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How to get voice reaction time?

Hello~
I designed an oral production experiment by Psychopy, but the voice key is so sensitive that the time recorded is inaccurate. So, I’m trying to use Praat additionally to get the RT. However, I’m not sure what indicator I should utilize, the time of first pitch value? Or the first time of intensity which is more than 50dB? Could you please give me some suggestions? Thanks a lot!