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RISS 인기검색어
- 검색키워드
- 저자 : Akram Pourbakht (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Asymmetric Flankers in Comodulation Masking Release
Akram Pourbakht,Leila Faraji 대한청각학회 2019 Journal of Audiology & Otology Vol.23 No.1
Background and Objectives: Detection of auditory signals may be improved when maskersfar from the frequency of the target signal are coherently amplitude-modulated. This improvementof signal detection is called comodulation masking release (CMR). In the CMR experiments,flankers have been usually arranged symmetrically. In practice, we will be confrontedwith a problem by using symmetric flankers due to the limited output of clinical audiometers,especially at high-frequency. We aimed to check whether flanker arrangement has any effecton the amount of CMR, especially when there is no flankers with a frequency higher than thesignal. Subjects and Methods: Eighteen normal hearing listeners ranging in age from 20 to46 years old participated. Symmetric (2-2) and asymmetric (3-1 and 4-0) flankers were usedand then the amount of CMR compared among them. Results: Our results showed in thesame numbers of flankers, there were no statistically CMR differences between symmetricand asymmetric arrangement. Also when we did not have a flanker at a frequency higherthan the signal and all flankers were placed below the signal, there was no statistically differencewith the symmetric arrangement. Conclusions: The asymmetry of the flankers andalso omitting the flankers with a frequency higher than the signal, have no effect on CMR results. We concluded that CMR can be considered by using clinical audiometer.
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Reza Hoseinabadi,Akram Pourbakht,Nasrin Yazdani,Ali Kouhi,Mohammad Kamali,Farzaneh Zamiri Abdollahi,Sadegh Jafarzadeh 대한청각학회 2018 Journal of Audiology & Otology Vol.22 No.4
Background and Objectives: Although repositioning maneuvers have shown remarkable success rate in treatments of benign paroxysmal positional vertigo (BPPV), the high recurrence rate of BPPV has been an important issue. The aims of present study were to examine the effects of otolith dysfunction on BPPV recurrence rate and to describe the effect of vestibular rehabilitation exercises on BPPV recurrence in BPPV patients with concomitant otolith dysfunction. Subjects and Methods: Forty-five BPPV patients included in this study (three groups). Patients in group 1 had no otolith dysfunction and patients in groups 2 and 3 had concomitant otolith dysfunction. Otolith dysfunction was determined with ocular/cervical vestibular evoked myogenic potential (oVEMP and cVEMP) abnormalities. Epley’s maneuver was performed for the patients in all groups but patients in group 3 also received a 2-month vestibular rehabilitation program (habituation and otolith exercises). Results: This study showed that BPPV recurrent rate was significantly higher in patients with otolith dysfunction in comparison to the group 1 (p<0.05). Vestibular rehabilitation resulted in BPPV recurrence rate reduction. Utricular dysfunction showed significant correlation with BPPV recurrence rate. Conclusions:Otolith dysfunction can increase BPPV recurrence rate. Utricular dysfunction in comparison to saccular dysfunction leads to more BPPV recurrence rate. Vestibular rehabilitation program including habituation and otolith exercises may reduce the chance of BPPV recurrence.
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Seyyed Jalal Sameni,Ahmad Daneshi,Akram Pourbakht,Aliakbar Tahaei,Mohammad Kamali 대한청각학회 2018 Journal of Audiology & Otology Vol.22 No.4
Background and Objectives: In clinical masking, the plateau is a state in which the non-test ear (NTE) is completely masked by the noise and tone is heard only by the test ear (TE). At least 15 to 20 dB of plateau width is needed to obtain valid threshold. In the study, a part of plateau after initial masking level known as the minimum plateau width (mPW) was determined and compared by a new formula and the plateau searching method. Subjects and Methods: Minimum plateau widths of air conduction were obtained in 29 participants with unilateral and 30 participants with bilateral conductive hearing loss (CHL) aged 20 to 45 years old by using step by step plateau method and mPW estimation by the formula between two points of masking diagram [mPW=(N2-N1)-(T2-T1)] and then the mPW of twomethods was compared for each frequency. Results: There was no significant difference between the minimum plateau width obtained by the plateau and formula methods for two given point of masking diagram in people with unilateral and bilateral CHL at octave frequencies from 500 Hz to 4,000 Hz. Conclusions: Threshold obtaining of TE by two tones for two noise levels delivered to the NTE is enough to estimate the mPW between these two noise points and it is not necessary that for clinicians to know the actual values of masking diagram components.
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