Millisecond Forums

Define a /responsemessage for "no response" that shows a blank stimulus:

<block alcohol>
/ trials = [1-10 = alcohol]
</block>

<picture alcohol>
/ items = ("1L_1.jpg","1L_2.jpg","1L_3.jpg","1L_4.jpg","1L_5.jpg","1L_6.jpg","1L_7.jpg","1L_8.jpg","1L_9.jpg","1L_10.jpg")
/ select = replacenorepeat
/ size = (80%, 80%)
</picture>

<trial alcohol>
/ stimulusframes = [1=alcohol, alc_categories1, alc_categories2]
/ validresponse = (32, 37)
/ iscorrectresponse = [(text.alc_categories2.hposition==20% && trial.alcohol.response==32) || (text.alc_categories2.hposition==80% && trial.alcohol.response==37)]
/ errormessage = (alc_categories1_clicked, 500)
/ correctmessage = (alc_categories2_clicked, 500)
/ responsemessage = (0, blankscreen, 500)
/ timeout = 5000
</trial>

<shape blankscreen>
/ shape = rectangle
/ color = white
/ size = (100%, 100%)
</shape>


<text alc_categories1>
/ items = ("Non-alcoholic beverage","Food","Non-food object")
/ select = replace
/ vposition = 50%
/ hposition = counter.type1pos.selectedvalue
/ txcolor = black
</text>

<text alc_categories2>
/ items = ("Alcoholic beverage")
/ vposition = 50%
/ hposition = counter.type2pos.selectedvalue
/ txcolor = black
</text>

<text alc_categories1_clicked>
/ items = ("Non-alcoholic beverage","Food","Non-food object")
/ select = text.alc_categories1.currentindex
/ vposition = 50%
/ hposition = text.alc_categories1.hposition
/ txcolor = red
</text>

<text alc_categories2_clicked>
/ items = ("Alcoholic beverage")
/ vposition = 50%
/ hposition = text.alc_categories2.hposition
/ txcolor = red
</text>

<counter type1pos>
/ items = (20%,80%)
/ select = noreplace
</counter>

<counter type2pos>
/ items = (20%,80%)
/ not = (type1pos)
/ select = noreplace
</counter>

Hi Dave,

Last question I hope!
The script works perfectly. The only thing I noticed is that the errormessage (text turns a different color) will also logically appear if the participant gives no response at all. Is there a way for me to make it so that if no response is given, the trial just moves forward to the next in the block without showing the errormessage?

You beat me to it, I'll take a look at all of that. Thanks, Dave :)

Are there any other posts/documents I can look to for understanding how to best set up this logic? Would it be something like:
/ iscorrectresponse = [if (text.alc_alc.hposition == 20%) trial.alcohol.correct == "Z"; if (text.alc_alc.hposition == 80%) trial.alcohol.correct == "/"] ???

And then in the data file, is there a way for me to record what the key corresponded to? Or should I just have all the stimulusitem columns and then a correct column and figure it out myself?

In short, you do (example uses the D and K keys on the keyboard)

<block alcohol>
/ trials = [1-10 = alcohol]
</block>

<picture alcohol>
/ items = ("1L_1.jpg","1L_2.jpg","1L_3.jpg","1L_4.jpg","1L_5.jpg","1L_6.jpg","1L_7.jpg","1L_8.jpg","1L_9.jpg","1L_10.jpg")
/ select = replacenorepeat
/ size = (80%, 80%)
</picture>

<trial alcohol>
/ stimulusframes = [1=alcohol, alc_categories1, alc_categories2]
/ validresponse = (32, 37)
/ iscorrectresponse = [(text.alc_categories2.hposition==20% && trial.alcohol.response==32) || (text.alc_categories2.hposition==80% && trial.alcohol.response==37)]
/ errormessage = (alc_categories1_clicked, 500)
/ correctmessage = (alc_categories2_clicked, 500)
</trial>

<text alc_categories1>
/ items = ("Non-alcoholic beverage","Food","Non-food object")
/ select = replace
/ vposition = 50%
/ hposition = counter.type1pos.selectedvalue
/ txcolor = black
</text>

<text alc_categories2>
/ items = ("Alcoholic beverage")
/ vposition = 50%
/ hposition = counter.type2pos.selectedvalue
/ txcolor = black
</text>

<text alc_categories1_clicked>
/ items = ("Non-alcoholic beverage","Food","Non-food object")
/ select = text.alc_categories1.currentindex
/ vposition = 50%
/ hposition = text.alc_categories1.hposition
/ txcolor = red
</text>

<text alc_categories2_clicked>
/ items = ("Alcoholic beverage")
/ vposition = 50%
/ hposition = text.alc_categories2.hposition
/ txcolor = red
</text>

<counter type1pos>
/ items = (20%,80%)
/ select = noreplace
</counter>

<counter type2pos>
/ items = (20%,80%)
/ not = (type1pos)
/ select = noreplace
</counter>

or something similar. You can find lots of examples using /isvalid- and /iscorrectresponse on the forum or in the scripts available in the library if you want to delve in deeper.

Correct. You need to apply conditional logic via the <trial>'s /iscorrectresponse attribute. You'll then also want to use /correctmessage and /errormessage instead of /responsemessage.

I should also add that if I just have the characters as responses, it'll be somewhat hard for me to understand the data at the end. Hopefully there's a way around that too.

Hi again, Dave -

I have a new question involving the same task as troubleshot above.

Basically, I'd like to maintain the paradigm but instead of clicking, I'd like to assign the Z and / keys on the keyboard to mean left and right, respectively.

My issue is that because the hpositions are randomized, I don't know how to properly assign the "correctresponse" characters, or the "responsemessage" characters. I imagine I need some sort of conditional logic, or I need some way to associate a key with an hposition? I'm really not sure. The script is exactly the same as above because I haven't touched it/am not sure where to begin.

Thanks in advance.

Amazing, thanks as always. Works like a charm now.

Change that counter's selectionrate to trial

<counter type2pos>
/ items = (20%,80%)
/ not = (type1pos)
/ select = noreplace
/ selectionrate = always
/ selectionrate = trial
</counter>

There's no reason to have it set to always.