Millisecond Forums

I'm working on a simple program in which a stimulus number is presented and participants must enter that number in an open-ended trial. I'm assessing latency, correct responses, and (hopefully) corrected errors. A corrected error occurs when a submission would have been incorrect if the participant hadn't backspace-d to correct the error.

However, I can't figure out a script to assess corrected errors. I need something like:

<openended>
/ stimulusframes = [1=350]
/ validresponse = (anyresponse)
/ correctresponse = (350)
/ iscorrectederror = [openended.response includes a backspace && openended.response == 350]
\\ obviously, iscorrectederror is a made-up attribute \\
</openended>

In other words, I need a line of script that will give me a data output if the response included a backspace AND was a correct response, because that would be a corrected error.

Thanks in advance for your collective help!