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At least 523 records · Page 29Linked to original sources
PubMed1990

Administering audiometric speech tests via bone conduction: a comparison of transducers.

This study compared the intelligibility of speech delivered via three transducers: a TDH-39 earphone, a Pracitronic KH 70 bone vibrator, and a Radioear B-72 bone vibrator. CID W-1 spondees were presented to normal-hearing listeners via each transducer over a range of intensity levels. Functions relating the percentage of spondees correctly identified to stimulus level were similar for the three transducers, and notably, their slopes were comparable. This suggests that it is appropriate to use the W-1 word lists to determine speech reception thresholds (SRTs) with the KH 70 and B-72 bone vibrators, even though these word lists were originally developed for testing by air conduction. Our subjects also identified NU-6 monosyllabic words equally well for each transducer when the words were delivered at 40 dB above SRT. This result suggests that it is also valid to deliver the NU 6 speech test via the two types of bone vibrators.

Adolescent↗
PubMed1981

[The registration of brain stem evoked responses and middle latency with air and bone conduction stimuli in the evaluation of hearing disorders (author's transl)].

The theory and practice to record the brain stem response and middle latency have been described. Normative data and sources of error have been presented. The early evoked potentials are a powerful tool, to determine the degree of hearing loss in infants and to detect possible brain stem lesions. This exact diagnosis is an assumption for a successful rehabilitation.

Acoustic Impedance Tests↗
PubMed1987

Fabrication of a new headset for air- and bone-conduction audiometry.

The construction of a new audiometric headset which supports both ac and bc transducers is described. The bc transducer can be adjusted from 0-1500 g force. Future development should be directed toward (1) determining if such a headset is adjustable and stable on different size heads, (2) determining the test-retest reliability of the force measuring system, (3) reshaping the headset to make it smaller and more comfortable, and (4) consolidating the power/amplifier supply into a single unit.

Air↗
PubMed1980

An evaluation of speech audiometry by bone conduction in hearing-impaired adults.

Pure-tone thresholds, speech reception thresholds (SRT), and speech discrimination scores (DS) were obtained by ac and bc on 20 normal-hearing and 30 hearing-impaired adults. Correlations between the SRT and pure-tone thresholds (ave. of .5, 1, and 2 kc/s) were significant by both ac and bc. Correlations between DS by ac and bc were also highly significant, indicating the value of the bc DS in specific difficult cases. The clinical observation was confirmed statistically of decreasing DS with increasing sensorineural hearing loss.

Adolescent↗
PubMed1982

Bone conduction hearing in turtles.

Audiofrequencies were delivered to specimens of 3 turtle families by ac and bc in an attempt to elicit a behavioral response. Aerial signals with intensities up to 100 db SPL failed to elicit any consistent response. The same signals delivered directly to the carapace resulted in brisk head withdrawals. There was little energy loss measured along the shell suggesting it may serve in a minor role as an acoustic receptor. Turtles could use bc hearing in short distance detection even when withdrawn into the shell. Although the ear is likely mediating the head reflex, somatic mechanoreceptors cannot be completely excluded.

Acoustic Stimulation↗
PubMed1989

Jaw movement and bone-conduction in normal listeners and a unilateral hemi-mandibulectomee.

Relative movement between the mandible and skull may compress the auditory meatus and produce an excess sound in the ear canal. To test this, measurements of sound pressure in the ear canal, and movement of the upper and lower jaw are reported on normal subjects and a unilateral hemi-mandibulectomee. On the side the unilateral hemi-mandibulectomee has a jaw and in the subjects with normal jaws, the data confirm that mandible-movement relative to the skull produces sound in the ear canal. The excess sound in the ear canal when the jaw is free to move independently of the skull can be predicted from the relative movement between them.

Bone Conduction↗
PubMed1981

Bone-conducted speech: intelligibility functions and threshold force levels for spondees.

Threshold force values for spondees were obtained for thirty-six subjects with normal hearing using the Radioear B-70-AA and B-71 bone vibrators, which were coupled to the head with a Radioear P-3333 headband. Measurements were made on a Bruel & Kjaer model 4930 artificial mastoid. In addition to the 1000 Hz calibration tone preceding the spondees, speech noise and white noise were dubbed on the tape at the same level as the tone. Since the results indicated similar threshold force levels for both vibrators, the data from the B-70-AA and B-71 were pooled. These values in dB re 1 micro Newton are 53.2 dB for 1000 Hz, 56.8 dB with white noise, and 62.4 dB using speech noise. Any of these three calibrating signals appear appropriate when delivering speech to the B-70-AA or B-71 bone vibrators. Another purpose of this study was to establish normal speech intelligibility functions for the CID W-22 test using the B-71 vibrator. Sixteen subjects with normal hearing were tested at sensation levels (SLs) ranging from 0 to 34 dB. The results showed that intelligibility scores ranged from about 15 percent at 0 dB SL to 95 percent at 34 dB SL, and that the slope of the intelligibility function systematically decreased with increasing intensity. These findings are typical of speech intelligibility functions obtained via air conduction.

Adult↗