Response accuracy unreliable because {SHIFT} logged as response

[HFAC]

Hello all,

Thank you for your advice in advance. To introduce myself, I use EPrime to 
develop my experiments because I have no experience coding (a shame I 
know), so please keep that in mind when responding. So far, I have only 
used the built in functions of EPrime. 

*My Experiment*: I have developed an experiment where participants see a 
stimuli and participants are expected to answer using a series of (capital) 
X, I, V, or -, +, and =. (For example: X=V+I) The participants have 2 
minutes to come up with correct answer and they may try as many answers as 
they would like until they find the correct one. I have set the experiment 
up where if the participant enters an answer and it is incorrect they 
cannot continue but if they enter the correct response they will receive 
feedback that they are correct and can continue to the next puzzle. 

*My Problem*: I cannot get Eprime to recognize the correct response (for 
example: X=V+I) because when participants capitalize their responses EPrime 
records {SHIFT}. I have tried making the correct response 
{SHIFT}X{=}{SHIFT}V{+}{SHIFT}I. This method is not reliable because 
participants hit shift a variable number of times (when making mistakes, 
etc.) so there is no way for me to predict the number of shifts in their 
answer. 

Please let me know if you need additional information in order to help me.

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