Modulation Detection by Patients with Eighth-Nerve Tumors

1986 ◽  
Vol 29 (3) ◽  
pp. 413-419 ◽  
Author(s):  
C. Formby
Keyword(s):  
Hearing Loss ◽  
High Frequency ◽  
Modulation Frequency ◽  
Broad Band ◽  
Cutoff Frequency ◽  
Threshold Function ◽  
Filter Model ◽  
Eighth Nerve ◽  
Nerve Tumor ◽  
Method Of Adjustment

Detection thresholds for sinusoidally amplitude-modulated broad-band noise were measured as a function of modulation frequency for 4 normally hearing listeners and for 6 patients suffering eighth-nerve tumors. Measurements were obtained using a method-of-adjustment (MOA) procedure. On average, the threshold values revealed that more modulation was needed across all modulation frequencies for the patients' affected ears relative to either the normally hearing listeners or the patients' better ears. The cutoff frequency derived from the average modulation-threshold function (MTF) for the affected ears was about half the normal value. For a simple lowpass-filter model of the process, the latter result suggested a doubling of the auditory time constant in the affected ears. These patients, on average, exhibited the characteristic high-frequency audiometric hearing loss most often associated with eighth-nerve tumors. Their MTFs closely resembled MTFs described previously for high-frequency and simulated high-frequency audiometric hearing loss. The results of statistical analyses suggested that high-frequency audiometric hearing loss, irrespective of other influences, is the most parsimonious explanation for the increased modulation thresholds measured for the eighth-nerve tumor patients.

ABR Indices

1996 ◽  
Vol 5 (1) ◽  
pp. 97-104 ◽  
Author(s):  
Christopher D. Bauch ◽  
Wayne O. Olsen ◽  
Angela F. Pool
Keyword(s):  
Hearing Loss ◽  
Tumor Size ◽  
High Frequency ◽  
Specific Criterion ◽  
High Frequency Hearing Loss ◽  
Eighth Nerve ◽  
Sensitive Index ◽  
Nerve Tumor ◽  
Interpeak Interval

ABR absolute latencies and interpeak intervals were reviewed for 684 non-tumor ears and 75 eighth-nerve tumor ears having various degrees of high frequency hearing loss. For non-tumor ears, the percentage of abnormal absolute latencies for waves I, III, and V increased rather systematically as hearing loss increased, whereas absolute latencies for eighth-nerve tumor ears were largely abnormal regardless of hearing loss. Interpeak intervals were normal for most of the non-tumor ears, but the I–III and I–V intervals were abnormal for most of the tumor ears. The most sensitive index for otoneurologic assessment was a combination of abnormal wave V interaural latency differences or I–V interpeak interval, and the most specific criterion was the I–V interpeak interval. Tumor size influenced sensitivity of most ABR indices.

Diplacusis Associated with Bilateral High Frequency Hearing Loss

1975 ◽  
Vol 18 (1) ◽  
pp. 5-16 ◽  
Author(s):  
Dale O. Robinson ◽  
John H. Gaeth
Keyword(s):  
Hearing Loss ◽  
Hard Of Hearing ◽  
High Frequency ◽  
Traditional Method ◽  
Constant Error ◽  
Normal Hearing ◽  
Psychophysical Method ◽  
High Frequency Hearing Loss ◽  
Standard Tone ◽  
Method Of Adjustment

Seven normal-hearing subjects and seven subjects with mild bilateral high-frequency sensorineural hearing losses were studied to explore the presence of diplacusis. A tracking procedure of psychophysical method of adjustment-limits was used for pitch judgments rather than the traditional method of adjustment. Each subject was presented with a standard 4000-Hz tone for 500 msec and alternately a variable tone for 500 msec. Subjects were instructed to adjust the variable tone upward or downward in pitch to bracket the pitch sensation of the standard tone. Two intra-aural and two interaural listening conditions were studied. A graphic representation of the subjects' adjustments of the variable tone was obtained for each condition. The resulting tracing indicated frequency correlates to the pitch adjustments from which excursion width and constant error were calculated. Some hard-of-hearing subjects and one normal-hearing subject were found to have diplacusis. Subjects with hearing losses exhibited larger excursion widths for intra- and interaural listening conditions. Subjects with hearing losses tended to be less consistent in pitch judgments than normal-hearing subjects. These findings were interpreted to mean that bilaterally symmetrical hearing losses increase the incidence of pitch aberrations.

Interactive Effects of High-Pass Filtering and Masking Noise on Word Recognition

2005 ◽  
Vol 114 (11) ◽  
pp. 867-878 ◽  
Author(s):  
Saravanan Elangovan ◽  
Andrew Stuart
Keyword(s):  
Hearing Loss ◽  
Word Recognition ◽  
Hearing Impairment ◽  
High Frequency ◽  
Cutoff Frequency ◽  
Low Frequency ◽  
Interactive Effects ◽  
Signal To Noise ◽  
Noise Condition ◽  
High Pass

Objectives: This study sought to examine the word recognition performance in noise of individuals with a simulated low-frequency hearing loss. The goal was to understand how low-frequency hearing impairment affects performance on tasks that challenge temporal processing skills. Methods: Twenty-two normal-hearing young adults participated. Monosyllabic words were presented in continuous and interrupted noise at 3 signal-to-noise ratios of −10, 0, and +10 dB. High-pass filtering of the stimuli at 3 different cutoff frequencies (ie, 1,000, 1,250, and 1,500 Hz) simulated the low-frequency hearing impairment. Results: In general, performance decreased with increasing cutoff frequency, was higher for more favorable signal-to-noise ratios, and was superior in the interrupted condition relative to the continuous noise condition. One important revelation was that the magnitude of the performance superiority observed in the interrupted noise condition did not diminish with high-pass filtering; ie, the release from masking in interrupted noise was preserved. Conclusions: The results of the present study complement previous findings in which this paradigm was used with low-pass filtering to simulate a high-frequency hearing loss. That is to say, low-frequency hearing channels are inherently poorer than high-frequency channels in temporal resolution.

The Temporal Course of the Masking of Tinnitus as a Basis for Inferring Its Origin

1981 ◽  
Vol 24 (2) ◽  
pp. 257-261 ◽  
Author(s):  
M. J. Penner ◽  
Steven Brauth ◽  
Linda Hood
Keyword(s):  
Hearing Loss ◽  
Sensorineural Hearing Loss ◽  
Neural Activity ◽  
Broad Band ◽  
Sensorineural Hearing ◽  
Eighth Nerve ◽  
Band Noise ◽  
Minute Period ◽  
Temporal Course

For patients with tinnitus and sensorineural hearing loss, the intensity of broad-band noise required to mask the tinnitus increases by as much as 45 dB during a 30-minute period if the patient is exposed to noise. In contrast, the intensity required to mask an external tone remains nearly constant. Some speculations which might account for this result are offered. Excess neural activity is posited to be the physiological determinant of tinnitus and to be central, generated in the brainstem postsynaptic to the, eighth nerve.

scholarly journals Extended high-frequency hearing enhances speech perception in noise

2019 ◽  
Vol 116 (47) ◽  
pp. 23753-23759 ◽  
Author(s):  
Lina Motlagh Zadeh ◽  
Noah H. Silbert ◽  
Katherine Sternasty ◽  
De Wet Swanepoel ◽  
Lisa L. Hunter ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Speech Perception ◽  
High Frequency ◽  
Speech Intelligibility ◽  
Cutoff Frequency ◽  
Broadband Noise ◽  
Self Report ◽  
Speech Perception In Noise ◽  
High Frequencies ◽  
Speech In Noise

Young healthy adults can hear tones up to at least 20 kHz. However, clinical audiometry, by which hearing loss is diagnosed, is limited at high frequencies to 8 kHz. Evidence suggests there is salient information at extended high frequencies (EHFs; 8 to 20 kHz) that may influence speech intelligibility, but whether that information is used in challenging listening conditions remains unknown. Difficulty understanding speech in noisy environments is the most common concern people have about their hearing and usually the first sign of age-related hearing loss. Digits-in-noise (DIN), a widely used test of speech-in-noise perception, can be sensitized for detection of high-frequency hearing loss by low-pass filtering the broadband masking noise. Here, we used standard and EHF audiometry, self-report, and successively higher cutoff frequency filters (2 to 8 kHz) in a DIN test to investigate contributions of higher-frequency hearing to speech-in-noise perception. Three surprising results were found. First, 74 of 116 “normally hearing,” mostly younger adults had some hearing loss at frequencies above 8 kHz. Early EHF hearing loss may thus be an easily measured, preventive warning to protect hearing. Second, EHF hearing loss correlated with self-reported difficulty hearing in noise. Finally, even with the broadest filtered noise (≤8 kHz), DIN hearing thresholds were significantly better (P < 0.0001) than those using broadband noise. Sound energy above 8 kHz thus contributes to speech perception in noise. People with “normal hearing” frequently report difficulty hearing in challenging environments. Our results suggest that one contribution to this difficulty is EHF hearing loss.

Modified Earpieces and CROS for High Frequency Hearing Losses

1968 ◽  
Vol 11 (1) ◽  
pp. 204-218 ◽  
Author(s):  
Elizabeth Dodds ◽  
Earl Harford
Keyword(s):  
Hearing Loss ◽  
Hearing Aids ◽  
High Frequency ◽  
Hearing Aid ◽  
Sound Field ◽  
Intensity Level ◽  
Test Results ◽  
High Frequency Hearing Loss ◽  
Increased Sensitivity ◽  
Difficult Cases

Persons with a high frequency hearing loss are difficult cases for whom to find suitable amplification. We have experienced some success with this problem in our Hearing Clinics using a specially designed earmold with a hearing aid. Thirty-five cases with high frequency hearing losses were selected from our clinical files for analysis of test results using standard, vented, and open earpieces. A statistical analysis of test results revealed that PB scores in sound field, using an average conversational intensity level (70 dB SPL), were enhanced when utilizing any one of the three earmolds. This result was due undoubtedly to increased sensitivity provided by the hearing aid. Only the open earmold used with a CROS hearing aid resulted in a significant improvement in discrimination when compared with the group’s unaided PB score under earphones or when comparing inter-earmold scores. These findings suggest that the inclusion of the open earmold with a CROS aid in the audiologist’s armamentarium should increase his flexibility in selecting hearing aids for persons with a high frequency hearing loss.

scholarly journals Evaluating the Effectiveness of Earplugs in Preventing Noise-Induced Hearing Loss in an Auto Parts Factory in China

2021 ◽  
Vol 18 (13) ◽  
pp. 7190
Author(s):  
Wei Gong ◽  
Liangliang Zhao ◽  
Ling Li ◽  
Thais C. Morata ◽  
Wei Qiu ◽  
...  
Keyword(s):  
Hearing Loss ◽  
High Frequency ◽  
Health And Safety ◽  
Health Department ◽  
Detectable Effect ◽  
High Frequency Hearing Loss ◽  
Mandatory Requirement ◽  
Exposed Workers ◽  
Fit Testing ◽  
Auto Parts

A survey was administered to 385 noise-exposed workers from an auto parts factory and 1268 non-noise-exposed health department employees in China. Individual 8 h A-weighted equivalent sound levels (LAeq,8h), earplug personal attenuation ratings (PARs), and pure-tone audiometric tests were performed. The average LAeq,8h of noise-exposed workers was 87 dB (A) with a mean PAR of 7 dB. The prevalence of high-frequency hearing loss was 65% for noise-exposed workers and 33% for the non-noise-exposed employees. The use of earplugs had no observable effect on the prevalence of high-frequency hearing loss of the study participants (OR 0.964, 95% CI 0.925–1.005, p = 0.085). No significant relationship between the effectiveness offered by earplug use and high-frequency hearing thresholds at 3, 4, and 6 kHz was found (t = −1.54, p = 0.125). The mandatory requirement of earplug use without individualized training on how to wear HPDs correctly had no detectable effect on the prevention of hearing loss at the auto parts factory. The hearing conservation program at the surveyed factory was not effective. Periodic hearing tests, earplug fit testing, expanding the offer of different types of hearing protection, and employee education about the importance of protecting their hearing were recommended to the occupational health and safety program.

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