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coding for correct answers with key press

raynae — Mon, 23 Jan 2023 18:13:42 GMT

Hello,

I'm looking for help on how to code for /iscorrectresponse.

In my study I prefer for participants to respond using a keyboard press which corresponds to the location of the stimulus. e.g, "1" for left and "2" for right.

However, I want to randomise the presentation of the stimulus location of which I'm doing using a counter. Is there a way to code for if the position is 40% then the correct response == "1" keypress but if position is 60% then correct response == "2" keypress

thank you

RE: coding for correct answers with key press

raynae — Mon, 23 Jan 2023 18:13:42 GMT

Thank you!

RE: coding for correct answers with key press

Dave — Mon, 23 Jan 2023 17:11:33 GMT

+x[quote]

[b]raynae - 1/23/2023[/b]
Hello,

I'm looking for help on how to code for /iscorrectresponse.

In my study I prefer for participants to respond using a keyboard press which corresponds to the location of the stimulus. e.g, "1" for left and "2" for right.

However, I want to randomise the presentation of the stimulus location of which I'm doing using a counter. Is there a way to code for if the position is 40% then the correct response == "1" keypress but if position is 60% then correct response == "2" keypress

thank you
[/quote]

Sure.

[code]<values>
/ x = 0%
/ cresp = " "
</values>

<list xpos>
/ items = (40%, 60%)
/ poolsize = 4
</list>

<text stimulus>
/ items = ("A", "B", "C", "D")
/ hposition = values.x
</text>

<trial mytrial>
/ ontrialbegin = [
    values.x = list.xpos.nextvalue;
    if (values.x == 40%) {
        values.cresp = "1";
    } else {
        values.cresp = "2";
    }
]
/ stimulusframes = [1=stimulus]
/ validresponse = ("1", "2")
/ correctresponse = (values.cresp)
</trial>

<block myblock>
/ trials = [1-4 = mytrial]
</block>

[/code]