Hi Dave,
I have a question concerning control of timing. I have read this:
http://www.millisecond.com/support/docs/v5/html/howto/howtocontroltiming.htm. However, I still have questions.
I have only two trials (containing two stimuli) that I would like to be randomly displayed in one block (12 times, replace and repeat). I do not want the participants to respond to anything. One trial should look like this:
Stimulus 1 (1500ms), ISI (100ms), Stimulus 2 (1500ms). Between two trials, I would like to have an ITI of 1500ms.
The second trial should look accordingly but with different stimuli.
Are the pre- and the posttrialpause attributes, what actually gives me the ITI, so do I have to split it on the two? I know, the ISI is controlled by the stimulustimes, but it never seems to works properly. I think, I probably could work with the parameters, but I do not really understand, how.
Further, the block only seems to work, if I use noreplace, which I don't want...
<trial OWpos>
/ stimulustimes = [1000= picture.FocalOW; 1100= picture.USpos]
/ validresponse = (noresponse)
/ posttrialpause = 500
/ trialduration = 4600
</trial>
<trial YMneg>
/ stimulusframes = [1000 = picture.FocalYM; 1100 = picture.USneg]
/ validresponse = (noresponse)
/ posttrialpause = 500
/ trialduration = 4600
</trial>
<block all>
/ trials = [1-12= noreplace(OWpos, YMneg)]
</block>
Thank you very much in advance,
M.