This study analyzes two spectral properties in vowel segments, H1-H2 (related to glottal opening) and H1-A3 (related to the speed of vocal fold closing gesture) in an attempt to infer the voice quality variation associated with different types of paralinguistic information (PI) types. Results suggest that both glottal opening and closing speed of the glottis differ significantly depending on PI. However, for some PI types there were also significant syllable effects. The correlation between F0 and these two voice parameters was very low leading to the conclusion that just F0 differences cannot account for the observed voice quality variation. Significant differences were also noted for the power of speech waveform (RMS) according to PI. Inter-speaker variation was noted especially for ‘suspicion’.