UMAR create a change in perceived frequency.

UMAR Impact on Formants:

Changes in the shape of the vocal tract, including alterations due to uvula movement, can affect the frequency of the formants, which are the resonant frequencies that give vowels their distinctive quality. 

UMAR Impact on Perceived Pitch:

While the fundamental frequency (the basic pitch of the voice) might not be significantly altered by uvula movement, changes in the formants can lead to a perception of a different pitch or tone.