Hi,
I am a bit stuck in coding an evaluative conditioning task. I have 120 CS and 100 US. I would like the participant to first rate the 120 CS on a scale from 1 to 7 (unpleasant-->pleasant), then for the script to select the 20 more "neutral" stimuli, that is the one closest to the overall mean for the participant, and then use them for the evaluative conditioning task. I came up with this script :
<item csAPic>
/ 1 = "CFD-LM-204-001-N.jpg"
/ 2 = "CFD-LM-208-110-N.jpg"
/ 3 = "CFD-LM-244-068-N.jpg"
/ 4 = "CFD-WF-001-003-N.jpg"
/ 5 = "CFD-WF-002-004-N.jpg"
/ 6 = "CFD-WF-003-003-N.jpg"
...
/ 60="CFD-WM-011-002-N.jpg"
</item>
<item csBPic>
/ 1 = "CFD-WM-013-001-N.jpg"
/ 2 = "CFD-WM-014-002-N.jpg"
/ 3 = "CFD-WM-015-002-N.jpg"
/ 4 = "CFD-WM-016-001-N.jpg"
.../ 60="CFD-WM-258-125-N.jpg"
</item><picture csAPic>
/ items = csAPic
/ erase = false
</picture>
<picture csBPic>
/ items = csBPic
/ erase = false
</picture>
<trial_csAPic>
/ stimulusframes = [1=noreplace(csAPic)]
/ responseframe = 61
/ response = timeout(3000)
/ validresponse = ("q", "s", "d", "f", "g", "h", "j", "k", "l", ";", "'")
</trial>
<trial_csBPic>
/ stimulusframes = [1=noreplace(csBPic )]
/ responseframe = 61
/ response = timeout(3000)
/ validresponse = ("q", "s", "d", "f", "g", "h", "j", "k", "l", ";", "'")
</trial>
<block pretestA>
/ stimulusframes =[1-60=noreplace(csApic,csApic,csApic,csApic,csApic,csApic,csApic, csApic, csApic, csApic, csApic,csApic,csApic,csApic,csApic,csApic,csApic, csApic, csApic, csApic,csApic,csApic,csApic,csApic,csApic,csApic,csApic, csApic, csApic, csApic,csApic,csApic,csApic,csApic,csApic,csApic,csApic, csApic,
csApic, csApic,csApic,csApic,csApic,csApic,csApic,csApic,csApic, csApic, csApic, csApic,csApic,csApic,csApic,csApic,csApic,csApic,csApic, csApic, csApic, csApic )]
/ onblockend = [values.simplemean = round(block.pic_pretestA.mean)]]
</block>
<block pretestB>
/ stimulusframes =[1-60=noreplace(csBpic, csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic, csBpic, csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic, csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,
csBpic, csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic, csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic, csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic,csBpic, )]
/ onblockend = [values.simplemeanB = round(block.pic_pretestB.mean)]]
</block>
but I can't find a function that allows to compute the mean, then select stimuli according to this mean (like 1 standard deviation, or minus/plus 1 point around it). Also, I would like the script to select one US for each CS, and then present both of them 5 time (10CS with negative USs and 10 with positive USs).
Trials for the EC tasks would looks like this :
<trial AAPic>
/ ontrialbegin = [values.simplemeanA = values.testtrialcounter +/- 1
]
/ stimulustimes = [0=erase, 1=noreplace (csAPic, ucAPic)]
/ trialduration = parameters.exposureDuration
/ validresponse = (" ")
/ branch = [if (parameters.ITI > 0) trial.ITI]
</trial>
<trial BBPic>
/ ontrialbegin = [
values.simplemeanB = values.testtrialcounter +/- 1
]
/ stimulustimes = [0=erase, 1=noreplace (csBPic, ucbPic)]
/ trialduration = parameters.exposureDuration
/ validresponse = (" ")
/ branch = [if (parameters.ITI > 0) trial.ITI]
</trial>
<trial BAPic>
/ ontrialbegin = [
values.simplemeanB = values.testtrialcounter +/- 1
]
/ stimulustimes = [0=erase, 1=noreplace (csBPic, ucAPic)]
/ trialduration = parameters.exposureDuration
/ validresponse = (" ")
/ branch = [if (parameters.ITI > 0) trial.ITI]
</trial>
<trial ABPic>
/ ontrialbegin = [
values.simplemeanA = values.testtrialcounter +/- 1
]
/ stimulustimes = [0=erase, 1=noreplace (csAPic, ucbPic)]
/ trialduration = parameters.exposureDuration
/ validresponse = (" ")
/ branch = [if (parameters.ITI > 0) trial.ITI]
</trial>
Thanks in advance for the help :/ I'm a bit stuck