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  Citation statistics : Table of Contents
   2019| July-December  | Volume 33 | Issue 2  
    Online since December 11, 2019

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Noise measurement across different land-use patterns
Sreeraj Konadath, Akshay Mahadeva, Suma Chatni
July-December 2019, 33(2):55-62
Introduction: In the current scenario, with noise exposure having serious effects on the well-being of an individual, it becomes necessary to monitor the noise levels in the environment and keep them under the permissible limits. The present research was aimed to measure and compare noise levels in different land-use patterns and also to identify a minimum duration required to obtain a stabilized LAeq values in environmental noise measurement. Methods: Noise measurements were carried out across residential, commercial, sensitive, and mixed land-use patterns during morning and afternoon time frames. The obtained results were represented using isopleth noise maps. Results: It was noted that noise levels exceeded the prescribed limits in all the four land-use categories. The greatest level of noise was noted in commercial areas followed by mixed, sensitive, and residential land-use types. Significant variations in LAeq values were noted only up to 10 min of noise measurement, and measured noise levels were stabilized beyond 10-min time mark in all the land-use categories. Conclusion: The higher noise levels recorded in the city would bring about adverse health effects on city dwellers in the long run, thus calling for strict law enforcement related to monitoring of noise levels and keeping them in check.
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Adaptation of “Adult aural rehabilitation guide” in Marathi and its utility in evaluation of postlingual adult cochlear implanted recipients
Deepa Aniket Valame, Aparna N Nandurkar, Disha Rao
July-December 2019, 33(2):63-70
Introduction: There is a need for a systematic assessment and training module in Marathi to ascertain the auditory performance of adult cochlear implantation (CI) recipients and to provide a standard regimen for treatment. The present study aimed to adapt the adult aural rehabilitation guide (AARG) in Marathi and to evaluate the performance of adult CI recipients using this tool; and to study the effect of chronological age, duration of the unaided hearing, postimplant duration (PID), and presence/absence of training on the auditory performance of adult CI recipients. Methods: Analytic and synthetic sections from the AARG were adapted in Marathi based on the acoustic-phonetic properties of Marathi. Two separate manuals – assessment manual and training manual – were developed. The assessment tool was administered on 26 adult postlingual CI recipients who were native speakers of Marathi. Training manual was used in two participants for a step-by-step aural rehabilitation program of eight sessions. Results: Most participants achieved scores above 20 for the analytic section, but <20 in synthetic section, out of a maximum score of 29. The difficulty was greater for open-set tasks, for sentences with uncommon words, and for longer sentences. Recipients could not use auditory commands for information transfer, seeking information, and in role-play. There was no correlation of auditory performance with chronological age, duration of unaided hearing, and PID of participants. The scores obtained were correlated to the presence/absence of previous rehabilitation. Conclusion: This study could successfully bring out a systematic assessment protocol in Marathi for postlingual CI recipients, and developed a systematic training module for their rehabilitation.
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Effect of musical training on psychophysical abilities and working memory in children
Chandni Jain, N Devi, Sindhu Parthasarathy, S Kavitha
July-December 2019, 33(2):71-74
Introduction: Music involves fine modulations of intensity, frequency, and temporal aspects and musicians can distinguish these fine variations due to their extensive training. The long-term musical practice has been found to result in the improvement of various auditory and cognitive skills. The aim of the present investigation was to study the effect of musical training on psychophysical abilities and working memory in children. Methods: Total of 30 participants in the age range of 10 to 15 years were recruited for the study. They were equally divided into two groups. Group I had children trained in Carnatic music for more than three years and group II included 15 children with no formal musical training. Psychophysical abilities were assessed using all three frequency, intensity, and temporal parameters. Frequency discrimination and intensity discrimination was assessed through differential limen of frequency (DLF) and differential limen of intensity (DLI) at 2000 and 4000 Hz. Temporal parameters were assessed through a gap detection test (GDT), temporal modulation transfer function (TMTF), and duration discrimination test (DDT). Working memory was assessed using digit span and operation span test respectively. Results: Results showed that children with musical training had significantly better scores for DLI, DLF, GDT, and DDT. However, there was no significant difference in TMTF scores between the groups. Further, a significant better score for digit span task was obtained by children with musical training. But no significant difference was noted for operational span task between the groups. Conclusion: To conclude, the study shows the importance of musical training in fine-tuning the auditory system and its significance in ameliorating auditory psychoacoustic skills and auditory memory.
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Speech perception in quiet and in different types of noise in children with learning disability
Kumari Apeksha, SY Aishwarya, HL Spandita
July-December 2019, 33(2):75-78
Introduction: Studies suggest that children with learning disability (LD) have poor phonological representation. Furthermore, in individuals with LD, it has been reported that in spite of having normal intelligence, they have poor speech perception in quiet and in the presence of noise. As per the literature, there was no published report which highlights pattern perception in quiet and in the presence of different types of noise in children with LD. Thus, the present study aimed to assess pattern perception in quiet and in the presence of noise in typically developing children and in children with LD. Methods: A total of forty children including twenty typically developing children and twenty children with LD in the age range of 5–10 years were included in the study. Word identification scores were calculated in quiet and in the presence of different types of noise at 0 dB signal-to-noise ratio. The words used as stimuli contained a different number of syllables (monosyllable, bisyllables, and trisyllables). Results: Children with LD had poor performance in quiet, in the presence of speech babble, and speech noise compared to typically developing children. The response was best in quiet condition followed by in presence of noise (speech babble and speech noise). Compared across noise conditions, the responses obtained in the presence of speech noise did not differ significantly compared to response obtained in the presence of speech babble. Compared across syllables, trisyllables yielded the best result followed by bisyllables and the least perceived was monosyllables. Conclusion: The present study highlights the poor phonological processing of speech in children with LD and also represents the effect of noise on the speech perception. This study also highlights the poor pattern perception seen in children with LD.
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Effects of variation in response filter on ocular vestibular-evoked myogenic potentials: A preliminary investigation
Niraj Kumar Singh, Kumaran Thirunavukkarasu, Prawin Kumar, Animesh Barman
July-December 2019, 33(2):79-84
Introduction: The concurrent literature reflects wide variations in the use of response filter for acquiring ocular vestibular-evoked myogenic potentials (oVEMPs). However, there is dearth of published reports on the effects of changes in response filter on oVEMP. Therefore, the present study aimed at evaluating the effect of variations in the response filter on oVEMP and identifying the optimum filter set for its clinical recording. Methods: Contralateral oVEMPs were elicited in response to 500 Hz tone bursts from thirty healthy individuals. The low-pass filters used were 500, 700, 1000, 1500, 2000, and 3000 Hz, and the high-pass filters used were 1, 10, and 30 Hz, in all possible combinations. Results: There was a significant reduction in n1- and p1-latencies with increase in high-pass and low-pass filters (P < 0.05). Further, there was a significant reduction in peak-to-peak amplitude with increasing the high-pass filter (P < 0.05) but not for low-pass filters. Conclusions: Owing to the finding of the largest amplitude for a 1-Hz high-pass filter and presence of some amount of energy up to 1000 Hz in the power spectrum, 1–1000 Hz appears to be the optimum filter setting for clinical recording of oVEMP.
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