Some Effects of Bone-Conducted Masking

1965 ◽  
Vol 8 (3) ◽  
pp. 253-261
Author(s):  
Zahrl G. Schoeny ◽  
Cornelius P. Goetzinger ◽  
Albert W. Knox
Keyword(s):  
Hearing Loss ◽  
Narrow Band ◽  
Bone Conduction ◽  
Wide Band ◽  
Tone Presentation ◽  
Narrow Band Noise ◽  
Band Noise ◽  
Continuous Tone ◽  
The Difference ◽  
Wide Band Noise

Twenty subjects with normal hearing and 20 subjects with sensori-neural hearing loss were examined relative to the effects of wide- and narrow-band white noise delivered by bone conduction at the forehead; differences between thresholds with interrupted- and continuous-tone presentation under the conditions of quiet, wide-band noise, narrow-band noise; the difference between threshold shifts at 1 000 and 2 000 cps when the SAL masking technique is used; and differences between SAL and conventional bone-conduction thresholds at 1 000 or 2 000 cps. Narrow-band noise produced less shift than wide-band noise under all conditions Differences between interrupted- and continuous-tone presentation yielded better thresholds. Shifts at 1 000 cps and 2 000 cps were significantly different, with the shift at 1 000 cps being greater.

Comparative Bekesy Typing with Broad and Modulated Narrow-Band Noise

1969 ◽  
Vol 12 (4) ◽  
pp. 840-846
Author(s):  
Charles T. Grimes ◽  
Alan S. Feldman
Keyword(s):  
White Noise ◽  
Narrow Band ◽  
Band Width ◽  
Masking Effect ◽  
Type Ii ◽  
Noise Masking ◽  
Narrow Band Noise ◽  
Band Noise ◽  
Continuous Tone ◽  
Békésy Audiometry

This study explored the effectiveness of modulated narrow-band noise as a masking source for sweep-frequency Bekesy audiometry. Five sophisticated normal-hearing subjects traced Bekesy audiometry thresholds for pulsed and continuous tone with no masking and under three conditions of contralateral masking: (1) white noise, (2) modulated narrow-band noise with a constant band-width of ±150 Hz, and (3) modulated narrow-band noise with a band-width of ±300 Hz. Results indicated that the continuous tone tracing obtained under the second condition separated from the pulsed tracing supportive of a Type II tracing. With the third condition, pulsed-continuous differences were somewhat smaller. Under the first condition, the difference between pulsed and continuous tracings was not apparent. When two unsophisticated subjects were tested with the modified band-width noise, results indicated extreme variation between pulsed and continuous tracings. We concluded that the masking effect of a constant band-width modulated narrow-band noise is about the same as that of white noise for a pulsed tone tracing. However, the use of a modulated narrow-band noise masking source may cause false Type II Bekesy audiograms due to the greater masking effect on a continuous tone threshold.

Temporary Threshold Shift Reduction as a Function of Contralateral Noise Level

1972 ◽  
Vol 15 (4) ◽  
pp. 792-799 ◽  
Author(s):  
Raymond S. Karlovich ◽  
Barry F. Luterman ◽  
Mary H. Abbs
Keyword(s):  
Wide Band ◽  
Acoustic Stimulation ◽  
Noise Levels ◽  
Contralateral Noise ◽  
Stapedius Muscle ◽  
Band Noise ◽  
Continuous Tone ◽  
Males And Females ◽  
Contralateral Ear ◽  
Wide Band Noise

Seven male and seven female subjects were exposed to a monaurally presented 1000-Hz continuous tone at 110 dB SPL for three minutes. During the exposure pulsed wide-band noise (one second on / one second off) was presented to the contralateral ear. Six noise levels (70, 80, 90, 100, 110, and 115 dB SPL) were used. In addition, a control condition consisting of the absence of contralateral stimulation was used. Pre- and postexposure thresholds were tracked with a Bekesy type procedure for a stimulus one-half octave above the exposure frequency. TTS was greatest for the control condition (no contralateral noise) and became progressively less as the SPL of contralateral noise was increased from 70 to 115 dB. The inverse relation between magnitude of TTS and the level of contralateral noise was attributed to stapedius muscle activity. Hence, the data provided psychophysical support for the contention that the stapedius muscle reflex is graded in response to the level of acoustic stimulation. The data also indicated an absence of significant differences in TTS magnitudes between males and females.

scholarly journals Hydrogen-Saturated Saline Protects Intensive Narrow Band Noise-Induced Hearing Loss in Guinea Pigs through an Antioxidant Effect

PLoS ONE ◽  
2014 ◽  
Vol 9 (6) ◽  
pp. e100774 ◽  
Author(s):  
Liwei Chen ◽  
Ning Yu ◽  
Yan Lu ◽  
Longjun Wu ◽  
Daishi Chen ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Guinea Pigs ◽  
Narrow Band ◽  
Antioxidant Effect ◽  
Noise Induced Hearing Loss ◽  
Narrow Band Noise ◽  
Band Noise

scholarly journals Susceptibility to Residual Inhibition Is Associated With Hearing Loss and Tinnitus Chronicity

2021 ◽  
Vol 25 ◽  
pp. 233121652098630
Author(s):  
S. Hu ◽  
L. Anschuetz ◽  
D. A. Hall ◽  
M. Caversaccio ◽  
W. Wimmer
Keyword(s):  
Hearing Loss ◽  
Narrow Band ◽  
Acoustic Stimulation ◽  
Normal Hearing ◽  
Short Term ◽  
Factors Associated ◽  
Band Noise ◽  
Comparator Group ◽  
Residual Inhibition ◽  
Subject Comparison

Residual inhibition, that is, the temporary suppression of tinnitus loudness after acoustic stimulation, is a frequently observed phenomenon that may have prognostic value for clinical applications. However, it is unclear in which subjects residual inhibition is more likely and how stable the effect of inhibition is over multiple repetitions. The primary aim of this work was to evaluate the effect of hearing loss and tinnitus chronicity on residual inhibition susceptibility. The secondary aim was to investigate the short-term repeatability of residual inhibition. Residual inhibition was assessed in 74 tinnitus subjects with 60-second narrow-band noise stimuli in 10 consecutive trials. The subjects were assigned to groups according to their depth of suppression (substantial residual inhibition vs. comparator group). In addition, a categorization in normal hearing and hearing loss groups, related to the degree of hearing loss at the frequency corresponding to the tinnitus pitch, was made. Logistic regression was used to identify factors associated with susceptibility to residual inhibition. Repeatability of residual inhibition was assessed using mixed-effects ordinal regression including poststimulus time and repetitions as factors. Tinnitus chronicity was not associated with residual inhibition for subjects with hearing loss, while a statistically significant negative association between tinnitus chronicity and residual inhibition susceptibility was observed in normal hearing subjects (odds ratio: 0.63; p = .0076). Moreover, repeated states of suppression can be stably induced, reinforcing the use of residual inhibition for within-subject comparison studies.

scholarly journals Target detection against narrow band noise backgrounds

1999 ◽  
Vol 39 (13) ◽  
pp. 2191-2203 ◽  
Author(s):  
Mark W. Cannon ◽  
Greg J. Reese ◽  
Steven C. Fullenkamp
Keyword(s):  
Target Detection ◽  
Narrow Band ◽  
Narrow Band Noise ◽  
Band Noise

Search for narrow-band-noise modulations of the infrared transmission of blue bronze

2002 ◽  
Vol 12 (9) ◽  
pp. 85-86
Author(s):  
R. C. Rai ◽  
V. A. Bondarenko ◽  
J. W. Brill
Keyword(s):  
Absorption Coefficient ◽  
Narrow Band ◽  
Diode Lasers ◽  
Infrared Transmission ◽  
Narrow Band Noise ◽  
Band Noise ◽  
Tunable Diode Lasers ◽  
Upper Limits ◽  
Blue Bronze

We have searched for narrow-band-noise (NBN) modulations of the infrared transmission in blue bronze, using tunable diode lasers. No modulations were observed, giving an upper limits for NBN changes in the absorption coefficient of $\Delta \alpha_{NBN} < 0.3 $ / cm ($\approx \alpha/2000$). The implication of these results on proposed CDW properties and NBN mechanisms are discussed.

Lateralization of Narrow-Band Noise by Blind and Sighted Listeners

Perception ◽  
10.1068/p3338 ◽  
2002 ◽  
Vol 31 (7) ◽  
pp. 855-873 ◽  
Author(s):  
Helen J Simon ◽  
Pierre L Divenyi ◽  
Al Lotze
Keyword(s):  
Narrow Band ◽  
Lateral Displacement ◽  
Spatial Hearing ◽  
Binaural Hearing ◽  
Center Frequency ◽  
Intensity Difference ◽  
Sensation Level ◽  
Individual Subject ◽  
Narrow Band Noise ◽  
Band Noise

The effects of varying interaural time delay (ITD) and interaural intensity difference (IID) were measured in normal-hearing sighted and congenitally blind subjects as a function of eleven frequencies and at sound pressure levels of 70 and 90 dB, and at a sensation level of 25 dB (sensation level refers to the pressure level of the sound above its threshold for the individual subject). Using an ‘acoustic’ pointing paradigm, the subject varied the IID of a 500 Hz narrow-band (100 Hz) noise (the ‘pointer’) to coincide with the apparent lateral position of a ‘target’ ITD stimulus. ITDs of 0, ±200, and ±400 μs were obtained through total waveform delays of narrow-band noise, including envelope and fine structure. For both groups, the results of this experiment confirm the traditional view of binaural hearing for like stimuli: non-zero ITDs produce little perceived lateral displacement away from 0 IID at frequencies above 1250 Hz. To the extent that greater magnitude of lateralization for a given ITD, presentation level, and center frequency can be equated with superior localization abilities, blind listeners appear at least comparable and even somewhat better than sighted subjects, especially when attending to signals in the periphery. The present findings suggest that blind listeners are fully able to utilize the cues for spatial hearing, and that vision is not a mandatory prerequisite for the calibration of human spatial hearing.

Sign in / Sign up

Export Citation Format

Share Document