بررسي تاثير واكداري بر شاخص هاي فضاي توليد هم خوان ها

Effect of voicing on spacial indices of consonants

Background and Aim: For better using of electropalatography in assessment and treatment procedures it is important to know normal tongue to palate contact patterns. Several factors can change consonant’s articulatory patterns. One of them is voicing. In addition to determine amount of spacial indices of studied consonants, this research aimed to study tongue behavior related to change in voicing. Materials and Methods: This is a descriptive analytic study. Consonant linguapalatal contacts were studied using reading electropalatography by recording 4 normal Persian speaking adults (aged between 21-25) repeating CVCV syllables (C=/s,z,t,d/, V=/a/) ten times. Contact patterns were examined for total number of electrodes contacted and other spatial indices. Comparisons were made across voicing contrast. Results: In this study amount of spacial indices of studied consonants determined. It’s found that there was not significant difference between voiced and voiceless cognate according to number of contact and other special indices. Conclusion: The findings of this study are in according with previous studies in other languages about the effect of voicing upon linguapalatal contact patterns. Difference in voicing does not make clear change in spacial indices related to tongue contact pattern. Compared to other parts, Tip of the tongue seem to be more sensitive for change in voicing and oral air pressure.