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Results for “Bone Conduction”

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PubMed1983

Marine turtle reception of bone-conducted sound.

An individual each of the marine turtles, Caretta caretta and Lepidochelys kempi, were stimulated with audiofrequencies delivered directly to the skull. Startle responses were observed to underwater stimuli of .25 and .5 kc/s. Neural responses to underwater bone-conducted (bc) sound were recorded in another aquatic form, the snapping turtle, Chelydridae serpentina. The morphology of the neural response suggested the involvement of the auditory system in bc responsivity. Bc hearing appears to be a reception mechanism for marine turtles with the skull and shell acting as receiving surfaces. Turtles are capable of receiving the low-frequency spectrum of the natal beach, which may serve as one of the cues in nesting returns.

Animals↗

PubMedDate not supplied

Occlusion effect in bone conduction pure tone and speech audiometry.

Two experiments were conducted to determine the occlusion effect (OE) for pure tone and spondee stimuli. Results of experiment I using mastoid placement and unilateral occlusion yielded a mean OE for bone conduction speech reception thresholds of 4.67 dB, which was in agreement with the average OEs of 0.50, 1.0 and 2.0 kHz, or simply the same as the OE for 1.0 kHz. However, the magnitude of the observed OEs for test frequencies of 0.25 to 4.0 kHz was considerably less than the OEs reported in previous investigations. In an attempt to explain this discrepancy, experiment II used unilateral and bilateral occlusion with mastoid and forehead placement for pure tone stimuli. Significant differences (p less than 0.05) were found between OEs obtained with mastoid versus forehead placement and for unilateral versus bilateral occlusion.

Adult↗

PubMedDate not supplied

[Bone conduction in hearing disorders due to defective sound conduction with special reference to eustachian salpingitis].

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Bone Conduction↗

PubMed1980

Auditory brainstem response. Sensory assessment by bone conduction masking.

Auditory brainstem response (ABR) thresholds to clicks were determined for 15 normal hearing adults and for four patients with conductive, sensorineural, or mixed hearing losses. Conductive losses were created in five of the normal hearing adult subjects for which threshold assessment was repeated. The response to a click at 5 dB above threshold was masked with a high-pass, bone-conducted noise. For both the patients and the normal subjects, subtracting 15 dB from the amount of noise required to mask this ABR response approximated sensory threshold. Tympanometry was performed on all patients, except one exhibiting unilateral congenital atresia, to confirm middle ear status.

Acoustic Impedance Tests↗

PubMed1965