Soo-Jin Cho

Reference sound pressure level for Korean speech audiometry

Abstract Objective: The purpose of this study was to examine the reference sound pressure level (RSPL) for Korean speech audiometry which was defined as the reference speech recognition threshold level (RSRTL) equivalent to 0 dB HL at the audiometer. Study sample: Subjects consisted of 20 adults (40 ears) with normal hearing sensitivity. Design: Puretone thresholds (PTs) were obtained in 2 dB steps at each octave band. The newly developed Korean bisyllabic words were used to establish the speech recognition thresholds (SRTs). The SRT was the level at 50% correct responses based on the psychometric function performed from -8 dB HL (12 dB SPL) up to the level at or above 90% correct responses in 2 dB steps. Results Conclusions: The mean SRT was 23.44 dB SPL for sets comprised of 36 Korean bisyllabic words. Thus, the difference between English and Korean RSRTLs was about 3.44 dB. We recommend further study to recalculate the RSRTL for Korean speech audiometry with more subjects. Sumario Objetivo: El propósito de este estudio fue examinar el nivel de presión sonora de referencia (RSPL) para la logoaudiometría en coreano, que fue definido como el nivel umbral de referencia para el reconocimiento del lenguaje (RSRTL), equivalente a 0 dB HL en el audiómetro. Muestra Del Estudio: Los sujetos de estudio fueron 20 adultos (40 oídos) con sensibilidad auditiva normal. Diseño: Se obtuvieron umbrales tonales puros (PT) en pasos de 2 dB para cada banda de octava. Se usaron las recientemente desarrolladas palabras bisilábicas coreanas para establecer los umbrales de reconocimiento del lenguaje (SRT). El SRT fue el nivel donde se obtuvo un 50% de respuestas correctas, con base en la función psicométrica realizada desde −8 dB HL (12 dB SPL) hasta un nivel ubicado donde se logra un 90% o mayor de respuestas correctas, en pasos de 2 dB. Resultados Y Conclusiones: La mediana del SRT fue de 23.44 dB SPL para listas de 36 palabras bisilábicas coreanas. Por tanto, la diferencia entre el SRT en coreano y en inglés fue de 3.44 dB. Recomendamos estudios adicionales para recalcular el RSRTL para la logoaudiometría en coreano con más sujetos.

Development of School Aged and Preschool Korean Bisyllabic Word Lists for Speech Recognition Threshold Test

SooJin Cho, JungHak Lee, Dukhwan Lim, KyungWon Lee and HeeKyung Han Department of Speech Pathology & Audiology, Daebul University, Yeongam, Korea Department of Audiology, Hallym Institute of Advanced International Studies, Seoul, Korea Division of Audiology and Speech Pathology, Hallym University, Chuncheon, Korea Inter-Disciplinary Program of Speech Pathology & Audiology, Graduate School, Hallym University, Chuncheon, Korea

A Review of Evidence-Based Practice in the Audiological Field

Evidence-based practice (EBP) is defined as an approach in which current, best research evidence is integrated with clinical expertise and client’s preferences or values into the process of making clinical decisions. It has been widely applied in various fields such as medicine, nursing, social welfare, counseling, and education. The purpose of this paper is to improve the awareness and to recognize the possibility for clinical application of EBP in the audiological field in Korea. Therefore, this paper deals with reviews of the EBP definition, 5 steps of the process (defining a clinical question, searching for evidence to address the question, evaluating the available evidence, relating the evidence to the client, and evaluating the outcomes of the EBP process), and the limitation and activation plans for EBP. Conclusively, it requires ongoing education and discussion that can lead to the change in the perception of the audiologists to successfully apply EBP in the field of audiology

Comparison of the Uncomfortable Loudness Level withthe Acoustic Reflex Threshold in Normal Children and Adults

Comparison of the Uncomfortable Loudness Level with the Acoustic Reflex Threshold in Normal Children and Adults Ha Na Hong, Soojin Cho and Bin Na Hong Department of Oriental Medical Materials Processing, College of Life Sciences, Kyung Hee University, Kyunggi, Korea Department of Speech-Language Pathology & Audiology, Nambu University, Gwangju, Korea It has been well known that the selection of maximum power output in hearing aids fitting is important. In general, it was determined through the uncomfortable loudness level (UCL) test. The purpose of this study was to measure and compare the UCL and acoustic reflex threshold (ART) in young normal children and adults for early intervention and aural rehabilitation, including hearing aids fitting for hearing-impaired children. Pure tone hearing threshold, UCL and ART were measured in 40 ears of children and adults with normal hearing respectively. In results, UCL was higher than ART by 8.9 dB in children and was similar to ART in adults. And UCL, dynamic range (DR) and ART of children was higher than that of adults by 12.0 dB and 3.6 dB. In conclusion, we would suggest to monitor environmental noises properly and thoroughly for childrens hearing based on the our results.

A Study on the Usage of Assistive Listening Devices (ALDs) and Counseling Activities for Hearing-Impaired Students

A Study on the Usage of Assistive Listening Devices (ALDs) and Counseling Activities for Hearing-Impaired Students Hyekyong Kim, Sohyun Cho and Soojin Cho Department of Speech Pathology & Audiology, Graduate School of Public Health, Daebul University, Yeongam, Korea Department of Speech Pathology & Audiology, Daebul University, Yeongam, Korea This study was designed to obtain basic data for appropriate improvement plans by surveying and analysing the usage of assistive listening devices (ALDs) and counseling activities of students in hearing impaired schools. A total of 102 students were participated in this study from seven hearing impaired schools. The results of this study are summarized as follows. First, it is showed that most of the responded students (86.3%) weared ALDs (hearing aids, 68.8% and cochlear implants, 21.1%) and among the 88 students 21 students used two kinds of ALDs. Second, most students (75%) were influenced by their ‘parent’ and ‘teacher’ when they took ALDs. As merits in use of ALDs, the students selected ‘able to communicate well with other people’(33.5%) and ‘able to listen to what they want to listen (19.9%)’. Third, high school students were the most worried about ‘for admission to a school of higher grade or their future paths (44.8%)’ while ‘their hearing impairments (28.6%)’ ranked number one as middle school students’ biggest worry. Lastly, 90.2% of students responded that they have ever experienced to receive counseling for their problems, however, 55 students (53.9%) responded that there were no counseling offices and 79 (84.3%) said that there were no professional counseling teachers in their schools. In conclusion, for the activation of counseling activities, it needs to make sufficiently students understand and support institutionally the installation of counseling offices and placement of professional counseling teachers.

Auditory Performance Before and After Cochlear Implantation in School-Aged Children

Auditory Performance Before and After Cochlear Implantation in School-Aged Children Yeongran Seo and Soojin Cho Kyeong Shin Aural Rehabilitation Center, Daegu, Korea Department of Speech Pathology & Audiology, Daebul University, Yeongam, Korea The present study examined auditory performance before and after cochlear implantation in three school-aged children with hearing and listening tests in order to investigate factors affecting auditory performance after cochlear implantation and the importance of auditory rehabilitation. After cochlear implantation, subject 1 had better auditory performance than subjects 1 and 2 to some extent afterwards. In particular listening tests of one syllable (36%) and two syllables (52%) with auditory-only (AO) word tests for subject 1 were better than subject 2 (16%, 24%) and subject 3 (24%, 8%) respectively. The reasons for good auditory performance in subject 1 were as follows. Subject 1 already had good auditory performance before cochlear implantation, and had received aural rehabilitation for a longer period (4 years six months) than subjects 2 and 3 (2 years eight and ten months). The age of cochlear implantation in subject 1 was earlier than subject 2 and subject 3. The results of this study suggested that school-aged children with cochlear implants should receive auditory rehabilitation including auditory training continuously in order to train their residual hearing and adjust themselves to the cochlear implant. and psycho-social counseling and hearing-related information should be provided to their families, friends and teachers.

The Role of Audiologists in Educational Settings-Audiologic Services

The Role of Audiologists in Educational Settings-Audiologic Services Hyunsook Jang, Soo-Jin Cho, Dukhwan Lim and So-Hyun Cho Section of Audiology, Audiology & Speech Pathology Research Institute, Hallym University, Chuncheon, Korea Department of Speech Pathology & Audiology, Daebul University, Yeongam, Korea Recently, a new law for the impaired was passed in the national assembly and the details on related services were yet to be defined in specific regulations and controls (Act 28). Audiologic service has been one of the important categories and prospective beneficiaries should have access to this service through programs based on the new system. In this paper, authors, together with national association of professors in audiology, tried to provide related parties and government with practical information, data, and guidelines to cover the key educational issues that typically were involved with the hearing impaired children in educational situations.

A Study on the Usefulness of Two-Channel OAE System

A Study on the Usefulness of Two-Channel OAE System Soo-Jin Cho, So-Hyun Cho and Eun-Gyu Lee Department of Speech Pathology & Audiology, Faculty of Nursing, Welfare & Therapy, Speech Pathology & Audiology, Graduate School of Public Health, Daebul University, Yeongam, Korea It is now generally accepted that otoacoustic emission (OAE) was an objective and non-invasive test for the functional exploration of active micro-mechanical characteristics of outer hair cells. And OAE has been widely used as a tool for hearing screening test. So the purpose of this study was to evaluate of the usefulness of two-channel OAE system as a hearing screening test. Transientevokedotoacoustic emission (TEOAE) and distortion product otoacoustic emission (DPOAE) were measured in each ear of eighteen adults (11 males;7 females) with normal hearing with ILO v6 two-channel OAE system. Results as followed. TEOAE and DPOAE amplitudes with unilateral stimulation were larger than with bilateral stimulation except for DPOAE amplitudes of the right ear. But there were not the significant difference for unilateral and bilateral stimulations as a whole. Therefore this study showed that two-channel OAE system will be usefully applied as a hearing screening test.

Effects of Stimulus Type on Auditory Steady-State Responses

Effects of Stimulus Type on Auditory Steady-State Responses Soo-Jin Cho, 1 Jung-Hak Lee 2 and So-Hyun Cho 1 Department of Speech Pathology & Audiology, Faculty of Nursing, Welfare & Therapy, Daebul University, Yeongam, Korea Department of Otolaryngology, College of Medicine, Hallym University, Chuncheon, Korea The purpose of this study was to find out effects of stimulus type on auditory steady-state responses (ASSRs). So we evaluated ASSR amplitudes, thresholds and differences between ASSR and pure tone thresholds according to the stimulus type for the normal hearing group. Thirty adults (15 males;15 females) participated in this study. ASSRs were obtained using MASTER system (version 2.01) at carrier frequencies of 500, 1000, 2000, 4000 Hz with modulation frequencies 82-99 Hz and stimuli were AM (amplitude modulation), AM, AM/FM (mixed modulation, MM), AM/FM tones with 30 and 50 dBHL. Results were as follows. Firstly ASSR amplitudes increased orderly AM, AM, AM/FM, AM/FM tones at 30 and 50 dBHL except for 500 Hz. And ASSR amplitudes with 50 dBHL were significantly larger than those with 30 dBHL. Secondly, ASSR thresholds and differences between ASSR and pure tone thresholds were decreased orderly AM, AM, AM/FM, AM/FM tones. These data suggested that ASSR with AM/ FM or AM/FM tone can be used more efficiently than ASSR with AM or AM tone.

Effects of Contralateral Stimulus on the Transient Evoked Otoacoustic Emissions in Normal Hearing

Effects of Contralateral Stimulus on the Transient Evoked Otoacoustic Emissions in Normal Hearing Soo-Jin Cho, So-Hyun Cho and Mi-Jung Choi Department of Speech Pathology & Audiology, Department of Public Health Graduate School, Daebul University, Yeongam, Korea During measurements of transient evoked otoacoustic emission (TEOAE), acoustic stimulation of the contralateral ear reduces or suppresses TEOAE amplitude. This is thought to be due to the inhibitory control that the medial olivo-cochlear bundle (MOCB) exerts on the outer hair cell function. The purpose of this study was to investigate effects of contralateral stimulus on TEOAE. Contralateral suppression of TEOAE using four types of stimulus was measured in 30 young adults (30 ears) with normal hearing at 30, 40, 50 dBSPL. Contralateral stimuli were broad band noise (BBN), narrow band noise (NBN), amplitude modulation (AM) and frequency modulation (FM). This study showed that TEOAE suppression using contralateral noises increased orderly AM, FM, NBN and BBN at 40 and 50 dBSPL. Except for BBN, there was no significant difference between NBN, AM and FM. And as contralateral noise levels from 30 dBSPL to 50 dBSPL increase, TEOAE suppression also increased. But there was no the effect of gender. These results indicated that OAE represented a means of functional exploration of the active micro-mechanical properties of OHCs and our study was meaningful in the light of indicating amplitude fluctuation and frequency bandwidth effects in MOCB activation.