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Biomedical subjects

P L Michael

Publications and source records attributed to P L Michael.

8 recordsLinked to original sources
PubMed1977

Loudness Discrimination Index (LDI): a test for the early detection of noise susceptible individuals.

Work has been completed at the Environmental Acoustics Laboratory during the past year on developing an industrially feasible Loudness Discrimination Index (LDI) Test. Data obtained on experimental subjects who had been exposed to brief, high-level sound showed that the maximum Loudness Discrimination Index Shift (LDIS-Max.) is a valid and reliable indicator of temporary, noise-induced, hearing change. This test is better suited to industrial usage than the traditional TTS test. Suggestions for the implementation of LDI testing in the industrial setting are discussed.

Auditory Threshold↗
PubMed1976

A procedure for the early detection of noise-susceptible individuals.

Currently used threshold audiograms fail to detect the early stages of noise-induced hearing impairment. Threshold shifts may reach 10 to 15 dB before the impairment is detected. Loudness difference limen and critical band phenomena should provide an earlier and more sensitive test for such hearing impairment.

Auditory Perception↗
PubMed1976

The effect of high level sound exposure on the loudness difference limen.

Currently used threshold audiograms fail to detect the early stages of noise-induced hearing impairment. Threshold shifts may reach 10 to 15 dB before the impairment is detected. Loudness difference limen and critical band phenomena may provide an earlier and more sensitive test for such hearing impairment. Data is reported which shows that the difference limen shift (DLS) due to noise persists longer than temporary threshold shift (TTS). These findings suggest that DLS may be a more feasible tool for industrial use than either TTS or monitoring audiometry.

Auditory Perception↗
PubMedDate not supplied

The AudioScope: a clinical tool for otoscopic and audiometric examination.

The AudioScope was evaluated both in laboratory and in clinical settings. Audiometric calibration of the instrument proved to be reliable and easy to accomplish. Clinic evaluation with 182 subjects demonstrated that audiometric screening with the AudioScope shows good agreement with conventional, clinical audiometry. The instrument is a useful clinical adjunct to audiometry since it generally categorizes audiogram configuration and level and provides insight into subject cooperation. This information can enhance the efficiency of manual, threshold audiometry, especially in pediatric cases.

Adolescent↗
PubMedDate not supplied

Noise attenuation characteristics of the MX-41/AR and the Telephonics circumaural audiometric headsets.

Masking from background noise is often a serious problem when hearing levels are measured at or near the low reference threshold levels specified in the American National Standards Specifications for Audiometers, ANSI S3.6-1969. Since background noise limits for audiometric test rooms are inversely related to the noise reduction characteristics of the earphone/cushion assemblies, it is important that these units have significant and consistent attenuation properties. This paper reports the noise reduction characteristics measured for the conventional TDH-39 earphone mounted in the supra-aural MX-41/AR cushion and for the new TDH-50 Telephonics circumaural headset. The circumaural headset was found to produce an average of about 10 dB more noise attenuation than did a well-adjusted supra-aural device, and the circumaural headset provided much more consistent test-retest noise reduction characteristics. Theoretical aspects of headband force as well as the implications of attenuation measurements for test room recommendations are discussed.

Adult↗