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is it possible to collect mouse responses in which clicking the left key is different from clicking the right key? (rather than just clicking in general)
You could use the mouse_response item. This will create a variable called 'response' (similar to the keyboard_response item). The value for this variable is 1 if the left button is pressed, or 3 when the right button is pressed.
Does that help?
Ah, yes, I didn't know they were already differentiated. So I should fill either 1 and 3 at the correct response section whenever I want participants to click respectively either left or right?
I think it's most convenient if you define the correct responses (i.e., 1 or 3) in your block loop, and not in the mouse_response item. So:
You can find a working example experiment here (simply download and "save as" with the extension ".opensesame"):