Millisecond Forums

Try using the resetstimulusframes() function instead, which restores the <trial>'s original state (i.e., before the picture was injected into the stimulus presentation sequence):

<block myblock>
/ onblockbegin = [trial.mytrial.insertstimulusframe(text.mytext,300); ]
/ trials = [1-2=mytrial]
</block>

<trial mytrial>
/ ontrialend = [trial.mytrial.resetstimulusframes(); ]
/ validresponse = (57)
</trial>

<text mytext>
/ items = ("GO")
</text>

Hi Dave,

Thank you for the prompt reply. I only have to remove the last stimulus, i need the rest to remain as they are and so resetstimulusframes() won't work for me.
Is there anything else i can do to remove just this one stimulus?

Thank you,
Konstantina

Depends on how you've set up the trial and the other stimuli it displays. If you have

<trial mytrial>
/ stimulusframes = [1=a; 100=b; 200=c]
...
</trial>

with

/ onblockbegin = [trial.mytrial.insertstimulusframe(text.mytext,300); ]

then

/ ontrialend = [trial.mytrial.resetstimulusframes(); ]

will effectively only remove that single injected stimulus, while the rest remains intact.

Alternatively, you can force the beginsresponseframe or -time property to the desired value in addition to removing the frame:

<block myblock>
/ onblockbegin = [trial.mytrial.insertstimulusframe(text.mytext,300); ]
/ trials = [1-2=mytrial]
</block>

<trial mytrial>
/ ontrialend = [trial.mytrial.removestimulusframe(300); trial.mytrial.beginresponseframe=1; ]
/ validresponse = (57)
</trial>

<text mytext>
/ items = ("GO")
</text>

Thanks a lot Dave! beginresponseframe did it!