Getting error message in trial

Jakob — Mon, 01 Feb 2016 03:58:11 GMT

Hi

In my experiment I would like it if, when a participant reponds incorrectly, an error message appears under my stimulus. The only thing I cannot figure out is how to make the message appear without my stimulus itself disappearring immediatly. Ideally I want something like this:
Stimulus appears -> if response = wrong -> stimulus + error message for 250 ms -> ITI -> next trial
-> if response = right -> ITI -> next trial
See underneath for part of my code. This only gets me the error message for 250 ms after a wrong response but my stimulus disappears. Is there any way to fix this? :

<text wrong>
/ font = ("Arial", -50, 700, 0, 34)
/ numitems = 1
/ items = ("WRONG")
/ color = (255, 0, 0)
/ position = (50, 70)
</text>

<text Stimulus_Target>
/ numitems = 6
/ items = targetlist
/ select = noreplace
</text>

<trial TARGET>
/ inputdevice = keyboard
/ validresponse = ("a", "l")
/ correctresponse = ("a")
/ stimulustimes = [0 = Stimulus_Target; 800 = slow; 1050 = slowerase]
/ responsetime = 0
/ timeout = 1500
/ responsemessage = ("l", wrong, 250)
/ posttrialpause= noreplace(500, 800, 1000)
</trial>

Thanks in advance for any advice :)

RE: Getting error message in trial

Dave — Mon, 01 Feb 2016 03:58:11 GMT

For it to remain on-screen, you need to set /erase=false for

<text Stimulus_Target>
/ numitems = 6
/ items = targetlist
/ select = noreplace
/ erase = false
</text>

For your ITI then, you need to set up and run a separate <trial>.

<trial ITI>
/ stimulusframes = [1=blankscreen]
/ validresponse = (0)
/ trialduration = noreplace(500, 800, 1000)
</trial>

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

with

<trial TARGET>
/ inputdevice = keyboard
/ validresponse = ("a", "l")
/ correctresponse = ("a")
/ stimulustimes = [0 = Stimulus_Target; 800 = slow; 1050 = slowerase]
/ responsetime = 0
/ timeout = 1500
/ responsemessage = ("l", wrong, 250)
/ branch = [trial.iti]
</trial>

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Getting error message in trial

RE: Getting error message in trial