CURRENT ACADEMIC ROLE & RESPONSIBILITIES
- Teaching: Undergraduate and Post graduate students
- Clinical supervision and patient care
- Class coordinator: I M.Sc (Audiology)
- Guide: Conference presentations/Clinical & Journal clubs
SUBJECTS CURRENTLY TEACHING
|Diagnostic Audiology: Behavioral Tests||B. 3.3||Third Semester BASLP|
|Auditory Disorders||A 202||Second Semester - M.Sc (Audiology)|
|Degree||Specialisation||Institute||Year of passing|
|Doctorate in Philosophy in Audiology||Audiology||All India Institute of Speech and Hearing, University of Mysore||2016|
|M.Sc||Audiology||All India Institute of Speech and Hearing, University of Mysore||2010|
|B.Sc||Speech and Hearing||All India Institute of Speech and Hearing, University of Mysore||2008|
|Institution / Organisation||Designation||Role||Tenure|
|Department of Audiology and Speech Language Pathology, KMC, MAHE, Mangalore||Assistant Professor – Senior Scale||Teaching, Research, Clinical Management||Jan 2018 – till date|
|Department of Audiology and Speech Language Pathology, KMC, MAHE, Mangalore||Assistant Professor||Teaching, Research, Clinical Management||Oct 2017 - Jan 2018|
|Nitte Institute of Speech and Hearing, Deralakatte, Mangaluru||Assistant Professor Grade I||Teaching, clinical supervision and research||June 2016 - Sep 2017|
|Nitte Institute of Speech and Hearing, Deralakatte, Mangaluru||Lecturer||Teaching, clinical supervision and research||Jan 2015 - May 2016|
|All India Institute of Speech and Hearing, Mysore||Junior Research Fellow||Research||Dec 2011 - Dec 2014|
|All India Institute of Speech and Hearing, Mysore||Audiologist Grade I||Clinical teaching||Aug 2010 - Dec 2011|
AREAS OF INTEREST, EXPERTISE AND RESEARCH
Area of Interest
Diagnostic Audiology, Speech Perception
Area of Expertise
Area of Research
Speech perception, Efferent auditory pathway
Professional Affiliations & Contributions
- Member of Rehabilitation Council of India (RCI), 2010
- Member of Indian Speech and Hearing Association (ISHA), 2008.
- Member of Dakshina Kannada - Indian Speech and Hearing Association, 2016.
Does dyslipidemia worsen the hearing level in diabetics?
2017-01-10 Journal of Otology, 2017, Vol 12, Issue 4, Pg 198-201 Deepika Pratap Rajeshwary A. Usha Shastri Goutham M.K. Raghav Sharma
Objective: To identify the effect of dyslipidemia on auditory function detected by Pure Tone Audiometry. To check if dyslipidemia worsens the hearing level in diabetics. Design: This was a comparative study where 120 subjects between the age group of 20 and 50 years underwent pure tone audiometry, lipid profile and blood sugars. Group 1 consisted of 30 subjects with type 2 diabetes and dyslipidemia; Group 2 had 30 subjects with isolated diabetes; Group 3 had 30 with isolated dyslipidemia and Group 4 included 30 normal subjects as control. Results: Significant hearing loss was seen only in the group with isolated diabetes (63%). The most common type of hearing loss was high frequency sensorineural hearing loss. When comparison was made between the combinations of different lipid profiles, no association was found to the level of hearing. Conclusions: Diabetics are more prone to high frequency hearing loss. Altered lipid profile has no role in causing hearing loss.
Cortical Auditory Event Related Potential (P300) for frequency changing dynamic tones
2016-04-01 Journal of Audiology and Otology, 2016, Vol 20, Issue 1, Pg 22-30 Mohan Kumar Kalaiah Usha Shastri
Background and Objectives: P300 has been studied with a variety of stimuli. However, the nature of P300 has not been investigated for deviant stimuli which change its characteristics from standard stimuli after a period of time from onset. Subjects and Methods: Nine young adults with normal hearing participated in the study. The P300 was elicited using an oddball paradigm, the probability of standard and deviant stimuli was 80% and 20% respectively. Six stimuli were used to elicit P300, it included two pure-tones (1,000 Hz and 2,000 Hz) and four tone-complexes (tones with frequency changes). Among these stimuli, 1,000 Hz tone served as standard while others served as deviant stimuli. The P300 was recorded in five separate blocks, with one of the deviant stimuli as target in each block. Electroencephalographic was recorded from electrode sites Fz, Cz, C3, C4, and Pz. Latency and amplitude of components of the cortical auditory evoked potentials were measured at Cz. Results: Waveforms obtained in the present study shows that, all the deviant stimuli elicited obligatory P1-N1-P2 for stimulus onset. 2,000 Hz deviant tone elicited P300 at a latency of 300 ms. While, tone-complexes elicited acoustic change complex (ACC) for frequency changes and finally elicited P300 at a latency of 600 ms. In addition, the results showed shorter latency and larger amplitude ACC and P300 for rising tone-complexes compared to falling tone-complexes. Conclusions: Tone-complexes elicited distinct waveforms compared to 2,000 Hz deviant tone. Rising tone-complexes which had an increase in frequency elicited shorter latency and larger amplitude responses, which could be attributed to perceptual bias for frequency changes.
Descending auditory pathway and identification of phonetic contrast by native listeners
2016-01-02 Journal of the Acoustical Society of America, 2014, Vol 135, Issue 2, Pg 896-905 Usha Shastri Mythri H. M Ajith Kumar U
The present study investigated the ability of native listeners to identify subtle phonetic contrasts in nonsense words and its relationship with the contralateral inhibition of transient evoked otoacoustic emissions (TEOAE). A group of 45 young adults with normal hearing sensitivity who were native speakers of Malayalam participated in the behavioral experiment. Phone identification score and reaction time for four phonetic pairs in nonsense words were measured for each participant. Based on the phone identification score, the participants were divided into high and low performers. Twelve participants randomly selected from each group were evaluated for contralateral inhibition of TEOAEs. Phone identification score and global contralateral inhibition amplitude of TEOAE were significantly higher and reaction time was significantly shorter in high performers than that of low performers. Significant correlation was found between the phone identification score and contralateral inhibition of TEOAE. Strength of the medial olivocochlear bundle activity explained about 30% of the variance in the phone identification scores providing evidence for the involvement of the descending auditory pathways in identifying the phonetic contrasts that are acoustically similar. These results support the emerging view that top down influences from higher centers shapes the responses of lower centers.
Production and perception of lexical tones in Manipuri language
2014-01-12 Journal of advanced linguistic studies, 2014, Vol 3, Issue 1-2, Pg 216-231 Usha Shastri Ajith Kumar U
There is a discrepancy in the established number of lexical tones in Manipuri, a tonal language, as well as the terminology used to describe them. Hence, the present study attempts to describe the characteristics of lexical tones in monosyllabic and bisyllabic words in Manipuri using acoustical analysis and its perception by eight native speakers. Minimal pair words contrasting in tone were recorded from three native speakers of Manipuri. Pitch values extracted for each word were used to identify different tone contours based on the configuration of the pitch contour, initial pitch and final pitch. Results revealed four pitch contours namely, level, falling, rising, and falling-rising in monosyllabic words. First syllable of the bisyllabic words revealed level-high and level-low controus. The second syllable showed level, rising and falling contours. In addition, individual differences were noticed in the pitch contours obtained for the same word across speakers. However, for each speaker, each minimal word pair were always distinguishable using pitch contour, initial pitch and final pitch of the pitch contour. The meaning of all the words was identified correctly above chance level by native speakers. It is possible that normalization of the lexical tones produced by different speakers was done by the listeners.
Comparison of performance between air conduction hearing and bone anchored hearing aid attached to the headband
2011-01-01 Student Research at AIISH Mysore, 2011, Vol VIII, Part – A, Pg 243-256 Usha Shastri Manjula P
The present study aimed at investigating the perception abilities and quality ratings of speech with air conduction hearing aid and Bone Anchored Hearing Aid (BAHA) attached to the headband. The performance was compared with bone conduction hearing aid on a small group of participants. The study included data collected from 23 ears of 17 individuals with bilateral hearing loss having either conductive or mixed hearing loss in the test ear. Sound field warble tone thresholds, uncomfortable loudness level, speech identification in quiet, speech recognition threshold in noise and quality judgment of speech were measured in three aided conditions i.e., with air conduction hearing aid, with bone conduction hearing aid and with BAHA attached to the headband. The results revealed that in the pre-implant condition, both BAHA attached to the headband and air conduction hearing aid yield comparable results in individuals with conductive and mixed hearing loss. Though the performance with air conduction hearing aid was slightly better than that with BAHA attached to the headband, the difference is not significantly different in most of the parameters that were measured in the present study. Significantly better thresholds were obtained with air conduction hearing aid only on aided thresholds at 2000 Hz and 4000 Hz compared to BAHA attached to the headband. No correlation could be obtained in an attempt to find the effect of air-bone gap on the performance with BAHA attached to the headband and air conduction hearing aid.
Relationship between working memory and identification of a few native phonetic contrasts
Communication Sciences & Disorders. 2019, 24(1), 117–128
Short term test-retest reliability of contralateral inhibition of distortion product otoacoustic emissions
2019-22-08 Mohan Kumar K Alina Lasrado Nikita Pinto Usha Shastri
Journal of Audiology and Otology. 2019, 22(4), 189–196