F₀ contour. The staring-point of the upward F₀ transition occurs within the formant transition between the first and the the second syllables. The duration of the upward F₀ transition measured from the starting-point is 133ms in VV，and 127ms in VCV. The upward F₀ transition does not occur in the syllabic vowel，but mainly occurs on the voiced consonantal initial or the zero-initial of the second syllable，and the nasal coda or vocalic ending of the first one. Therefore it is not perceived，and so is the downward F₀ transition.

In VCV and VV with falling-convex tones in the Fuzhou dialect，the amplitude of the speech waves in the second syllable is often the greatest in the vicinity of the peak of the convex F₀ contour. The starting-point of the rising part of F₀ synchronizes with the second syllable. The durations of the rising part of F₀ in the second syllable is 167ms in VCV，and 140ms in VV. The rising F₀ part occurs not only on the voiced consonatal initial or zero-initial，but also on the syllabic vowel of the second syllable. Thus the rising F₀ part in the second syllable is perceived.

We have discussed that the theory about the tonal perception in speech propounded by D. House（1990）cannot account for why the upward F₀ transition in falling-falling tones of Standard Chinese is not perceived and why the rising F₀ part in falling-convex tones of Fuzhou is perceived.