Millisecond Forums

> I am just trying to work out how to code a correct response for when a certain dropsource is put into a certain droptarget
> (for example, if "picture A" was in pos1, and "picture B" was in pos2).

I don't quite understand how you wish the trial to behave based on that description. Could you please provide a more detailed explanation? As in: Which objects and how many objects are supposed to be dropped where to be considered a correct response and how is the trial supposed to behave otherwise (i.e. what is an "incorrect" but valid response)?

Hi Dave,

Thanks for your reply. Sorry, the code I may have posted was a simplistic version of the actual code. I am hoping participants will be able to rank 6 out of 12 possible shapes (A-L) and it will code for the correct response (for example, A in pos1, B in pos2, C in pos3, D in pos4, E in pos5, F pos6). Any other shapes in a box, or one of the correct 6 in the wrong box would be an incorrect response.

<trial trial>
/ stimulustimes = [0 = pos1,pos2,pos3,pos4,pos5,pos6,A,B,C,D,E,F,G,H,I,J,K,L,posrep1,posrep2,posrep3,posrep4,posrep5,posrep6,posrep2_1,posrep2_2,posrep2_3,posrep2_4,posrep2_5,posrep2_6
]
/ inputdevice = dragdrop
/ timeout = 100000000000
</trial>


<picture A>
/ items = ("A.jpg")
/ position = (25,20)
/ dropsource = true
</picture>

<picture B>
/ items = ("B.jpg")
/ position = (35,20)
/ dropsource = true
</picture>

<picture C>
/ items = ("C.jpg")
/ position = (45,20)
/ dropsource = true
</picture>

<picture D>
/ items = ("D.jpg")
/ position = (55,20)
/ dropsource = true
</picture>

<picture E>
/ items = ("E.jpg")
/ position = (65,20)
/ dropsource = true
</picture>

<picture F>
/ items = ("F.jpg")
/ position = (75,20)
/ dropsource = true
</picture>


<picture G>
/ items = ("G.jpg")
/ position = (25,40)
/ dropsource = true
</picture>

<picture H>
/ items = ("H.jpg")
/ position = (35,40)
/ dropsource = true
</picture>

<picture I>
/ items = ("I.jpg")
/ position = (45,40)
/ dropsource = true
</picture>

<picture J>
/ items = ("J.jpg")
/ position = (55,40)
/ dropsource = true
</picture>

<picture K>
/ items = ("E.jpg")
/ position = (65,40)
/ dropsource = true
</picture>

<picture L>
/ items = ("L.jpg")
/ position = (75,40)
/ dropsource = true
</picture>



<shape pos1>
/ hposition = 25
/ vposition = 60
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = grey
</shape>

<shape pos2>
/ hposition = 35
/ vposition = 60
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = grey
</shape>

<shape pos3>
/ hposition = 45
/ vposition = 60
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = grey
</shape>

<shape pos4>
/ hposition = 55
/ vposition = 60
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = grey
</shape>

<shape pos5>
/ hposition = 65
/ vposition = 60
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = grey
</shape>

<shape pos6>
/ hposition = 75
/ vposition = 60
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = grey
</shape>



<shape posrep1>
/ hposition = 25
/ vposition = 20
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = lightgrey
</shape>

<shape posrep2>
/ hposition = 35
/ vposition = 20
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = lightgrey
</shape>

<shape posrep3>
/ hposition = 45
/ vposition = 20
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = lightgrey
</shape>

<shape posrep4>
/ hposition = 55
/ vposition = 20
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = lightgrey
</shape>

<shape posrep5>
/ hposition = 65
/ vposition = 20
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = lightgrey
</shape>

<shape posrep6>
/ hposition = 75
/ vposition = 20
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = lightgrey
</shape>


<shape posrep2_1>
/ hposition = 25
/ vposition = 40
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = lightgrey
</shape>

<shape posrep2_2>
/ hposition = 35
/ vposition = 40
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = lightgrey
</shape>

<shape posrep2_3>
/ hposition = 45
/ vposition = 40
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = lightgrey
</shape>

<shape posrep2_4>
/ hposition = 55
/ vposition = 40
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = lightgrey
</shape>

<shape posrep2_5>
/ hposition = 65
/ vposition = 40
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = lightgrey
</shape>

<shape posrep2_6>
/ hposition = 75
/ vposition = 40
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = lightgrey
</shape>

Thanks for the clarification. Basically, you'll need to do much the same thing as the Tower of London script does:
https://www.millisecond.com/download/library/v5/toweroflondon/toweroflondon.iqzip

You need basically need to loop your trial continuously until all boxes have been occupied, updating whether a given box is still "free" / empty from trial to trial. In the ToL script linked above, most of that work happens in <trial choice>. As for changing a box's droptarget status, see the /available_a_slots, /available_b_slots and /available_c_slots <expressions> and the values involved.

Once all are occupied, you evaluate the end state and determine whether the ranking is correct, much like the ToL script determines whether the state produced by the participant matches the "target" state (cf. expressions.targetachieved).

Does that make sense?

Okay, great, thanks. I was also just wondering, at the very least, how to get it to output the record of where each participant had put each shape in the results file? It doesn't seem to be recording it by default at the moment.

You should be able to get that by logging the respective object's horizontal and vertical position (available per the hposition and vposition properties) as in

<data>
/ columns = (..., picture.a.hposition, picture.a.vposition, picture.b.hposition, picture.b.vposition, ...)
...
</data>

Great - thank you~! That should suffice.

Just couple more things (sorry!)
1) Is there a way to make sure they can't put more than one dropsource on one droptarget?
2) is there a way to make sure they can't progress from the trial until all the droptargets have been filled with one dropsource?

> 1) Is there a way to make sure they can't put more than one dropsource on one droptarget?

Yes.

> 2) is there a way to make sure they can't progress from the trial until all the droptargets have been filled with one dropsource?

Yes.

The ToL script essentially does both of these things (the expressions and logic in <trial choice> referenced in my previous reply takes care of that), but let me code up a toy example for you based on your code, give me half an hour or so.

Here's a quick sketch:

<block myblock>
/ trials = [1-2=start]
</block>

// expressions determine whether a box is available as a drop target (empty) or not (full)
<expressions>
/ available_p1_slots = (1-values.p1_count)
/ available_p2_slots = (1-values.p2_count)
/ available_p3_slots = (1-values.p3_count)
</expressions>

<values>
/ p1_count = 0
/ p2_count = 0
/ p3_count = 0
</values>

// starts a new round
// sets the values "counting" whether a box is occupied or not back to zero
// places the objects A to F in their original start positions
<trial start>
/ ontrialbegin = [
values.p1_count=0;
values.p2_count=0;
values.p3_count=0;
text.A.hposition = 25%;
text.A.vposition = 20%;
text.B.hposition = 35%;
text.B.vposition = 20%;
text.C.hposition = 45%;
text.C.vposition = 20%;
text.D.hposition = 55%;
text.D.vposition = 20%;
text.E.hposition = 65%;
text.E.vposition = 20%;
text.F.hposition = 75%;
text.F.vposition = 20%;
]
/ branch = [
    trial.mytrial
]
/ trialduration = 0
</trial>

// this trial is looped until all boxes are occupied with exactly one item
<trial mytrial>
/ ontrialbegin = [

shape.pos1.droptarget = expressions.available_p1_slots;
shape.pos2.droptarget = expressions.available_p2_slots;
shape.pos3.droptarget = expressions.available_p3_slots;

]
/ stimulustimes = [0 = pos1,pos2,pos3,A,B,C,D,E,F]
/ validresponse = (pos1,pos2,pos3)
/ isvalidresponse = [
if (trial.mytrial.response == "pos1")
{
    values.p1_count += 1;
    shape.pos1.droptarget;
}
else if (trial.mytrial.response == "pos2")
{
    values.p2_count += 1;
    shape.pos2.droptarget;
}
else if (trial.mytrial.response == "pos3")
{
    values.p3_count += 1;
    shape.pos3.droptarget;
}
else
    true;
]
/ inputdevice = dragdrop
/ branch = [
    if (values.p1_count + values.p2_count + values.p3_count >= 3) trial.end else trial.mytrial
]
</trial>

// this trial is invoked when all boxes have been filled
// any evaluation of the "correctness" would happen here
<trial end>
/ stimulusframes = [1=endtext]
/ validresponse = (57)
</trial>

<text endtext>
/ items = ("All boxes filled.")
</text>

<text A>
/ items = ("A.jpg")
/ position = (25,20)
/ dropsource = true
</text>

<text B>
/ items = ("B.jpg")
/ position = (35,20)
/ dropsource = true
</text>

<text C>
/ items = ("C.jpg")
/ position = (45,20)
/ dropsource = true
</text>

<text D>
/ items = ("D.jpg")
/ position = (55,20)
/ dropsource = true
</text>

<text E>
/ items = ("F.jpg")
/ position = (65,20)
/ dropsource = true
</text>

<text F>
/ items = ("F.jpg")
/ position = (75,20)
/ dropsource = true
</text>


<shape pos1>
/ hposition = 25
/ vposition = 60
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = grey
</shape>

<shape pos2>
/ hposition = 35
/ vposition = 60
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = grey
</shape>

<shape pos3>
/ hposition = 45
/ vposition = 60
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = grey
</shape>

<shape pos4>
/ hposition = 55
/ vposition = 60
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = grey
</shape>

<shape pos5>
/ hposition = 65
/ vposition = 60
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = grey
</shape>

<shape pos6>
/ hposition = 75
/ vposition = 60
/ shape = rectangle
/ droptarget = true
/ size = (170,170)
/ color = grey
</shape>

Thanks very much for all your help!