A pilot study on the acoustic effects of a pseudo-palatal plate on speech: Implications for articulatory rehabilitation devices
Fig 4
(A) Spectrograms visualizing the formant structures and second formant (F2) slope for the consonants/tʃ/,/τ−Σ tΣ’/, and/ tΣh/, before (left) and after (right) wearing the palatal plate.
(B) Box plots comparing F2 slope comparisons across three articulation types: plain, tense, and aspirated. A nonparametric Friedman’s test revealed a significant main effect (p < .001), and post-hoc pairwise comparisons were conducted using the Bonferroni correction. (C) Box plots comparing F2 slope between normal and plate conditions for each articulation manner. No statistically significant difference was found based on the Wilcoxon signed-rank test (p > .05 for all comparisons).