Millisecond Forums » Millisecond Forums » Inquisit 4 » dot probe

dot probe

jens — Tue, 31 Mar 2015 05:38:17 GMT

Hello,

a dot-probe experiment that I am programming does not run the way I intend it to run and I cannot find the error. I tried to use four list-elements to present the probe "F" and "J" equally often on the left side or the right side of the screen and equally often preceded by an emotion word or a non-emotion word. However, I do not get the wanted distribution. Given that sometimes "A" or "B" is presented as a probe indicates that the if-construction is sometimes not evaluated. But why?

Best regards Jens

RE: dot probe

Dave — Tue, 31 Mar 2015 05:38:17 GMT

If you have complex response validation logic in /iscorrectresponse, the monkey has trouble handling that and won't necessarily achieve whatever you configured in the <monkey> element.

RE: dot probe

jens — Tue, 31 Mar 2015 05:00:16 GMT

Hello,

I use the monkey to test run the attached experiment. As you can see I set the percentcorrect (of the monkey) to 90%. However, the monkey produces much more errors than 90%. So, I wonder whether I still have a programming error? Hints are welcome.

Best regards Jens

RE: dot probe

jens — Mon, 30 Mar 2015 08:35:00 GMT

Well,

that was stupid. I somehow deleted the relevant part of the comparison from the code.

Best Jens

RE: dot probe

Dave — Mon, 30 Mar 2015 08:31:56 GMT

c.f. https://www.millisecond.com/forums/FindPost15825.aspx

RE: dot probe

Dave — Mon, 30 Mar 2015 08:27:52 GMT

Jens,

/iscorrectresponse = [if (text.probe.right.currentitem == "F"){values.korrekt = 36} else {values.korrekt = 33}]

cannot work because you never check values.korrekt against the trial's response property.

RE: dot probe

jens — Mon, 30 Mar 2015 08:21:30 GMT

Hello,

the evaluation no longer works.
[quote]<trial t.neg.word.right>
/ontrialbegin = [if (list.posi.probe.neg.right.nextvalue == 1)      {text.probe.right.hposition = values.links; values.pos = values.links; text.probe.right.setitem("F",1)}
                  else if (list.posi.probe.neg.right.nextvalue == 2) {text.probe.right.hposition = values.rechts; values.pos = values.rechts; text.probe.right.setitem("F",1)}
                  else if (list.posi.probe.neg.right.nextvalue == 3) {text.probe.right.hposition = values.links; values.pos = values.links; text.probe.right.setitem("J",1)}
                  else if (list.posi.probe.neg.right.nextvalue == 4) {text.probe.right.hposition = values.rechts; values.pos = values.rechts; text.probe.right.setitem("J",1)}]
/stimulusframes = [ 1 = fixation; 30 = maske; 31 = neg.word.right.tar, neg.word.right.dis; 42 = maske; 43 = probe.right ]
/validresponse = ("F", "J")
/iscorrectresponse = [if (text.probe.right.currentitem == "F"){values.korrekt = 36} else {values.korrekt = 33}]
/timeout = 3000
</trial>[/quote]

/iscorrectresponse = [if (text.probe.right.currentitem == "F"){values.korrekt = 36} else {values.korrekt = 33}] always evaluates to 1 but it should evaluate to 0 in row 2 or row 4 of the data file (or the assignment of values.korrekt is incorrect).
subject    blockcode    trialnum    trialcode    latency    response    correct    values.korrekt    values.pos    stimulusitem1    stimulusitem2    stimulusitem3    stimulusitem4    stimulusitem5    stimulusitem6
1    block.pos    1    t.pos.word.right    512    33    1    33    60pct    *    maske    genial    Koran    maske    J
1    block.pos    2    t.pos.word.left    510    36    1    33    40pct    *    maske    Jubel    Metzger    maske    J
1    block.pos    3    t.pos.word.right    498    36    1    36    60pct    *    maske    Busen    heroisch    maske    F
1    block.pos    4    t.pos.word.left    484    33    1    36    60pct    *    maske    brilliant    Umbruch    maske    F
I
Best Jens

RE: dot probe

jens — Mon, 30 Mar 2015 07:59:15 GMT

Hello Dave,

I will inform our IT about the new release.

RE: dot probe

Dave — Mon, 30 Mar 2015 07:37:55 GMT

Please note that the current release is 4.0.8.0, available (as always) via

https://www.millisecond.com/download

RE: dot probe

jens — Mon, 30 Mar 2015 07:34:34 GMT

Hello,

I update to 4.0.7 from 4.0.2 and the quotes disappeared. Thanks a lot.

Jens

RE: dot probe

Dave — Mon, 30 Mar 2015 06:48:48 GMT

Shouldn't happen if your Inquisit installation is up to date.

RE: dot probe

jens — Mon, 30 Mar 2015 06:43:05 GMT

Hello,

ok, when I use setitem the probe is displayed with "".

[quote]<trial t.neg.word.left>
/ontrialbegin = [if (list.posi.probe.neg.left.nextvalue == 1)      {text.probe.left.hposition = values.links; values.pos = values.links; text.probe.left.setitem("F", 1)}
                  else if (list.posi.probe.neg.left.nextvalue == 2) {text.probe.left.hposition = values.rechts; values.pos = values.rechts; text.probe.left.setitem("F", 1)}
                  else if (list.posi.probe.neg.left.nextvalue == 3) {text.probe.left.hposition = values.links; values.pos = values.links; text.probe.left.setitem("J", 1)}
                  else if (list.posi.probe.neg.left.nextvalue == 4) {text.probe.left.hposition = values.rechts; values.pos = values.rechts; text.probe.left.setitem("J", 1)}]
/stimulusframes = [ 1 = fixation; 30 = maske; 31 = neg.word.left.tar, neg.word.left.dis; 42 = maske; 43 = probe.left ]
/validresponse = ("F", "J")
/iscorrectresponse = [if (text.probe.left.currentitem == "F") {values.korrekt = 33} else {values.korrekt = 36}]
/timeout = 3000
</trial>

[/quote]

RE: dot probe

Dave — Mon, 30 Mar 2015 05:42:35 GMT

In your <trial> elements, you are constantly *inserting* items into the probe <text> elements:

<trial t.neg.word.left>
/ ontrialbegin = [if (list.posi.probe.neg.left.nextvalue == 1)      {text.probe.left.hposition = values.links; values.pos = values.links; text.probe.left.insertitem("F", 1)}
                  else if (list.posi.probe.neg.left.nextvalue == 2) {text.probe.left.hposition = values.rechts; values.pos = values.rechts; text.probe.left.insertitem("F", 1)}
                  else if (list.posi.probe.neg.left.nextvalue == 3) {text.probe.left.hposition = values.links; values.pos = values.links; text.probe.left.insertitem("J", 1)}
                  else if (list.posi.probe.neg.left.nextvalue == 4) {text.probe.left.hposition = values.rechts; values.pos = values.rechts; text.probe.left.insertitem("J", 1)}]

Inserting an item does *not* remove any items that are already there. Since the <text> elements sample randomly without replacement, the already existing items ("A", "B") may eventually be sampled.

You don't want to use insertitem(). What you want to use is the setitem() function.