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      Comparação dos estímulos clique e CE-chirp® no registro do Potencial Evocado Auditivo de Tronco Encefálico Translated title: Comparison of click and CE-chirp® stimuli on Brainstem Auditory Evoked Potential recording

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          Abstract

          OBJETIVO: Comparar as latências e as amplitudes da onda V no registro do Potencial Evocado Auditivo de Tronco Encefálico (PEATE) com os estímulos clique e CE-chirp® e a presença ou ausência das ondas I, III e V em fortes intensidades. MÉTODOS: Estudo transversal com 12 adultos com limiares audiométricos <15 dBNA (24 orelhas) e idade média de 27 anos. Os parâmetros utilizados para o registro com os dois estímulos nas intensidades de 80, 60, 40, 20 dBnNA foram polaridade alternada e taxa de repetição de 27,1 Hz. RESULTADOS: As latências da onda V observadas com CE-chirp® foram maiores que as observadas com o clique nas intensidades fracas (20 e 40 dBnNA). Já nas intensidades fortes (60 e 80 dBnNA), o oposto ocorreu. Maiores amplitudes foram observadas com o CE-chirp® em todas as intensidades, exceto em 80 dBnNA. CONCLUSÃO: O CE-chirp® apresentou latências mais curtas que as observadas com o clique em fortes intensidades e maiores amplitudes em todas as intensidades, exceto em 80 dBnNA. As ondas I e III tenderam a desaparecer quando o estímulo CE-chirp® foi utilizado.

          Translated abstract

          PURPOSE: To compare the latencies and amplitudes of wave V on the Brainstem Auditory Evoked Potential (BAEP) recording obtained with click and CE-chirp® stimuli and the presence or absence of waves I, III and V in high intensities. METHODS: Cross-sectional study with 12 adults with audiometric thresholds <15 dBHL (24 ears) and mean age of 27 years. The parameters used for the recording with both stimuli in intensities of 80, 60, 40, 20 dBnHL were alternate polarity and repetition rate of 27.1 Hz. RESULTS: The CE-chirp® latencies for wave V were longer than click latencies at low intensity levels (20 and 40 dBnHL). At high intensity levels (60 and 80 dBnHL), the opposite occurred. Larger wave V amplitudes were observed with CE-chirp® in all intensity levels, except at 80 dBnHL. CONCLUSION: The CE-chirp® showed shorter latencies than those observed with clicks at high intensity levels and larger amplitudes at all intensity levels, except at 80 dBnHL. The waves I and III tended to disappear with CE-chirp® stimulation.

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          A direct approach for the design of chirp stimuli used for the recording of auditory brainstem responses.

          A recent study evaluates auditory brainstem responses (ABRs) evoked by chirps of different durations (sweeping rates) [Elberling et al. (2010). J. Acoust. Soc. Am. 128, 215-223]. The study demonstrates that shorter chirps are most efficient at higher levels of stimulation whereas longer chirps are most efficient at lower levels. Mechanisms other than the traveling wave delay, in particular, upward spread of excitation and changes in cochlear-neural delay with level, are suggested to be responsible for these findings. As a consequence, delay models based on estimates of the traveling wave delay are insufficient for the design of chirp stimuli, and another delay model based on a direct approach is therefore proposed. The direct approach uses ABR-latencies from normal-hearing subjects in response to octave-band chirps over a wide range of levels. The octave-band chirps are constructed by decomposing a broad-band chirp, and constitute a subset of the chirp. The delay compensations of the proposed model are similar to those found in the previous experimental study, which thus verifies the results of the proposed model.
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            Quality Estimation of Averaged Auditory Brainstem Responses

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              New efficient stimuli for evoking frequency-specific auditory steady-state responses.

              ASSR is a promising tool for the objective frequency-specific assessment of hearing thresholds in children. The stimulus generally used for ASSR recording (single amplitude-modulated carrier) only activates a small area on the basilar membrane. Therefore, the response amplitude is low. A stimulus with a broader frequency spectrum can be composed by adding several cosines whose frequency intervals comply with the desired stimulus repetition rate. Compensation of the travelling wave delay on the basilar membrane is possible with a stimulus of this type. Through this, a better synchronization of the neural response can be obtained and, as a result, higher response amplitudes can be expected, particularly for low-frequency stimuli. The additional introduction of a frequency offset enables the use of a q-sample test for the response detection, especially important at 500 Hz. The results of investigations carried out on a large group of normally hearing test subjects have confirmed the efficiency of this stimulus design. The new stimuli lead to significantly improved ASSRs with higher SNRs and thus higher detection rates and shorter detection times.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                rsbf
                Revista da Sociedade Brasileira de Fonoaudiologia
                Rev. soc. bras. fonoaudiol.
                Sociedade Brasileira de Fonoaudiologia (São Paulo )
                1982-0232
                December 2012
                : 17
                : 4
                : 412-416
                Affiliations
                [1 ] Pontifícia Universidade Católica de São Paulo Brazil
                [2 ] Pontifícia Universidade Católica de São Paulo Brazil
                Article
                S1516-80342012000400008
                10.1590/S1516-80342012000400008
                db7ef550-29e7-4e47-9d3e-879116337117

                http://creativecommons.org/licenses/by/4.0/

                History
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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1516-8034&lng=en
                Categories
                AUDIOLOGY & SPEECH-LANGUAGE PATHOLOGY
                REHABILITATION

                Audiology,Physiotherapy
                Evoked potentials, auditory,Evoked potentials, auditory, brain stem,Electrophysiology,Hearing,Hearing tests,Potenciais evocados auditivos,Potenciais evocados auditivos do tronco encefálico,Eletrofisiologia,Audição,Testes auditivos

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