Auditory steady-state evoked potential in newborns

Abstract

Steady-state evoked potential responses were recorded from 337 normal full-term sleeping newborns to combined amplitude and frequency modulated tones. Responses were automatically detected by statistical analysis of the response phase. Responses were most easily and consistently recorded at carrier frequencies of 500 Hz, 1500 Hz and 4000 Hz when the modulation frequency was between 60 Hz and 100 Hz. In this modulation frequency range, the response latencies were found to be between 11 ms and 15 ms, depending on carrier frequency, and the mean response thresholds for the three carrier frequencies were found to be 41.36 dB HL, 24.41 dB HL and 34.51 dB HL respectively. The results of this study suggest that steady-state evoked potentials at modulation rates in excess of 60 Hz may be useful for frequency specific, automated hearing screening in newborns.

Correlação do potencial evocado auditivo de estado estável com outros achados em audiologia pediátrica

“…Entretanto, a modulação entre 80 e 110Hz sofre menos influência do sono e da maturação neurológica, mostrando-se mais eficiente na avaliação de crianças e neonatos, podendo fornecer informações de porções baixas da via auditiva central, como o PEATE (Aoyagi et al, 1994;Rickards et al, 1994).…”

“…Assim como o PEATE, o PEAEE realizado com a modulação em torno de 80 e 100Hz gera respostas provenientes de estruturas do tronco encefálico, que podem ser evocadas por uma modulação de amplitude e de frequência (Rickards e Clark, 1984 (Rickards et al, 1994;Lins et al, 1996).…”

Hearing Aid Method by Equalizing Frequency Response of Phoneme Extracted from Human Voice

“…Auditory Steady-State Response: ASSR [12] allows to measure frequency response of human ear objectively (Galambos et al (1981) [13], Rickards et al (1994) [14], Kuwada et al (1986) [15]). During sleep, frequency response can be measured using ASSR.…”

Reply to: “M. Delaroche, R. Thiebaut, R. Dauman, Behavioural audiometry: protocols for measuring hearing thresholds in babies aged 4–18 months” [Int. J. Pediatr. Otorhinolaryngol. 68 (2004) 1233–1243]

“…less than six months) stating that threshold determination over the normal audiometric frequencies is not possible using these techniques. Contrary to this, there is a significant body of evidence suggesting that Auditory Brainstem Response (ABR) testing using low and high frequency tone bursts [1,2,3,4] delivered through air conduction and bone conduction transducers [5,6,7,8,9] and Auditory Steady State Responses [10,11,12,13,14,15,16] are capable of providing accurate, ear and frequency specific and time efficient threshold data across the audiometric frequencies (i.e. 0.5, 1, 2 and 4 kHz) as well as determining the nature of the hearing impairment.…”