comparison study on the time -frequency specifity of normal cochlear in infants and adults

Analysis of transient evoked otoacoustic emissions [TEOAEs] is of considerable interest due to their close relation with cochlear mechanisms which reveal cochlear function.The particular structure of TEOAEs requires a method with both a satisfactory time and frequency resolution. Among different methods the time -frequency techniques are the most suitable approaches. The aim of this study was to investigate the differences between neonate's cochlear function and adult's cochlear function using time -frequency approaches in TEOAEs. The data of this cohort study was obtained from a sample of 23 normal neonates, aged between 1-28 days, and 31 normal adults, aged between 18 -25 years.TEOAEs with click stimulus were performed for both ears .The TEOAEs files were investigated in time - frequency transform software in off-line mode. The signal to noise ratio [SNR] and response level [dB] of TEOAEs were analysed. The reproducibility, SNR and response level in neonates was greater than adults and in both groups there were no significant difference between responses of males and females and of the right and the left ears. There are differences between neonate's and adult's cochlear response. High frequencies responses are stronger in neonate's cochlea

[Internal evaluation of audiology department, faculty of rehabilitation, Tehran university of medical sciences, Iran]

Internal Evaluation means assessment of abilities and potentials. To promote the quality of education, research, health and finally rehabilitation is one of the most important roles and responsibilities of the universities. Promotion of quality of the theoretical and practical education for the Audiology students provides this major with its final goal that is to serve society. The purpose of this study was to evaluate the strength, weaknesses, opportunities and threats [SWOTs] of the Audiology department and to identify the ways of diminishing weaknesses and threats. This descriptive cross-sectional study was conducted on undergraduates, postgraduates, graduates, academic staff, and the director of Audiology department in 9 areas, including management flowchart, educational programs, instructional methods and curriculum models, students, educational areas and equipments, graduate, academic staff, research, and treatment. Data were collected by questionnaires. Results were analyzed descriptively and were expressed in raw and percentage. The scores of areas in two measures were as follows: management flowchart 4.36 [87.31%], educational programs 4.17 [83.58%], instructional methods and curriculum models 4.01 [80.26%], students 3.43 [68.60%], educational areas and equipment 3.60 [72.11%], from the view of undergraduates, post graduates, faculties, graduates 3.60 [72.03%], academic staff 4.03 [80.6%], research 3.52 [70.4%], and treatment 4.54 [90.80%]. The highest score was, therefore, of the treatment area and the lowest belonged to the educational area and equipments. The score of the Audiology department, as the main factor was 3.89 out of 5 which was 77.88%. Audiology group total score indicates the desirable status that can be promoted to the most desirable if SWOTs are considered

[ effect of music on hearing of string musicians]

Hearing sensitivity is so vital for musicians as loud music can cause hearing loss. The aim of this study was to assess hearing sensitivity of musicians in order to determine the effects of music exposure on hearing organ. This case-control study was conducted on 15 string musicians with musicianship history of more than 10 years and 15 normal hearing subjects. They all were male and 20-30 years old. TEOAE and DPOAE performed and after otoscopy, immittance and pure tone audiometry in octave frequencies between 250 to 16000 Hz. There is not significant difference between pure tone thresholds of two groups for all frequencies. A significant difference of TEOAE is found between two groups for total response and amplitudes of TEOAE .DPOAE amplitudes are not significantly different between two groups. Musicianship may affect TEOAE amplitudes, but cannot affect results of PTA and DPOAE. Therefore this can be useful to detect cochlear lesions secondary to music exposure and also as a tool in hearing protection program