Bone-conducted Speech Research Articles

Occlusion effect: bone conduction speech audiometry using forehead and mastoid placement.

The occlusion effect (OE) was determined for bone conduction speech reception thresholds (SRTs) in 24 normally hearing subjects using forehead and mastoid placement. Results indicated that the OE was about 3 dB greater using forehead as opposed to mastoid placement. The intersubject variability of the OE is similar for the forehead and mastoid positions. The formula for effective masking for bone conduction speech should be equal to the minimum masking level for bone conduction speech plus the air-bone gap of the nontest ear plus 18 dB to account for the OE when using mastoid placement.

Bone-Conducted Speech Reception ThresholdAn Investigation with the Oticon a 20 Bone Vibrator Calibrated on the Brüel & Kjær Artificial Mastoid

This study proposes a new clinical parameter, the bone—conducted speech reception threshold, and hypothesises its correlation with other clinical variables, viz. the three frequency pure—tone averages of air—and bone—conducted thresholds, and the air—conducted speech reception threshold. Three groups of population were studied: (1) Normal—hearing group, (2) Conductive hearing loss group, and (3) Sensorineural hearing loss group. The audiometer was calibrated to ISO standards for air conduction and to B.S. draft proposal values for bone conduction. The Oticon A 20 bone vibrator was used (conforming to IEC R 373, 1971), calibrated on a Brüel & Kjær artificial mastoid 4930 (conforming to IEC R 373, 1971 and B. C. 4009: 1966). The study confirms the reproducibility of the British Standard for bone conduction threshold and proves the utility of the Brüel & Kjær artificial mastoid as well as of the Oticon bone vibrator. The results indicate significant correlations between the bone—conducted speech reception threshold and the other variables studied, thus supporting the hypothesis. The clinically useful construct of “Air—bone gap for speech”, is evolved. In both pathological groups, a significant correlation between the air—bone gap for speech and the air—bone gap for pure—tone averages was found. However, some patients exhibited a considerably (up to 25 dB) larger air—bone gap for verbal than for tonal stimuli. This was particularly found in cases with sloping bone conduction curves. Larger populations will be studied.

Bone-Conducted Speech Reception ThresholdAn Investigation with the Oticon a 20 Bone Vibrator Calibrated on the Brüel & Kjær Artificial Mastoid

Bone-Conducted Speech Reception Threshold<i>An Investigation with the Oticon a 20 Bone Vibrator Calibrated on the Brüel &amp; Kjær Artificial Mastoid</i>

Bone conduction speech audiometry. A calibrated method to predict post-stapedectomy discrimination scores.

Bone conduction speech audiometry. A calibrated method to predict post-stapedectomy discrimination scores.

Using masked bone-conducted speech as an aid in the detection of functional unilateral hearing losses in children

A group of ten subjects with known unilateral hearing losses and a group of ten subjects with uncertain unilateral losses were presented spondee words at each subjects' bone-conducted speech-reception threshold ( BC-SRT) and write noise masking signal presented monaurally and binaurally through earphones. The masking level (dB) which interferes with the speech threshold has significance in determining the true sensitivity of each ear. The binaural masking interference level ( BMIL) is the masking intensity which interferes with the speech sensitivity of the good ear(s) while the monaural masking interference level for the ‘poor’ ear ( MMIL-‘poor’ ear) refers to the intensity interfering with the speech sensitivity of that ear. The monaural masking interference level for the good ear ( MMIL-good ear) is that intensity level interfering with its speech sensitivity. The relationships between these measures can be interpreted as positive or negative in the detection of a functional loss. The ten known unilateral losses were found to be negative while seven of the uncertain losses were positive. The remaining three were negative.

THE USE OF MASKED BONE-CONDUCTED SPEECH AS AN AID IN THE DETECTION OF FEIGNED UNILATERAL HEARING LOSSES.

THE USE OF MASKED BONE-CONDUCTED SPEECH AS AN AID IN THE DETECTION OF FEIGNED UNILATERAL HEARING LOSSES.

Bone Conduction Speech Audiometry

Bone Conduction Speech Audiometry