OS : Windows 10
PsychoPy version: 3.2
I am trying to check the consistency of key press detection between .log file and .csv file using Builder.
To do so, I created a simple experiment (see picture) where I just display a letter using a Text component (to display the letters) and a Keyboard Component (to log key presses).
Then, when I run the experiment, I press a key every time a character is displayed with the intention of inspecting the ‘rt’ in the .csv file generated after the experiment is run.
I was expecting this ‘rt’ value in the .csv to be exactly the same as the response time computed from the -log file (Keypress time - autoDraw time), however this is not the case. There is always a difference between 1 to 8~9 ms, as you can check in the following image.
I would like to know why these two values do not match.