exposure levels were possible on arcade games and that these levels were mainly the result of certain procedures performed by the arcade operators. It was recommended that these procedures be avoided by operators to reduce the risk of noise-induced hearing loss of their patrons.

ISSN:0196-0202    

出版商:OVID    

年代:1983

数据来源: OVID

摘要:

The relationship between language abilities and dynamic range was studied in two groups of significantly deaf adolescents. One group (N = 21) attended a school for the deaf, and the other (N= 23) consisted of either students in regular schools or those attending units for the deaf within regular schools. Two measures of dynamic range were obtained, and language ability was defined by performance on a syntactic abilities test. Acoustic reflexes were also obtained and the relationship to language abilities was determined. Dynamic range was observed to be a highly significant predictor of language score within the deaf school group, but did not relate to language score within the regular school group. Presence or absence of the acoustic reflex bore no apparent relationship to language ability.

ISSN:0196-0202    

出版商:OVID    

年代:1983

数据来源: OVID

摘要:

It was the objective of this preliminary investigation to determine whether psychoacoustic tuning curves could be obtained on naive listeners utilizing a sweep, frequency-modulated masker. Psychoacoustic tuning curves were obtained on 10 normal-hearing young adult listeners. A simultaneous masking paradigm was utilized. The probe tone was a 2 kHz signal and the masker was a sweep, frequency-modulated tone between and including 750 Hz and 4 kHz. A mean Q value of 4.93 with a standard deviation of 0.85 was obtained from the subjects. Clinical implications and needs for further research are discussed.

ISSN:0196-0202    

出版商:OVID    

年代:1983

数据来源: OVID

摘要:

The purpose of this study was to compare the sensitivity of the ABR wave V latency-intensity (L-1) function to that of Alternate Binaural Loudness Balance, Loudness Discomfort Level, and Acoustic Reflex Threshold tests in identifying sensory hearing losses. Five audiometric groups were tested by each procedure. The groups included subjects with normal hearing, and with conductive, high-frequency sensory, flat sensory, and retrocochlear hearing losses. The ability of each test to separate sensory from retrocochlear impairments was investigated. A positive discriminator for cochlear impairments was of particular interest. A combination of wave V L-l slope at lower intensities and the dB HL value that separates steep and shallow slopes of the L-l function appears to meet this objective.

ISSN:0196-0202    

出版商:OVID    

年代:1983

数据来源: OVID