Three Experiments on the California Consonant Test

1979 ◽  
Vol 44 (1) ◽  
pp. 61-72 ◽  
Author(s):  
Daniel M. Schwartz ◽  
Rauna K. Surr
Keyword(s):  
Hearing Loss ◽  
Word Recognition ◽  
Sensorineural Hearing Loss ◽  
Normal Distribution ◽  
High Frequency ◽  
Correlation Coefficients ◽  
Sigmoidal Function ◽  
High Frequency Hearing Loss ◽  
Wide Variability ◽  
Intensity Functions

Three experiments were conducted using the California Consonant Test (CCT). Initially, performance-intensity functions were obtained for both normal hearers, and those with high frequency sensorineural hearing loss. Results demonstrated almost a linear function for both subject groups (approaching asymptote at 50 dB SL) as compared to the typical sigmoidal function obtained with conventional word recognition tests. Experiment II compared results of the CCT to those of the N.U. No. 6 lists in 60 subjects with high frequency hearing loss. Consistent with previous findings, relatively high word recognition scores were obtained for the NU-6 materials whereas the range of scores on the CCT approximated a normal distribution. Experiment III examined the internal consistency and split-half reliability of the CCT. Despite significant (p ≤ 0.05) correlation coefficients, the wide variability between half-list scores among individual listeners does not support the use of half-list testing.

Perceived Effects of High Frequency Hearing Loss in a Farming Population

2003 ◽  
Vol 14 (02) ◽  
pp. 100-108 ◽  
Author(s):  
Michael Stewart ◽  
Jina Scherer ◽  
Mark E. Lehman
Keyword(s):  
Hearing Loss ◽  
High Frequency ◽  
Noise Exposure ◽  
Correlation Coefficients ◽  
High Frequency Hearing Loss ◽  
Hearing Sensitivity ◽  
Increased Risk ◽  
Study Results ◽  
Hearing Handicap ◽  
Perceived Effects

Previous research has suggested that farmers are at increased risk for noise-induced hearing loss (NIHL) due to excessive amounts of loud noise exposure from farming equipment. This study was conducted to determine the perceived effects of hearing loss in a small farming population. Ninety-three subjects, ranging in age from 18 to 75 years and actively engaged in the farming industry, were asked to complete a case history form regarding noise exposure and demographic information. Hearing sensitivity was assessed by obtaining air conduction thresholds at audiometric test frequencies 500-8000 Hz bilaterally. Subjects completed the Self Assessment of Communication (SAC) hearing handicap scale if any threshold in either ear was poorer than 25 dB HL. Study results revealed that the presence of high-frequency hearing loss and perceived hearing handicap increased with age, with the largest effects seen in those over 50 years of age. The relationship between SAC scores and four hearing handicap formulae utilizing different pure-tone averages was also investigated. The highest correlation coefficients occurred for formulae employing higher frequencies and excluding 500 Hz in the calculation. Implications of this study are that audiologists should be aware of the potential hearing handicap associated with high-frequency hearing loss in the farming population and educational programs concerning the dangers of noise and ways to prevent NIHL should be developed for those in farming occupations.

scholarly journals A study of cisplatin chemotherapy and hearing loss

2018 ◽  
Vol 4 (5) ◽  
pp. 1297 ◽  
Author(s):  
L. Sivasankari ◽  
Lalitha Subramanian
Keyword(s):  
Hearing Loss ◽  
Sensorineural Hearing Loss ◽  
Hair Cells ◽  
High Frequency ◽  
Chemotherapeutic Agents ◽  
Sensorineural Hearing ◽  
Cochlear Hair Cells ◽  
High Frequency Hearing Loss ◽  
Auditory Monitoring

<p class="abstract"><strong>Background:</strong> Various medications have been associated with ototoxicity. Platinum containing chemotherapeutic agents are associated with cochleotoxicity, characterized by high frequency hearing loss. Cisplatin and related agents are absorbed by the cochlear hair cells, resulting in ototoxicity through the production of reactive oxygen species.</p><p class="abstract"><strong>Methods:</strong> About 67 patients, irrespective of the type of cancer, fit to undergo chemotherapy were considered for study after meticulous examination. Audiograms were taken prior to chemotherapy, at the end of each cycle of chemotherapy, and follow-up audiograms at 3 months and 6 months after completion of chemotherapy.  </p><p class="abstract"><strong>Results:</strong> Among 37% of the patients with normal hearing, 10% of the patients developed sensorineural hearing loss after treatment. Among 63% of the patients with prior mild sensorineural hearing loss, 11.8% developed worsening of hearing after completion of treatment.</p><p class="abstract"><strong>Conclusions:</strong> Audiologic monitoring is important in patients undergoing cisplatin chemotherapy and post- chemotherapy auditory monitoring is essential to rehabilitate the patients with Sensorineural hearing loss.</p>

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.

Caudal Pontine Reticular Formation of C57BL/6J Mice: Responses to Startle Stimuli, Inhibition by Tones, and Plasticity

1998 ◽  
Vol 79 (5) ◽  
pp. 2603-2614 ◽  
Author(s):  
Stephanie Carlson ◽  
James F. Willott
Keyword(s):  
Hearing Loss ◽  
Reticular Formation ◽  
Auditory System ◽  
Neural Plasticity ◽  
High Frequency ◽  
Acoustic Startle ◽  
Acoustic Startle Response ◽  
Pontine Reticular Formation ◽  
High Frequency Hearing Loss ◽  
Old Mice

Carlson, Stephanie and James F. Willott. Caudal pontine reticular formation of C57BL/6J mice: responses to startle stimuli, inhibition by tones, and plasticity. J. Neurophysiol. 79: 2603–2614, 1998. C57BL/6J (C57) mice were used to examine relationships between the behavioral acoustic startle response (ASR) and the responses of neurons in the caudal pontine reticular formation (PnC) in three contexts: 1) responses evoked by basic startle stimuli; 2) the prepulse inhibition (PPI) paradigm; and 3) the effects of high-frequency hearing loss and concomitant neural plasticity that occurs in middle-aged C57 mice. 1) Responses (evoked action potentials) of PnC neurons closely paralleled the ASR with respect to latency, threshold, and responses to rapidly presented stimuli. 2) “Neural PPI” (inhibition of responses evoked by a startle stimulus when preceded by a tone prepulse) was observed in all PnC neurons studied. 3) In PnC neurons of 6-mo-old mice with high-frequency (>20 kHz) hearing loss, neural PPI was enhanced with 12- and 4-kHz prepulses, as it is behaviorally. These are frequencies that have become “overrepresented” in the central auditory system of 6-mo-old C57 mice. Thus neural plasticity in the auditory system, induced by high-frequency hearing loss, is correlated with increased salience of the inhibiting tones in both behavioral and neural PPI paradigms.

scholarly journals High Frequency Hearing Loss and Hyperactivity in DUX4 Transgenic Mice

PLoS ONE ◽  
2016 ◽  
Vol 11 (3) ◽  
pp. e0151467 ◽  
Author(s):  
Abhijit Dandapat ◽  
Benjamin J. Perrin ◽  
Christine Cabelka ◽  
Maria Razzoli ◽  
James M. Ervasti ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Transgenic Mice ◽  
High Frequency ◽  
High Frequency Hearing Loss

Saccular damage in patients with high-frequency sensorineural hearing loss

2006 ◽  
Vol 263 (7) ◽  
pp. 608-613 ◽  
Author(s):  
A. A. Sazgar ◽  
V. Dortaj ◽  
K. Akrami ◽  
S. Akrami ◽  
A. R. Karimi Yazdi
Keyword(s):  
Hearing Loss ◽  
Sensorineural Hearing Loss ◽  
High Frequency ◽  
Sensorineural Hearing
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