Dear Inquisiters,
I am programming an experiment during which a sequence of frames are shown creating a brief video.
To control the timing of each frame I used "instertstimulusframes" attribute. This allows me to have the following sequence (with the random time):
First item: first frame
Second item: sound
Third item: second frame
Fourth item: third frame
To control which frame should be selected I used a list (list forward): this ensures that in each trial the same list number is selected, so that I manage to have the correct sequence for each trial (i.e. if first frame is "gln15.jpg", second frame will be "gln13.jpg", third frame will be "gln11.jpg" and so on)
The problem is that all of it works perfectly for the first 24 trials. After the 24th trials, the presentation sequence completely screws up: sometimes it happens that the sound is selected twice, and that the sequence of the frame is completely random (i.e. first item: "gln15.jpg", second item: sound, third item: sound, fourth item: "gln13.jpg").
Do you have any idea of why is this happening? (I also tried to increment the reset interval to 50)
I have 12 types of blocks/trials (I just copied 2 of them for the sake of simplicity, but the structure is always the same, with 4 or 5 frames instead of three)
Hope that someone could help me,
Thank you so much!!
Eleonora
Here is the code :
<list forward>
/ items = [noreplace(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20)]
/ selectionrate = block
/ resetinterval = 1
</list>
<picture safe_minus_third_frame>
/ items = safe_minus_third_frame
/ erase = false
/ size = (100%, 100%)
/ select = list.forward
</picture>
<item safe_minus_third_frame>
/1 = "bon09.jpg"
/2 = "bon10.jpg"
/3 = "bon11.jpg"
/4 = "bon12.jpg"
/5 = "bon13.jpg"
/6 = "gln09.jpg"
/7= "gln10.jpg"
/8 = "gln11.jpg"
/9= "gln12.jpg"
/10 = "gln13.jpg"
/11= "knn09.jpg"
/12= "knn10.jpg"
/13 = "knn11.jpg"
/14= "knn12.jpg"
/15 = "knn13.jpg"
/16= "wgn09.jpg"
/17= "wgn10.jpg"
/18 = "wgn11.jpg"
/19= "wgn12.jpg"
/20 = "wgn13.jpg"
</item>
<picture safe_minus_second_frame>
/ items = safe_minus_second_frame
/ erase = false
/ size = (100%, 100%)
/ select = list.forward
</picture>
<item safe_minus_second_frame>
/1 = "bon11.jpg"
/2 = "bon12.jpg"
/3 = "bon13.jpg"
/4 = "bon14.jpg"
/5 = "bon15.jpg"
/6 = "gln11.jpg"
/7= "gln12.jpg"
/8 = "gln13.jpg"
/9= "gln14.jpg"
/10 = "gln15.jpg"
/11= "knn11.jpg"
/12= "knn12.jpg"
/13 = "knn13.jpg"
/14= "knn14.jpg"
/15 = "knn15.jpg"
/16= "wgn11.jpg"
/17= "wgn12.jpg"
/18 = "wgn13.jpg"
/19= "wgn14.jpg"
/20 = "wgn15.jpg"
</item>
<picture safe_first_frame>
/ items = safe_first_frame
/ erase = false
/ size = (100%, 100%)
/ select = list.forward
</picture>
<item safe_first_frame>
/1 = "bon13.jpg"
/2 = "bon14.jpg"
/3 = "bon15.jpg"
/4 = "bon16.jpg"
/5 = "bon17.jpg"
/6 = "gln13.jpg"
/7= "gln14.jpg"
/8 = "gln15.jpg"
/9= "gln16.jpg"
/10 = "gln17.jpg"
/11= "knn13.jpg"
/12= "knn14.jpg"
/13 = "knn15.jpg"
/14= "knn16.jpg"
/15 = "knn17.jpg"
/16= "wgn13.jpg"
/17= "wgn14.jpg"
/18 = "wgn15.jpg"
/19= "wgn16.jpg"
/20 = "wgn17.jpg"
</item>
<picture safe_plus_second_frame>
/ items = safe_plus_second_frame
/ erase = false
/ select = list.forward
/ size = (100%, 100%)
</picture>
<item safe_plus_second_frame>
/1 = "bon15.jpg"
/2 = "bon16.jpg"
/3 = "bon17.jpg"
/4 = "bon18.jpg"
/5 = "bon19.jpg"
/6 = "gln15.jpg"
/7= "gln16.jpg"
/8 = "gln17.jpg"
/9= "gln18.jpg"
/10 = "gln19.jpg"
/11= "knn15.jpg"
/12= "knn16.jpg"
/13 = "knn17.jpg"
/14= "knn18.jpg"
/15 = "knn19.jpg"
/16= "wgn15.jpg"
/17= "wgn16.jpg"
/18 = "wgn17.jpg"
/19= "wgn18.jpg"
/20 = "wgn19.jpg"
</item>
<picture safe_plus_third_frame>
/ items = safe_plus_third_frame
/ erase = false
/ select = list.forward
/ size = (100%, 100%)
</picture>
<item safe_plus_third_frame>
/1 = "bon17.jpg"
/2 = "bon18.jpg"
/3 = "bon19.jpg"
/4 = "bon20.jpg"
/5 = "bon21.jpg"
/6 = "gln17.jpg"
/7= "gln18.jpg"
/8 = "gln19.jpg"
/9= "gln20.jpg"
/10 = "gln21.jpg"
/11= "knn17.jpg"
/12= "knn18.jpg"
/13 = "knn19.jpg"
/14= "knn20.jpg"
/15 = "knn21.jpg"
/16= "wgn17.jpg"
/17= "wgn18.jpg"
/18 = "wgn19.jpg"
/19= "wgn20.jpg"
/20 = "wgn21.jpg"
</item>
<item safe_w>
/1 = "bonwithouthand.jpg"
/2 = "bonwithouthand.jpg"
/3 = "bonwithouthand.jpg"
/4 = "bonwithouthand.jpg"
/5 = "bonwithouthand.jpg"
/6 = "glnwithouthand.jpg"
/7 = "glnwithouthand.jpg"
/8 = "glnwithouthand.jpg"
/9 = "glnwithouthand.jpg"
/10 = "glnwithouthand.jpg"
/11= "knnwithouthand.jpg"
/12= "knnwithouthand.jpg"
/13 = "knnwithouthand.jpg"
/14= "knnwithouthand.jpg"
/15 = "knnwithouthand.jpg"
/16= "wgnwithouthand.jpg"
/17= "wgnwithouthand.jpg"
/18 = "wgnwithouthand.jpg"
/19= "wgnwithouthand.jpg"
/20 = "wgnwithouthand.jpg"
</item>
<picture safe_w>
/ items = safe_w
/ select = list.forward
/ size = (100%, 100%)
</picture>
<sound take>
/ items = ("illtakeit.wav")
</sound>
<sound leave>
/ items = ("illleaveit.wav")
</sound
<values>
/Actiontype=0
/congruency = 0
/object = 0
/length = 0
/ x=0
/ y=0
/fixate_duration = 0
/time_sound = 0
/time_second_frame = 0
/time_third_frame = 0
/time_fourth_frame = 0
/time_fifth_frame = 0
</values>
<trial fixate>
/ pretrialpause = 1000
/ ontrialbegin = [values.fixate_duration = round(rand(500,1000))]
/ stimulusframes = [1 = cross]
/ trialduration = values.fixate_duration
</trial>
<trial safe_3_backward_inc>
/ ontrialbegin = [values.time_sound=(round(rand(60,180))); values.time_second_frame = values.time_sound+72; values.time_third_frame = values.time_second_frame+5;
values.Actiontype="Withdrawal"; values.congruency = "Incongruent"; values.object = "safe"; values.length = 3]
/ ontrialbegin = [trial.safe_3_backward_inc.insertstimulusframe(sound.take, values.time_sound);
trial.safe_3_backward_inc.insertstimulusframe(picture.safe_minus_second_frame, values.time_second_frame);
trial.safe_3_backward_inc.insertstimulusframe(picture.safe_minus_third_frame, values.time_third_frame);]
/ stimulusframes = [1 = safe_first_frame]
/ validresponse = (0)
/ inputdevice = mousekey
/ showmousecursor = false
/ trialduration = values.time_third_frame
/ branch = [trial.safe_3_backward_inc_respond;]
</trial>
<trial safe_3_backward_inc_respond>
/ stimulusframes = [1=safe_w]
/ inputdevice = mouse
/ showmousecursor = true
/ validresponse = (lbuttondown)
/ correctresponse = (lbuttondown)
/ ontrialend = [values.x=trial.safe_3_backward_inc_respond.responsex;values.y=trial.safe_3_backward_inc_respond.responsey;]
/ branch = [trial.space;]
</trial>
<trial safe_3_backward_con>
/ ontrialbegin = [values.time_sound=(round(rand(60,180))); values.time_second_frame = values.time_sound+72; values.time_third_frame = values.time_second_frame+5;
values.Actiontype="Withdrawal"; values.congruency = "Congruent"; values.object = "safe"; values.length = 3]
/ ontrialbegin = [trial.safe_3_backward_con.insertstimulusframe(sound.leave, values.time_sound);
trial.safe_3_backward_con.insertstimulusframe(picture.safe_minus_second_frame, values.time_second_frame);
trial.safe_3_backward_con.insertstimulusframe(picture.safe_minus_third_frame, values.time_third_frame);]
/ stimulusframes = [1 = safe_first_frame]
/ validresponse = (0)
/ inputdevice = mousekey
/ showmousecursor = false
/ trialduration = values.time_third_frame
/ branch = [trial.safe_3_backward_con_respond;]
</trial>
<trial safe_3_backward_con_respond>
/ stimulusframes = [1=safe_w]
/ inputdevice = mouse
/ showmousecursor = true
/ validresponse = (lbuttondown)
/ correctresponse = (lbuttondown)
/ ontrialend = [values.x=trial.safe_3_backward_con_respond.responsex;values.y=trial.safe_3_backward_con_respond.responsey;]
/ branch = [trial.space;]
</trial>
<block 3_safe_backward_con>
/ trials = [1= sequence(fixate,safe_3_backward_con)]
</block>
<block 3_safe_backward_inc>
/ trials = [1= sequence(fixate,safe_3_backward_inc)]
</block>
<list congruent>
/ items = (block.5_pain_forward_con, block.5_pain_backward_con, block.4_pain_forward_con, block.4_pain_backward_con, block.3_pain_forward_con, block.3_pain_backward_con, block.5_safe_forward_con,
block.5_safe_backward_con, block.4_safe_forward_con, block.4_safe_backward_con, block.3_safe_forward_con, block.3_safe_backward_con)
</list>
<list incongruent>
/ items = (block.5_pain_forward_inc, block.5_pain_backward_inc, block.4_pain_forward_inc, block.4_pain_backward_inc, block.3_pain_forward_inc, block.3_pain_backward_inc, block.5_safe_forward_inc,
block.5_safe_backward_inc, block.4_safe_forward_inc, block.4_safe_backward_inc, block.3_safe_forward_inc, block.3_safe_backward_inc)
</list>
<list blockselector>
/ items = (list.incongruent.nextvalue, list.congruent.nextvalue)
/ selectionmode = random
/ replace = false
</list>
<expt>
/ blocks = [1=Consent1;2=space;3-50=list.blockselector;51=debrief]
</expt>