Data recording - stimulus position


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Psych_Josh
Psych_Josh
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Dear Inquisit forum,

I have a quick query regarding stimulus positions. I understand that providing multiple sets of 

/columns = [stimulusnumber, stimulusitem, stimulusvpos, stimulushpos, stimulusonset, etc...]

gives you multiples of these columns per number of stimuli within the script, however for my current study I require the difference in both h and v positions of two stimuli (e.g., values.h_difference = stimulushpos1 - stimulushpos2) - however, obviously this does not work, presumably because stimlushpos1/2 are not predefined. Is there a way to calculate the difference between these two on a trial-by-trial basis?

Many thanks,
Josh
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