scholarly journals Masking Level Difference and Electrophysiological Evaluation in Adults with Normal Hearing

2020 ◽  
Vol 24 (04) ◽  
pp. e399-e406
Author(s):  
Joyce Miranda Santiago ◽  
Cyntia Barbosa Laureano Luiz ◽  
Michele Garcia ◽  
Daniela Gil
Keyword(s):  
Auditory Processing ◽  
Auditory Evoked Potentials ◽  
Normal Hearing ◽  
Central Auditory Processing ◽  
Positive Correlation ◽  
Binaural Interaction ◽  
Level Difference ◽  
Significant Difference ◽  
Masking Level Difference ◽  
The Mean

Abstract Introduction The auditory structures of the brainstem are involved in binaural interaction, which contributes to sound location and auditory figure-background perception. Objective To investigate the performance of young adults in the masking level difference (MLD) test, brainstem auditory-evoked potentials (BAEPs) with click stimulus, and frequency-following response (FFR), as well as to verify the correlation between the findings, considering the topographic origin of the components of these procedures. Methods A total of 20 female subjects between 18 and 30 years of age, with normal hearing and no complaints concerning central auditory processing underwent a basic audiological evaluation, as well as the MLD test, BAEP and FFR. Results The mean result on the MLD test was of 10.70 dB. There was a statistically significant difference in the absolute latencies of waves I, III and V in the BAEPs of the ears. A change in the FFR characterized by the absence of the C, E and F waves was noticed. There was a statistically significant difference in the positive correlation of wave V in the BAEPs with the MLD. There was a statistically significant difference in the positive correlation of the mean MLD and the V, A and F components of the FFR. Conclusion The mean MLD was adequate. In the BAEPs, we observed that the click stimulus transmission occurred faster in the right ear. The FFR showed absence of some components. The mean MLD correlated positively with the BAEPs and FFR.

scholarly journals Evaluation of Binaural Interaction: Age-Related Altering Masking Level Difference in Normal Hearing Individuals

2021 ◽  
Vol 6 (3) ◽  
pp. 585-591
Author(s):  
Ahsen KARTAL ◽  
Barış YAMAN ◽  
Müjde KAYA ◽  
Burcu YERLİKAYA ◽  
Özlem KONUKSEVEN
Keyword(s):  
Normal Hearing ◽  
Binaural Interaction ◽  
Level Difference ◽  
Age Related ◽  
Masking Level Difference

Auditory Temporal-Organization Abilities in School-Age Children With Peripheral Hearing Loss

2013 ◽  
Vol 56 (4) ◽  
pp. 1065-1074 ◽  
Author(s):  
Amineh Koravand ◽  
Benoît Jutras
Keyword(s):  
Hearing Loss ◽  
Auditory Processing ◽  
Normal Hearing ◽  
Temporal Organization ◽  
School Age Children ◽  
Central Auditory Processing ◽  
Central Auditory Processing Disorder ◽  
Verbal Stimuli ◽  
Sequential Organization ◽  
Significant Difference

Purpose The objective was to assess auditory sequential organization (ASO) ability in children with and without hearing loss. Method Forty children 9 to 12 years old participated in the study: 12 with sensory hearing loss (HL), 12 with central auditory processing disorder (CAPD), and 16 with normal hearing. They performed an ASO task in which they were asked to recall 2, 3, and 5 verbal and nonverbal stimuli with an interstimulus interval (ISI) of 425 ms as well as sequences of 2 elements with an ISI of 20 or 1,000 ms. Results No significant difference was found between the group of children with HL and the 2 other groups on nonverbal stimuli in all testing conditions. Regardless of ISI duration or number of elements in the sequence, children with HL had significantly fewer correct responses than children with normal hearing and children with CAPD for the verbal stimuli /ba/–/da/. Children with HL had significantly better performance than children with CAPD for the verbal a/–/da/ when the number of elements in the sequence varied. Conclusions Children with sensory HL showed impaired ASO ability when recalling verbal /ba/–/da/. Results suggest that hearing loss can induce a specific signature when processing these verbal stimuli.

Development of a 500-Hz Masking-Level Difference Protocol for Clinic Use

2003 ◽  
Vol 14 (01) ◽  
pp. 001-008 ◽  
Author(s):  
Richard H. Wilson ◽  
Deborah W. Moncrieff ◽  
Elizabeth A. Townsend ◽  
Amanda L. Pillion
Keyword(s):  
Normal Hearing ◽  
Signal To Noise ◽  
Spectrum Level ◽  
Level Difference ◽  
Masking Level Difference ◽  
Single Interval ◽  
Series Of Experiments ◽  
The Mean ◽  
Perceptual Abilities ◽  
Response Task

The purpose of this series of experiments was to develop a simple, 500-Hz masking-level difference (MLD) protocol that could be implemented easily in the clinic to assess auditory perceptual abilities using an audio compact disc. Five, 300-ms tones with 250-ms intertone intervals were embedded in 3-s bursts of 200-800 Hz noise presented at 42.2-dB pressure-spectrum level with 4-5 s inter-stimulus intervals. The homophasic and antiphasic conditions were interleaved with the signal-to-noise ratios decreasing in 2-dB steps. A single-interval, "yes/no" response task was used. Three experiments were performed on 24-28 listeners with normal hearing. The mean SoNo thresholds (58.1- to 59.5-dB SPL) and the mean SπNo thresholds (45.1- to 46.0-dB SPL) produced ˜13-dB MLDs. Experiment 3 included a SoNπ condition that had a mean threshold of 48.8-dB SPL and a 10.0-dB MLD. The mean test, retest ot the SoNo and SπNo thresholds on 15 listeners was <0.5 dB. Over the three experiments, 95% of the listeners had SπNo MLDs that were ≥10 dB.

scholarly journals Auditory rehabilitation in adults: results of a training program

Revista CEFAC ◽  
2019 ◽  
Vol 21 (5) ◽  
Author(s):  
Cristiane Bueno Sales ◽  
Luciana Macedo de Resende ◽  
Carlos Faria Santos Amaral
Keyword(s):  
Hearing Loss ◽  
Hearing Aids ◽  
Auditory Processing ◽  
Auditory Training ◽  
Functional Improvement ◽  
Moderate Degree ◽  
Behavioral Tests ◽  
Level Difference ◽  
Significant Difference ◽  
Masking Level Difference

ABSTRACT Objective: to describe the findings of the auditory processing behavioral tests in patients with hearing loss before and after hearing aid fitting associated with auditory training. Methods: a descriptive analytical study that compared the findings of the auditory processing evaluation in 22 patients, from 19 to 62 years old, with mild or moderate sensorineural hearing loss. Tests used: Sound localization; Masking Level Difference; Alternate Disyllables Dichotic Listening Test; Melodic Frequency Pattern Test, Melodic Duration Pattern Test; Gaps in Noise; Speech in Noise Test. After the first tests, the patients were fitted with hearing aids and underwent eight auditory training sessions. The tests were retaken after a two-month period. Results: there was a predominance of females and a moderate degree hearing loss. In the comparison of the initial and final assessment situations, a statistically significant difference (p <0.05) was seen in all conditions studied, except for the Gaps in Noise and Masking Level Difference tests. Conclusion: the results have proven that the auditory training performed in adult users of hearing aids brought about significant improvements on the auditory processing skills, thus, modifying their auditory behavior. The improvement of the results of the auditory processing behavioral tests in the initial and final situations reflects the hearing functional improvement achieved.

Vowel Recognition Threshold as a Function of Temporal Segmentations

1970 ◽  
Vol 13 (4) ◽  
pp. 715-724 ◽  
Author(s):  
Richard L. Powell ◽  
Oscar Tosi
Keyword(s):  
Normal Hearing ◽  
Recognition Threshold ◽  
Vowel Sound ◽  
Significant Difference ◽  
The Mean ◽  
Vowel Recognition ◽  
Temporal Segment

Vowels were segmented into 15 different temporal segments taken from the middle of the vowel and ranging from 4 to 60 msecs, then presented to 6 subjects with normal hearing. The mean temporal-segment recognition threshold of 15 msecs with a range from 9.3 msecs for the /u/ to 27.2 milliseconds for the /a/. Misidenti-fication of vowels was most often confused with the vowel sound adjacent to it on the vowel-hump diagram. There was no significant difference between the cardinal and noncardinal vowels.

scholarly journals Effect of Auditory Maturation on the Encoding of a Speech Syllable in the First Days of Life

2021 ◽  
Vol 11 (7) ◽  
pp. 844
Author(s):  
Laís Ferreira ◽  
Piotr Henryk Skarzynski ◽  
Magdalena Beata Skarzynska ◽  
Milaine Dominici Sanfins ◽  
Eliara Pinto Vieira Biaggio
Keyword(s):  
Language Development ◽  
Speech Sound ◽  
Normal Hearing ◽  
Auditory Maturation ◽  
Significant Difference ◽  
Sound Changes ◽  
The Mean ◽  
Neonates And Infants

(1) Background: In neonates and infants, the physiological modifications associated with language development are reflected in their Frequency Following Responses (FFRs) in the first few months of life. (2) Objective: This study aimed to test the FFRs of infants in the first 45 days of life in order to evaluate how auditory maturation affects the encoding of a speech syllable. (3) Method: In total, 80 healthy, normal-hearing infants, aged 3 to 45 days old, participated in this study. The sample was divided into three groups: GI, 38 neonates from 3 to 15 days; GII, 25 infants from 16 to 30 days; and GIII, 17 infants from 31 to 45 days. All participants underwent FFR testing. Results: With age, there was a decrease in the latency of all FFR waves, with statistically significant differences among the groups studied for waves V, A, E, F, and O. The mean amplitudes showed an increase, with a statistically significant difference only for wave V. The slope measure increased over the 45 days, with a statistically significant difference between GIII and GI and between GIII and GII. (4) Conclusions: The encoding of a speech sound changes with auditory maturation over the first 45 days of an infant’s life.

scholarly journals P3 Cognitive Potential in Cochlear Implant Users

2018 ◽  
Vol 22 (04) ◽  
pp. 408-414 ◽  
Author(s):  
Signe Grasel ◽  
Mario Greters ◽  
Maria Goffi-Gomez ◽  
Roseli Bittar ◽  
Raimar Weber ◽  
...  
Keyword(s):  
Speech Recognition ◽  
Cochlear Implant ◽  
Auditory Processing ◽  
Evoked Potential ◽  
Control Group ◽  
Central Auditory Processing ◽  
Speech Discrimination ◽  
Significant Difference ◽  
Cortical Responses ◽  
Peripheral Auditory System

Introduction The P3 cognitive evoked potential is recorded when a subject correctly identifies, evaluates and processes two different auditory stimuli. Objective to evaluate the latency and amplitude of the P3 evoked potential in 26 cochlear implant users with post-lingual deafness with good or poor speech recognition scores as compared with normal hearing subjects matched for age and educational level. Methods In this prospective cohort study, auditory cortical responses were recorded from 26 post-lingual deaf adult cochlear implant users (19 with good and 7 with poor speech recognition scores) and 26 control subjects. Results There was a significant difference in the P3 latency between cochlear implant users with poor speech recognition scores (G-) and their control group (CG) (p = 0.04), and between G- and cochlear implant users with good speech discrimination (G+) (p = 0.01). We found no significant difference in the P3 latency between the CG and G+. In this study, all G- patients had deafness due to meningitis, which suggests that higher auditory function was impaired too. Conclusion Post-lingual deaf adult cochlear implant users in the G- group had prolonged P3 latencies as compared with the CG and the cochlear implant users in the G+ group. The amplitudes were similar between patients and controls. All G- subjects were deaf due to meningitis. These findings suggest that meningitis may have deleterious effects not only on the peripheral auditory system but on the central auditory processing as well.

Are ‘‘Dichotic’’ Deficits Uniquely Dichotic? Investigating Dichotic Performance with the Dichotic Digits Difference Test (DDdT) in a Large Clinical Population of Children Referred for an Auditory Processing Assessment

2020 ◽  
Author(s):  
Sharon Cameron ◽  
Harvey Dillon
Keyword(s):  
Auditory Processing ◽  
Large Population ◽  
Clinical Population ◽  
Clinical Group ◽  
Central Auditory Processing ◽  
Typically Developing ◽  
Central Auditory Processing Disorder ◽  
Significant Difference ◽  
Z Scores ◽  
Listening Task

Background: Previous studies in a large population of typically developing (TD) children and a smallclinical group showed high correlations between the dichotic and diotic conditions of the Dichotic Digitsdifference Test (DDdT), as well as between DDdT performance and measures of memory and attention.Purpose: The purpose of the study was to investigate the performance on the DDdT in a large clinical sample.Research Design: Correlational analysis between the DDdT diotic condition and the dichotic free recall (FR)right-ear, left-ear, and total (ear-averaged) conditions, as well as between DDdT and memory performance.Study Sample: One hundred one children (6 years, 3 months to 15 years, 0 months, mean 9 years, 6 months)were referred for assessment to the Australian Hearing Central Auditory Processing Disorder (CAPD) service.Results were compared with data from 112 TD children collected from previously published studies.Data Collection and Analysis: Z-scores were used to account for the effect of age on performance.Mean differences between clinical and TD children were investigated using analysis of variance(ANOVA). Pearson product-moment correlations determined the strength of relationships between DDdTconditions and the number memory forward (NMF) and reversed (NMR) subtests of the Test of AuditoryProcessing Skills—Third Edition.Results: Performance by the clinical group on the DDdT dichotic FR (RE, LE, and total) conditions wassignificantly correlated with the diotic condition (r = 0.7; 0.7, 0.8; p < 0.001). Significant correlations werefound between the DDdT diotic and dichotic FR conditions and the NMF (r = 0.5–0.6, p < 0.001) andNMR (r = 0.2–0.5, p < 0.025–0.001). ANOVA revealed no significant difference between the TD andclinical groups (p = 1.0000) in respect to the advantage they got from dichotic listening (calculated asdichotic FR total minus diotic score). Multiple regression revealed that diotic performance and short-termmemory accounted for 68% of the variation in dichotic performance. Random measurement erroraccounted for a further 16%.Conclusions: Factors other than dichotic performance strongly impact a child’s ability to perform a dichoticdigit listening task. This result has widespread implications in respect to the interpretation of CAPDtest results.

scholarly journals 563. Association Between Chlorhexidine Gluconate Concentrations and Resistant Bacterial Bioburden on Skin

2019 ◽  
Vol 6 (Supplement_2) ◽  
pp. S267-S267
Author(s):  
Gita Nadimpalli ◽  
Lyndsay M O’Hara ◽  
Surbhi Leekha ◽  
Lisa Harris ◽  
Natalia Blanco ◽  
...  
Keyword(s):  
Methicillin Resistant Staphylococcus Aureus ◽  
Chlorhexidine Gluconate ◽  
Bacterial Burden ◽  
Positive Correlation ◽  
Carbapenem Resistant ◽  
Significant Difference ◽  
The Mean ◽  
Vancomycin Resistant ◽  
Spearman’S Correlation ◽  
Carbapenem Resistant Enterobacteriaceae

Abstract Background Little research exists to guide optimal Chlorhexidine gluconate (CHG) bathing practices. We examined the association between CHG concentrations and methicillin-resistant Staphylococcus aureus (MRSA), carbapenem-resistant Enterobacteriaceae (CRE), and vancomycin-resistant Enterococcus (VRE) on the skin. Also, we studied whether bioburden is affected by bathing method (2% CHG cloth vs. 4% liquid CHG soap) and time since last CHG bath. Methods Patients with MRSA, CRE and VRE at 4 US hospitals were enrolled. Skin swabs (arm, chest) were collected to quantify bioburden and CHG concentrations. Information on bathing method and time since last CHG bath was collected. χ 2 test, Spearman’s correlation, and linear regression were performed. Results 253 patients were enrolled. On arm skin, MRSA was detected in 17 (19%), CRE on 16 (12%), and VRE on 12 (21%) patients. Detectable CHG levels were observed in 82 (93%) MRSA, 81 (79%) CRE, and 44 (79%) VRE patients. A negative correlation was observed between bioburden and CHG concentration for MRSA (rs = −0.11, P = 0.28) and CRE (rs = −0.02, P = 0.82) while a positive correlation was observed for VRE (rs = 0.15, P = 0.28). On chest skin, MRSA was detected in 25 (28%), CRE on 18 (12%), and VRE on 7 (13%) patients. Detectable CHG levels were observed in 83 (95.4%) MRSA, 78 (72%) CRE, and 43 (77%) VRE patients. MRSA bioburden was negatively correlated with CHG concentration (rs = −0.16, P = 0.12), while a positive correlation was noted for CRE (rs = 0.18, P = 0.06) and VRE (rs =0.24, P = 0.06). There was no significant difference in bacterial bioburden between CHG concentrations (>20 ppm vs. ≤20 ppm) at both skin sites (Table 1). The bioburden did not differ by method of CHG bath. The mean estimates of bacterial bioburden on both skin sites did not show a significant decrease with increase in CHG concentrations and were not affected by time since last bath (Table 2). Conclusion Detection of MRSA, CRE and VRE was infrequent irrespective of CHG bathing method and time since last bath. We found inconsistent associations between increasing CHG concentrations and bacterial bioburden. CHG bathing frequency may be optimized for individual patient populations to augment the reduction of bacteria. Additional research to understand the association of CHG skin concentrations and resistant bacterial burden is required. Disclosures All authors: No reported disclosures.

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