Detection efficiency of auditory steady state evoked by modulated noise

Santos, Thamara Suzi dos; Silva, J.J.; Lins, Otávio Gomes; Melges, Danilo Barbosa; Tierra-Criollo, Carlos Júlio

doi:10.1016/j.heares.2016.05.017

Cited by 11 publications

(6 citation statements)

References 28 publications

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“…John et al (2003), for instance, used noise with bandwidth from 1 to 8 kHz. Santos et al (2016) measured ASSR to three noise stimuli: two low-pass filtered noise stimuli with cutoff frequencies of 2 and 8 kHz and noise bandpass filtered from 2 to 8 kHz. In contrast, we investigated the effect of noise stimuli with much smaller bandwidths, thereby maintaining a frequency-specific assessment of the hearing.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Stimulus Bandwidth on the Auditory Steady-State Response in Scalp- and Ear-EEG

Sergeeva,

Bech Christensen,

Kidmose

2024

Ear &Amp; Hearing

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Objectives: The auditory steady-state response (ASSR) enables hearing threshold estimation based on electroencephalography (EEG) recordings. The choice of stimulus type has an impact on both the detectability and the frequency specificity of the ASSR. Amplitude modulated pure tones provide the most frequency-specific ASSR, but responses to pure tones are weak. The ASSR can be enhanced by increasing the bandwidth of the stimulus, but this comes at the cost of a decrease in the frequency specificity of the measured response. The objective of the present study is to investigate the relationship between stimulus bandwidth and ASSR amplitude. Design: The amplitude of ASSR was measured for five types of stimuli: 1 kHz pure tone and band-pass noise with 1/3, 1/2, 1, and 2 octave bandwidths centered at 1 kHz. All stimuli were amplitude modulated with a 40 Hz sinusoid. Responses to all stimulus types were measured at 30, 40, and 50 dB SL. ASSRs were measured concurrently using both conventional scalp-EEG and ear-EEG. Results: Stimulus bandwidth and sound intensity were both found to have a significant effect on the ASSR amplitude for scalp- and ear-EEG recordings. In scalp-EEG ASSRs to all bandwidth stimuli were found to be significantly larger than ASSRs to pure tone at low sound intensity. At higher sound intensities, however, significantly larger responses were only obtained for 1- and 2-octave bandwidth stimuli. In ear-EEG, only the ASSR to 2 octave bandwidth stimulus was significantly larger than the ASSR to amplitude modulated pure tones. Conclusions: At low presentation levels, even small increases in stimulus bandwidth (1/3 and 1/2 octave) improve the detectability of ASSR in scalp-EEG with little or no impact on the frequency specificity. In comparison, a larger increase in stimulus bandwidth was needed to improve the ASSR detectability in the ear-EEG recordings.

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Section: Discussionmentioning

confidence: 99%

“…Several studies have investigated the effect of stimulus bandwidth on the ASSR (John et al 1998(John et al , 2003Purcell et al 2004;Santos et al 2016). However, these studies used broadband stimuli (1 to 8 or 1 to 2 kHz) at relatively high presentation levels (55 to 70 dB SPL).…”

Section: Introductionmentioning

confidence: 99%

Effect of Stimulus Bandwidth on the Auditory Steady-State Response in Scalp- and Ear-EEG

Sergeeva,

Bech Christensen,

Kidmose

2024

Ear &Amp; Hearing

View full text Add to dashboard Cite

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“…Modifications of the spectral composition and the amplitude envelopes of these standard stimuli have been proposed for optimizing the detection of ASSR [27, 66, 67]. Such modifications include the implementation of mixed amplitude and frequency modulated tones [68, 69], AM-tones with exponential envelopes [70, 71] and AM-noise [72]. Different physiological mechanisms underlie the increase in the ASSR amplitude resulting from the presentation of those “alternative” acoustic stimuli and that obtained by implementing a discrete stimulation mode.…”

Section: Discussionmentioning

confidence: 99%

Estimation of auditory steady-state responses based on the averaging of independent EEG epochs

et al. 2019

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The amplitude of auditory steady-state responses (ASSRs) generated in the brainstem of rats exponentially decreases over the sequential averaging of EEG epochs. This behavior is partially due to the adaptation of the ASSR induced by the continuous and monotonous stimulation. In this study, we analyzed the potential clinical relevance of the ASSR adaptation. ASSR were elicited in eight anesthetized adult rats by 8-kHz tones, modulated in amplitude at 115 Hz. We called independent epochs to those EEG epochs acquired with sufficiently long inter-stimulus interval, so the ASSR contained in any given epoch is not affected by the previous stimulation. We tested whether the detection of ASSRs is improved when the response is computed by averaging independent EEG epochs, containing only unadapted auditory responses. The improvements in the ASSR detection obtained with standard, weighted and sorted averaging were compared. In the absence of artifacts, when the ASSR was elicited by continuous acoustic stimulation, the computation of the ASSR amplitude relied upon the averaging method. While the adaptive behavior of the ASSR was still evident after the weighting of epochs, the sorted averaging resulted in under-estimations of the ASSR amplitude. In the absence of artifacts, the ASSR amplitudes computed by averaging independent epochs did not depend on the averaging procedure. Averaging independent epochs resulted in higher ASSR amplitudes and halved the number of EEG epochs needed to be acquired to achieve the maximum detection rate of the ASSR. Acquisition protocols based on averaging independent EEG epochs, in combination with appropriate averaging methods for artifact reduction might contribute to develop more accurate hearing assessments based on ASSRs.

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“…Neste estudo foi utilizada a técnica de ORD Magnitude quadrática da Coerência (MSC) para a identificação da ASSR (Dobie and Wilson, 1989). A MSC foi escolhida pelo fato de apresentar o melhor desempenho em relação as demais técnicas de ORD na identificação da ASSR (Dobie and Wilson, 1993;Dobie and Wilson, 1994;Stürzebecher et al, 2001;Santos et al, 2016;Wianda and Ross, 2016).…”

Section: Magnitude Quadrática Da Coerência (Msc)unclassified

Ajuste do Nível de Significância Associado ao Número de Detecções Consecutivas Aplicada a Detecção de Respostas Auditivas em Regime Permanente

Bazoni

Zanotelli

Floriano

et al. 2021

Procedings Do XV Simpósio Brasileiro De Automação Inteligente

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The strategy for sequential tests is an option to identify the Auditory Steady-State Responses (ASSRs) faster when compared to the single test. However, the repetitive application of objective response detectors (ORD) increases the probability of detecting a response when it does not exist, i.e., false positive (FP). A solution to this increase in FP is to define the response as present when it reaches a predetermined number of consecutive detections (NDC). However, the NDC can lead to a more conservative exam, which can lead to loss of detection rates. In this work, a method for adjusting the significance level associated with the NDC was proposed, with the objective of maintaining the FP rate of the exam equal to the desired significance level. The proposed method was applied to the EEG signal set composed of 11 volunteers for intensities of 50, 40 and 30 dB SPL. The results demonstrate that the proposed adjustment kept the FP rate of the exam around the desired significance level of 5%. In addition, it obtained a percentage increase in detection rates of 9.68%, 21.23% and 33.20% for the intensities of 50, 40 and 30 dB SPL respectively, as well as a reduction in the examination time when compared to the strategy without the proposed adjustment.Resumo: A estratégia para testes sequenciais constituem uma opção de identificação das Respostas Auditivas em Regime Permanente (ASSRs) de maneira mais rápida quando comparada com o teste único. Contudo a aplicação de maneira repetitiva dos detectores de resposta objetiva (ORD) aumenta a probabilidade de detectar uma resposta quando não existe, i.e, falso positivo (FP). Uma solução para esse aumento no FP consiste em definir a resposta como presente quando atingir um número de detecções consecutivas (NDC) pré-determinado. Entretanto o NDC pode conduzir a um exame mais conservador, e por consequência pode levar a perdas nas taxas de detecção. Nesse trabalho foi proposto um método para o ajuste do nível de significância associado ao NDC com o objetivo de manter a taxa de FP do exame igual ao nível de significância desejado. O método proposto foi aplicado a um banco de sinais de EEG composto por 11 voluntários para as intensidades de 50, 40 e 30 dB SPL. Os resultados demonstram que o ajuste proposto manteve a taxa de FP do exame em torno do nível significância desejado de 5%. Além disso, obteve um aumento percentual nas taxas de detecção de 9,68%, 21,23% e 33,20% para as intensidades de 50, 40 e 30 dB SPL respectivamente, bem como redução no tempo de exame quando comparada a estratégia sem o ajuste proposto.

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Detection efficiency of auditory steady state evoked by modulated noise

Cited by 11 publications

References 28 publications

Effect of Stimulus Bandwidth on the Auditory Steady-State Response in Scalp- and Ear-EEG

Effect of Stimulus Bandwidth on the Auditory Steady-State Response in Scalp- and Ear-EEG

Estimation of auditory steady-state responses based on the averaging of independent EEG epochs

Ajuste do Nível de Significância Associado ao Número de Detecções Consecutivas Aplicada a Detecção de Respostas Auditivas em Regime Permanente

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