To specify good variables for representing the perception and production boundaries between Japanese single and geminate stops at various speaking rates, regression analysis and discriminant analysis were conducted for perception data and production data, respectively. The regression function of the closure duration with the word duration with an intercept term predicted the perception boundary between a single and a geminate stop very well (R2=.892), and also discriminated the production of stops with a small error rate (8.73%). At the same time, a discriminant function with the same variables discriminated the production of stops with a small error rate (8.72%), and also predicted their perception boundary very well (R2=.815). In addition, the regression and discriminant functions were very similar. These results suggest that the closure and word durations with an intercept term are good variables for representing the perception and production boundaries of single and geminate stops irrespective of speaking rate, and that these two boundaries coincide with these variables.
Bibliographic reference. Amano, Shigeaki / Hirata, Yukari (2008): "Correspondence of perception and production boundaries between single and geminate stops in Japanese", In INTERSPEECH-2008, 2869-2872.