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After reading a text, the participant answer a question of understanding.
I don't know why but the participant must press the button twice for the answer to be taken into account.
Can you help me please?
This is because you're asking for two key presses. First, as a part of response_training, which has a 'keypress' duration. And then again, as part of keyboard_repsonse_training. The solution would be to set the duration of the response_training to 0. See also: