An Analysis of Speech Disfluencies of Turkish Speakers Based on Age Variable.

The focus of this research is to verify the influence of the age variable on fluent Turkish native speakers' production of the various types of speech disfluencies. To accomplish this, four groups of native speakers of Turkish between ages 4-8, 18-23, 33-50 years respectively and those over 50-year-olds were constructed. A total of 84 participants took part in this study. Prepared and unprepared speech samples of at least 300 words were collected from each participant via face-to-face interviews that were tape recorded and transcribed; for practical reasons, only the unprepared speech samples were collected from children. As a result, for the prepared speech situation, there was no statistically significant difference in terms of age in the production rates of filled gaps, false starts, slips of the tongue and repetitions; however, participants in the over 50-year-old group produced more hesitations and prolongations than participants in the 18-23 and 33-50-year-old groups. For the unprepared speech situation, age variable was not effective on the production rates of filled gaps. However, 4-8 and over 50-year-old participants produced more hesitations and prolongations than the 18-23 and 33-50-year-old groups. 4-8-year-old children produced more slips of the tongue than the 18-23 and 33-50-year-old groups, and more false starts and repetitions than the participants in the other three age groups (18-23, 33-50, over 50). Further analyses revealed more extensive insights related to the types of disfluencies, the position of disfluencies, and the linguistic units involved in disfluency production in Turkish speech.