Two participants using one keyboard for response

[Sheila Bouten]

Hi, 

I have two participants in my experiment using one keyboard to respond to a 
memory task. For example, if they are shown an image they have seen before, 
the participant on the left would press "Q" while the participant on the 
right would press "N". If they hadn't seen the image before, the 
participant on the left would press "W" while the participant on the right 
would press "M". My problem is that my code makes it such that if one 
participant accidentally presses one key twice, their response is recorded 
twice and the other participant's response is not recorded. This data is 
thrown out. Is there some code to prevent this by recording only one 
keystroke from each half of the keyboard? 

Thanks for your help!

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