Alpha and Low Gamma Embedded With White Noise Binaural Beats Modulating Working Memory among Malaysian Young Adult: A Preliminary fMRI Study

@#Introduction: Binaural beats (BB) provisions alpha and gamma have been suggested to modulate working memory (WM), while white noise (WN) acted as a control condition. Methods: The current study overlays WN on alpha and gamma tones to study its modulating role on WM performance. A block-design n-back task paradigm used to determine the effect of load on embedded BB on WM performance using functional magnetic resonance imaging. Results: Six young adults (3 males and 3 females) with mean age of 23.5 ± 0.84 within the Kota Bharu vicinity participated in the study. A repeated-measures ANOVA (p<0.05) on response accuracy indicate medium effect size on condition (η2 =0.420), and large effect sizes on groups (η2 = 0.388) and load (η2 = 0.487). The potential practical difference is more evident on low- (0-back) and high-load (3-back). GWN provision marginally excels, implying its entrainment may benefit WM processing. A repeated-measures ANOVA (p<0.05) on reaction time (RT) implied a large effect size on all variables (condition: η2 =0.065, groups: η2 =0.227 and load: η2 =0.169). It was observed that BB exposure elicits a slow processing speed which worsens RT. The neural correlates suggest activated regions in GWN and AWN are associated with attentional mechanisms and WM processes. Conclusion: Preliminary findings indicate both embedded BB has a potential to improve WM performance with the cost of slower processing speed. GWN provision modulates attentional mechanisms benefiting WM performance and AWN may enhance performance in extreme ends of WM load.

Efecto placebo y estimulación sonora binaural de ondas beta y theta en el rendimiento de una tarea de memoria de trabajo / Placebo Effect and Binaural Sound Stimulation of Beta Wave and Theta Wave in a Working Memory Task Performance

Resumen En el presente trabajo se realizó un estudio cuasi experimental de medidas repetidas con grupos caso y control, cuyo objetivo fue medir el efecto de los sonidos binaurales de onda beta y theta, y de la información placebo relacionada a ellos, sobre el rendimiento de una tarea de memoria de trabajo computarizada, versión libre del Automated Operation Span Task -AOSPAN-de Unsworth, Heitz, Schrock y Engle (2005). Dicha tarea se repitió en dos sesiones separadas por un lapso mínimo de dos semanas, una de las cuales se resolvía mientras se escuchaba una estimulación sonora binaural de onda beta o theta que, dependiendo del grupo, se acompañaba o no de información placebo. Se evaluaron 98 personas con distinto nivel de escolaridad divididas en seis grupos experimentales y uno de control. Se encontraron diferencias significativas en el tiempo de presentación de la tarea experimental asociada a información placebo, mostrando una mejoría en la segunda aplicación de la tarea. Debido a ambigüedades en los resultados, a pesar de encontrar diferencias significativas asociadas a la estimulación binaural de onda beta, no pudieron establecerse relaciones concretas entre la mejoría en el recuerdo de conjuntos de hasta cuatro elementos con la presencia de dicha variable. No se encontraron diferencias significativas en las variables de recuerdo global, lo cual puede explicarse por el tipo de tarea de memoria utilizado.

Abstract In this work, a quasi-experimental study of repeated measures with case and control groups was carried out, whose objective was to measure the effect of binaural sounds of beta and theta waves, and the placebo informa tion related to them, on the performance of a computerized working memory task, Automated Operation Span Task -AOSPAN- free version of Unsworth, Heitz, Schrock and Engle (2005). This task was repeated in two sessions separated by an interval of two weeks, one of which was resolved while listening to a binaural sound stimulation of beta wave or theta that, depending on the group, was supported or not by placebo information. 98 people with different levels of schooling were tested twice, divided into six experimental groups and one control group. Significant differences were found related to time duration in performing the experimental task associated with placebo information; it was showed an improvement the second time the task was administered. Due to ambiguities in the results, despite finding significant differences associated with binaural stimulation of beta wave, it was not possible to establish concrete relations between the improvement in the memory of sets up four elements with the presence of this variable. No significant differences were found in the global recall variables, which can be explained by the type of memory task performed.

Gender differences in binaural speech-evoked auditory brainstem response: are they clinically significant? / Diferenças de gênero no potencial evocado auditivo de tronco encefálico com estímulo de fala binaural: são clinicamente significantes?

Abstract Introduction: Binaurally evoked auditory evoked potentials have good diagnostic values when testing subjects with central auditory deficits. The literature on speech-evoked auditory brainstem response evoked by binaural stimulation is in fact limited. Gender disparities in speech-evoked auditory brainstem response results have been consistently noted but the magnitude of gender difference has not been reported. Objective: The present study aimed to compare the magnitude of gender difference in speech-evoked auditory brainstem response results between monaural and binaural stimulations. Methods: A total of 34 healthy Asian adults aged 19-30 years participated in this comparative study. Eighteen of them were females (mean age = 23.6 ± 2.3 years) and the remaining sixteen were males (mean age = 22.0 ± 2.3 years). For each subject, speech-evoked auditory brainstem response was recorded with the synthesized syllable /da/ presented monaurally and binaurally. Results: While latencies were not affected (p > 0.05), the binaural stimulation produced statistically higher speech-evoked auditory brainstem response amplitudes than the monaural stimulation (p < 0.05). As revealed by large effect sizes (d > 0.80), substantive gender differences were noted in most of speech-evoked auditory brainstem response peaks for both stimulation modes. Conclusion: The magnitude of gender difference between the two stimulation modes revealed some distinct patterns. Based on these clinically significant results, gender-specific normative data are highly recommended when using speech-evoked auditory brainstem response for clinical and future applications. The preliminary normative data provided in the present study can serve as the reference for future studies on this test among Asian adults.

Resumo Introdução: Potenciais auditivos evocados de modo binaural apresentam bons valores diagnósticos ao testar indivíduos com déficits auditivos centrais. A literatura sobre a resposta do potencial evocado do tronco encefálico com estímulo de fala de modo binaural é, de fato, limitada. As diferenças de gênero nos resultados desse exame têm sido consistentemente observadas, mas a magnitude da diferença de gênero ainda não foi relatada. Objetivo: Comparar a magnitude da diferença de gênero nos resultados do potencial evocado do tronco encefálico com estímulo de fala entre estímulos monaural e binaural. Método: Um total de 34 adultos asiáticos saudáveis com idades entre 19 e 30 anos participaram deste estudo comparativo. Dezoito deles eram do sexo feminino (média de idade = 23,6 ± 2,3 anos) e os outros dezesseis do sexo masculino (média de idade = 22,0 ± 2,3 anos). Para cada indivíduo, o potencial evocado do tronco encefálico com estímulo de fala foi registrado com a sílaba sintetizada /da/ apresentada de forma monaural e binaural. Resultados: Embora as latências não tenham sido afetadas (p > 0,05), a estimulação binaural produziu amplitudes de potencial evocado do tronco encefálico com estímulo de fala estatisticamente maiores do que a estimulação monaural (p < 0,05). Como demonstrado pelos grandes tamanhos de efeito (d > 0,80), diferenças substanciais de gênero foram observadas na maioria dos picos de potencial evocado do tronco encefálico com estímulo de fala para ambos os modos de estímulo. Conclusão: A magnitude da diferença de gênero entre os dois modos de estímulo revelou alguns padrões distintos. Com base nesses resultados clinicamente significantes, os dados normativos específicos para o gênero são altamente recomendados quando se usa o potencial evocado do tronco encefálico com estímulo de fala para aplicações clínicas e futuras. Os dados normativos preliminares fornecidos pelo presente estudo podem servir como referência para futuros estudos sobre esse exame em asiáticos adultos.

The effects of binaural beats stimulation compared to classical music on the memory of senior high school students: A randomized controlled trial / The Health Sciences Journal

INTRODUCTION@#Several studies have suggested that music has a significant effect on memory. Classical music has been studied extensively. However, there are studies on other types of music like binaural beats which involve the introduction of tones of different frequencies. This study aimed to determine the effects of binaural beats stimulation compared to classical music on memory among high school students.@*METHODS@#This was a randomized single-blind controlled trial among senior high school students in a selected private school assigned to listen to either binaural beats stimulation or classical music to determine their effect on memory as measured by the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS). Pre- and post-intervention RBANS scores were compared within and between the two study groups.@*RESULTS@#RBANS scores in both classical music and binaural beats stimulation groups improved with an increase of 20.58 ± 10.33 and 20.26 ± 12.06, respectively. The difference between the increase in scores was not significant.@*CONCLUSION@#Exposure to either binaural beats stimulation or classical music provided statistically and clinically significant increases in memory. Binaural beats stimulation increased memory to the same degree as classical music.

Agreement between human voice (“Baah”) Test and Otoacoustic Emissions in Screening of infants for Binaural Hearing Loss

@#<p style="text-align: justify;"><strong>OBJECTIVE:</strong> To determine the agreement between Otoacoustic Emission and "Baah" tests for detecting binaural hearing loss in infants referred for hearing evaluation in a local community setting.<br /><strong>METHOD:</strong> This is a retrospective review done in a Private Community-based Secondary Specialty Hospital. Bilateral hearing test results of 788 neonates and infants obtained between September 2011 and January 2013 using human voice "BAAH" test and OAE were reviewed from January 2014 to September 2015.<br /><strong>RESULTS:</strong> There were 432 males and 356 females (male: female ratio 1.2:1) with a mean age of 11.17 days (range of 0-143 days). Of the 780 infants with bilateral "Pass" using OAE, all were screened as "with response" by "Baah" tests. Five infants with bilateral "refer" results using OAE yielded "no response" on "Baah" test. Sensitivity of 'Baah' test was 100%, specificity was 99.5%, with positive predictive value of 62.5%, and negative predictive value of 100%. There was good agreement noted between OAE and "Baah" (kappa=.77, p<.001).<br /><strong>CONCLUSION:</strong> The "Baah" test is a possible alternative to OAE in initially detecting binaural hearing loss in areas where equipment and personnel are limited. Although "Baah" test could only detect 62% of infants with binaural hearing loss and could not detect unilateral hearing loss, infants detected with binaural hearing loss can be immediately referred to centers with more sophisticated equipment.</p>

Listening to Sentences in Noise: Revealing Binaural Hearing Challenges in Patients with Schizophrenia

OBJECTIVE: The present, case-control, study investigates binaural hearing performance in schizophrenia patients towards sentences presented in quiet and noise. METHODS: Participants were twenty-one healthy controls and sixteen schizophrenia patients with normal peripheral auditory functions. The binaural hearing was examined in four listening conditions by using the Malay version of hearing in noise test. The syntactically and semantically correct sentences were presented via headphones to the randomly selected subjects. In each condition, the adaptively obtained reception thresholds for speech (RTS) were used to determine RTS noise composite and spatial release from masking. RESULTS: Schizophrenia patients demonstrated significantly higher mean RTS value relative to healthy controls (p=0.018). The large effect size found in three listening conditions, i.e., in quiet (d=1.07), noise right (d=0.88) and noise composite (d=0.90) indicates statistically significant difference between the groups. However, noise front and noise left conditions show medium (d=0.61) and small (d=0.50) effect size respectively. No statistical difference between groups was noted in regards to spatial release from masking on right (p=0.305) and left (p=0.970) ear. CONCLUSION: The present findings suggest an abnormal unilateral auditory processing in central auditory pathway in schizophrenia patients. Future studies to explore the role of binaural and spatial auditory processing were recommended.

Manejo odontológico del paciente con parálisis cerebral infantil por medio de los sonidos binaurales

El objetivo más importante de la investigación fue demostrar la eficacia de los sonidos binaurales en la consulta dental como técnica actual para disminuir la ansiedad de los pacientes con parálisis cerebral infantil, así como comprobar que el entorno odontológico genera temor en los pacientes pediátricos. Por medio de un oxímetro de pulso, un aparato reproductor mp3 y auriculares, se logró cuantificar las pulsaciones cardíacas durante tres momentos a lo largo de la investigación. Se valoraron las historias médicas de cada uno de los niños del Hogar Divina Misericordia, así como los medicamentos que consumen diariamente y las enfermedades asociadas a la parálisis cerebral. Se observaron diversos tipos de reacciones al utilizar cada uno de los sonidos, desde el llanto y enojo hasta conseguir la tranquilidad y alegría en los pacientes. Finalmente los resultados revelan los beneficios y la veracidad de los sonidos binaurales mientras que, por el contrario, se expone a los sonidos del ambiente odontológico como un método distractor y desfavorable durante las visitas dentales.

The most important objective of the research was to demonstrate the efficiency of binaural beats in the dental consultant as a current technique to reduce anxiety in child patients with cerebral palsy, also prove that the dental environment generates fear in pediatric patients. To achieve quantify the heartbeats of the children during three different moments throughout the investigation, we used fingertip pulse oximeter, a mp3 player and headphones. We evaluate the medical histories of each children from Hogar Divina Misericordia, as well the medicines they consume daily and diseases related with cerebral palsy. We observed different types of reactions when using each of the sounds, some cried and got anger until they get relax and happy. Finally the results in this research show the benefits and the veracity of the binaural beats while on the contrary are expose to the sounds of the dental environment as a distracting and unfavorable method during dental visits.

Advantages of Binaural Amplification to Acceptable Noise Level of Directional Hearing Aid Users

OBJECTIVES: The goal of the present study was to examine whether Acceptable Noise Levels (ANLs) would be lower (greater acceptance of noise) in binaural listening than in monaural listening condition and also whether meaningfulness of background speech noise would affect ANLs for directional microphone hearing aid users. In addition, any relationships between the individual binaural benefits on ANLs and the individuals' demographic information were investigated. METHODS: Fourteen hearing aid users (mean age, 64 years) participated for experimental testing. For the ANL calculation, listeners' most comfortable listening levels and background noise level were measured. Using Korean ANL material, ANLs of all participants were evaluated under monaural and binaural amplification with a counterbalanced order. The ANLs were also compared across five types of competing speech noises, consisting of 1- through 8-talker background speech maskers. Seven young normal-hearing listeners (mean age, 27 years) participated for the same measurements as a pilot testing. RESULTS: The results demonstrated that directional hearing aid users accepted more noise (lower ANLs) with binaural amplification than with monaural amplification, regardless of the type of competing speech. When the background speech noise became more meaningful, hearing-impaired listeners accepted less amount of noise (higher ANLs), revealing that ANL is dependent on the intelligibility of the competing speech. The individuals' binaural advantages in ANLs were significantly greater for the listeners with longer experience of hearing aids, yet not related to their age or hearing thresholds. CONCLUSION: Binaural directional microphone processing allowed hearing aid users to accept a greater amount of background noise, which may in turn improve listeners' hearing aid success. Informational masking substantially influenced background noise acceptance. Given a significant association between ANLs and duration of hearing aid usage, ANL measurement can be useful for clinical counseling of binaural hearing aid candidates or unsuccessful users.

An experiment set-up for analysis of lateralization judgments of binaural stimuli

INTRODUCTION: The aim of this work is to present a physical implementation of a noninvasive methodology to analyze the directional sensitivity of human auditory system. A computer controlled experiment set-up has been designed and developed to study the behavior of human subjects under the presentation of interaural time delays and interaural amplitude differences for several sensation levels. METHODS: The proposed methodology comprises: the application of trains of low-pass filtered narrow pulses as acoustic binaural stimuli; the automatic, simultaneous and random variation of interaural time delays and interaural amplitude differences; the absence of human interference along the experimental sessions, except for the decision of the listener under test; the minimization of adaptation effects. RESULTS: Numerous lateralization judgments have been accomplished in order to investigate the transduction mechanism which allows deciding which side of subjects medial plane the source of binaural acoustic stimuli is located in. The behavior of decision time with the order of judgment, the sensation levels and the interaural differences in time and amplitudes has been analyzed. CONCLUSION: The noninvasive, reliable and automatic approach here presented allows obtaining psychophysical responses associated to the neuro-physiological phenomena underneath lateralization capability.

Bilateral Cochlear Implantation for Children in Nagasaki, Japan

OBJECTIVES: The number of patients with bilateral cochlear implant (CI) has gradually increased as patients and/or parents recognize its effectiveness. The purpose of this report is to evaluate the efficacy of 29 bilateral CI out of 169 pediatric CI users, who received auditory-verbal/oral habilitation at our hearing center. METHODS: We evaluated the audiological abilities 29 Japanese children with bilateral CIs including wearing threshold, word recognition score, speech discrimination score at 1 m from front speaker (SP), 1 m from second CI side SP, speech discrimination score under the noise (S/N ratio=80 dB sound pressure level [SPL]/70 dB SPL, 10 dB) at 1 m from front SP, word recognition score under the noise (S/N ratio=80 dB SPL/70 dB SPL, 10 dB) at 1 m from front SP. RESULTS: Binaural hearing using bilateral CI is better than first CI in all speech understanding tests. Especially, there were significant differences between the results of first CI and bilateral CI on SDS at 70 dB SPL (P=0.02), SDS at 1 m from second CI side SP at 60 dB SPL (P=0.02), word recognition score (WRS) at 1 m from second CI side SP at 60 dB SPL (P=0.02), speech discrimination score (SDS) at 1 m from front SP under the noise (S/N=80/70; P=0.01) and WRS at 1 m from front SP under the noise (S/N=80/70; P=0.002). At every age, a second CI is very effective. However, the results of under 9 years old were better than of over 9 years old on the mean SDS under the noise (S/N=80/70) on second CI (P=0.04). About use of a hearing aid (HA) in their opposite side of first CI, on the WRS and SDS under the noise, there were significant differences between the group of over 3 years and the group of under 10 months of HA non user before second CI. CONCLUSION: These results may show important binaural effectiveness such as binaural summation and head shadow effect. Bilateral CI is very useful medical intervention for many children with severe-to-profound hearing loss in Japan as well as elsewhere.

Estimulación bimodal en los pacientes con implante coclear / Bimodal stimulation In patients with Cochlear implant

La audición normal es binaural lo cual permite escuchar apropiadamente en ambientes de ruido, localizar el sonido y maximizar el procesamiento auditivo central en las diferentes etapas del desarrollo cortical en lo períodos críticos y en la vida cotidiana. Hoy en día la gran evolución tecnológica en el campo de los implantes cocleares nos ha permitido implantar pacientes desde el primer año de vida y aún antes en casos seleccionados. Igualmente la implantación coclear bilateral tiene importantes ventajas con todo el respaldo científico. En este artículo presentamos la experiencia del Programa de mplante Coclear de la Fundación Santa Fe de Bogotá en pacientes adultos y niños que utilizan audiífono y un implante coclear en el oído con menores restos auditivos(estimulación bimodal). Presentamos una revisión de la literatura donde se confirman las ventajas de este tipo de estimulación como discriminar mejor en ambientes de ruido, compensar el efecto sombra de la cabeza, mejorar la localización del sonido y mejorar la capacidad de filtra el lenguaje en ruido (efecto squelch, silenciamiento).

Normal hearing is binaural which allows for the adequate hearing ability in noisy environments, the proper perception of sound direction and maximization of the central auditory process in the various cortical development stages, both during critical periods of time and everyday life. The advanced technological evolution in the field of cochlear implants has allowed us to implant patients from their first year of age and even before in some selected cases, nowadays. Also bilateral cochlear implantation offers significant advantages with all the scientific support. In this article we present the experience of the Cochlear Implant Program at Fundación Santa Fe de Bogotá in adult patients and in children that use the hearing aid as well as a cochlear implant in the ear with less residual hearing (bimodal stimulation). We present a literature revision that confirms the advantages of this kind of stimulation such as a better sound discrimination ability in noisy environments, the making up for the shadow effect of the head, the enhancement of the ability to track down sounds and also, the improvement of the in noise language filtering skill (the squelch effect, silencing).

Implante coclear bilateral / Bilateral cochlear implant

Son múltiples los beneficios en la implementación de implantes cocleares bilaterales, como son la localización que puede mejorar hasta en un 95% comparados con la adaptación monoaural, el entendimiento en ambientes ruidosos adicionan hasta el 19% y la inteligibilidad del lenguaje aumenta hasta 6 dB compradas con la implantación unilateral y mejoran, al igual, aspectos en la calidad de vida como la integración en colegios normo oyentes, comunicación telefónica o lenguaje para comunicarse con oyentes no entrenados, existen varias técnicas para la cirugía simultanea (en un mismo procedimiento) o secuencial (en dos intervenciones), los resultados difieren según el tiempo de evolución de la sordera y/o el tiempo trascurrido entre implantes. Sin embargo, existen argumentos válidos que restringen su uso: relación costo-beneficio, futuras tecnologías, riesgos quirúrgicos y consecuencias vestibulares indeterminadas. Este articulo realiza una revisión de la literatura sobre los implantes cocleares bilaterales que pueda ayudar a trazar protocolos futuros.

Implementing bi lateral cochlear implants has numerous benefits. Some of these benefits can be the improvement of the localization skills up to 95% in comparison to the mono aural adaptation, the understanding ability in noisy environments is increased in to 19 % and intelligibility of the language is enhanced up to 6 dB in comparison to the unilateral implant. Also, they improve some of the everyday aspects for quality of life such as being able to integrate into schools with normal hearing skilled students, telephone communication or the language to communicate with audiences that have not been trained. There are several techniques to perform simultaneous surgery (in one single procedure) or sequential surgery (in two different operations), the results may vary according to the type of evolution deafness has and / or the time that has elapsed between implants. However, there some valid arguments that restrict its use: the cost- benefit ratio, future technologies, surgical risks and undetermined vestibular consequences. This article is intended to make a revision on the existing literature on bi lateral cochlear implants that may help layout future protocols.

The Simultaneous Binaural Bithermal Caloric Test / 대한이비인후과학회지

BACKGROUND AND OBJECTIVES: The simultaneous binaural bithermal caloric test is performed by stimulating both ear canals with the water of same temperature at the same time. There are some reports that the simultaneous binaural bithermal caloric test appears to be more sensitive than the alternative bithermal caloric test in detecting caloric vestibular abnormalities. However, it is not well known yet what effect simultaneous binaural bithermal caloric test has on the vestibulo-ocular reflex. We attempted to verify the clinical usefulness of the simultaneous binaural bithermal caloric test. MATERIALS AND METHODS: Otoneurologically normal subjects (n=20) and patients who have complaints of dizziness (n=141) were tested. The regular bithermal caloric test was performed, using Life-Tech water irrigator and the water of temperatures 30degreesC and 44degreesC. The simultaneous binaural bithermal test was performed using Brooker-Grams closed loop irrigator with 27degreesC and 44degreesC water. The irrigation time was 40 seconds and nystagmus was detected for more than 120 seconds by electronystagmography. We divided the test response into six types with the reference value of canal paresis (CP) of the regular bithermal caloric test. RESULTS: The distribution of nystagmus type did not show regular pattern in the normal controls. The distribution of type I and II was 77.4% when CP was more than 25% in patients, 50.6% when CP was less than 25% in patients, and 42.5% in the normal group. The maximal velocity of slow component increased in the unilateral canal paresis patients (CP>25%), compared with the normal controls and no unilateral canal paresis patients (Cp<0.05). CONCLUSION: We observed that the simultaneous binaural bithermal caloric test has advantages of being less time-consuming and more comfortable. When the maximal velocity of slow component is more than 22.6 deg/sec with type I or II response, we could predict canal paresis; however, further studies should be made for abnormal response of simultaneous caloric response on the central nervous ststem.