Abstract
The objective of the study was to examine the effects of stimulus duration on vowel perception in normal-hearing and hearing-impaired children. For this purpose, 80 semisynthetic vowel stimuli consisting of eight different Turkish vowels with ten different durations were presented to 14 normal-hearing and 15 hearing impaired children, and they were asked to identify the vowel they heard. Thirteen normal-hearing adults served as speaker subjects to get normative data on mean durations of the Turkish vowels. While there was no significant effect of duration on perception in normal-hearing children, perception errors for very short and very long vowels were observed in hearing-impaired children. The most frequent responses as a function of duration showed four different patterns: (1) three vowels were perceived correctly in all durations; (2) two were perceived correctly in middle and longer durations; (3) two were perceived correctly in middle duration; and (4) only one was perceived correctly in short duration. It was concluded that the effects of stimulus duration on vowel perception were determined by natural duration of the vowel in a given language, and unnaturally short and long vowels were misperceived by hearing impaired subjects.SumarioEl objetivo del estudio fue examinar el efecto de la duración del estimulo en la percepción de las vocales en niños normoyentes e hipoacúsicos. Para ello, 80 estímulos vocálicos semisintéticos consistentes en ocho diferentes vocales turcas, con 10 duraciones diferentes, fueron presentados a 14 niños normoyentes y 15 hipoacúsicos; se les pidió que identificaran la vocal escuchada. Trece adultos normoyentes sirvieron como hablantes para obtener datos normativos sobre el promedio de duración de las vocales turcas. Aunque que no hubo efecto significativo de la duración en la percepción en los normoyentes, se observaron errores de percepción para vocales muy cortas y muy largas en los hipoacúsicos. Las respuestas más frecuentes en función de la duración presentaron cuatro patrones diferentes: (1) tres vocales fueron percibidas correctamente con todas las duraciones, (2) dos fueron percibidas correctamente con duración media y prolongada, (3) dos fueron percibidas correctamente con duración media y (4) sólo una fue percibida correctamente con duración corta. Se concluyó que los efectos de la duración del estimulo en la percepción de las vocales se determinan por la duración natural de la vocal en una lengua dada y las vocales artificialmente cortas y largas son percibidas erróneamente por los sujetos hipoacúsicos.
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