RESUMEN
This study evaluated the use of multiple auditory steady-state responses (ASSRs) to estimate the growth of loudness in listeners with normal hearing. Individual intensity functions were obtained from measures of loudness growth using the contour test and from the electrophysiological amplitude measures of multiple amplitude-modulated (77-105 Hz) tones (500, 1000, 2000, and 4000 Hz) simultaneously presented to both ears and recorded over the scalp. Slope analyses for the behavioural and electrophysiological intensity functions were separately performed. Response amplitudes of the ASSRs and loudness sensation judgements increase as the stimulus intensity increases for the four frequencies studied. A significant relationship was obtained between loudness and the ASSRs. The results of this study suggest that the amplitude of the ASSRs may be used to estimate loudness growth at least for individuals with normal hearing.
Asunto(s)
Percepción Auditiva , Percepción Sonora , Estimulación Acústica , Adulto , Audiometría de Respuesta Evocada , Umbral Auditivo , Electroencefalografía , Potenciales Evocados Auditivos , Femenino , Humanos , Masculino , Modelos Psicológicos , Proyectos Piloto , Psicoacústica , Valores de ReferenciaRESUMEN
In this study we present a case of a 71-year-old female patient with sensorineural hearing loss and fitted with bilateral hearing aids. The patient complained of scant benefit from the hearing aid fitting with difficulties in understanding speech with background noise. The otolaryngology examination was normal. Audiological tests revealed bilateral sensorineural hearing loss with threshold values of 51 and 50 dB HL in the right and left ear. The Dichotic Digit Test was administered in a divided attention mode and focalizing the attention to each ear. Results in this test are consistent with a Central Auditory Processing Disorder.
Asunto(s)
Pruebas de Audición Dicótica , Pérdida Auditiva Sensorineural/diagnóstico , Anciano , Femenino , HumanosRESUMEN
INTRODUCTION: Binaural integration is the ability to process different messages when presented simultaneously in both ears. Any deficit in this mechanism implies poor auditory discrimination of background noise and difficulties in processing competing auditory signals. METHOD: In the present study, pairs of digits were presented dichotically to both ears in adult subjects with normal hearing and bilaterally symmetrical sensorineural cochlear hearing loss. RESULTS: Hearing sensitivity, the difficulty in hearing the pairs and the effect of aging determine the capacity for correct recognition. In general, subjects with normal hearing score higher than those with hearing loss. Hypoacusic subjects show a deficit in the recognition of digits presented to the left ear and a greater advantage in the right ear. CONCLUSIONS: The study of binaural integration mechanisms may be useful in the audiological evaluation of patients who reject bilateral amplification and in normal- hearing subjects presenting difficulties to understand speech in noisy settings.