David,
Unfortunately, the length of the experiment isn't easily controlled
using a PEBL parameter. Right now, there are three blocks, a practice
block, round 1 and round 2. There are two things you can do:
1. by default, the trials provided are shuffled versions of the lists
specified in the color-stroop.pbl file from line 547 to around 641.
They look like this:
x <-
[["I",yellow,2],["N",w1,4],["C",green,3],["N",w2,1], ["C",yel
low,4],["I",green,2],["C",blue,2],["N",w3,3], ["I",blue,3],["
I",yellow,3],["C",red,1],["N",w2,2], ["C",green,3],["C",re
d,1],["N",w3,1],["C",blue,2], ["C",yellow,4],["I",red,3],["N"
,w3,4],["N",w4,2], ["I",green,4],["N",w1,2],["I",yellow,1],["
I",red,4]]
This represents about 28 trials where NCI represent congruency, the
second is the word (it is a variable representing the localized word),
and the third is the color ID (representing a specific RGB value).
You can edit these lists to make exactly the trials you want to give.
Be default, the practice is 28 trials, and the other two rounds are
like 50 trials.
2. Alternately, you can set the parameter UsePreset to 0. This will
auto-generate an 8-trial practice, and two 28-trial test rounds. This
is close to 50 trials, but you can adjust the 8 and 28 in the
Round1Trials, Round2Trials, and PracticeTrials function we were just
editing to be whatever you want.
Best of luck,Shane
On Mon, 2017-05-08 at 07:45 +0000, David Goble wrote:
> Good day
>
>
>
>
> I am wanting to you your strop task for the assessment of executive
> functioning (response inhibition and decision making). Could you
> perhaps run me though how i can alter the duration of the test, so
> that we can run a test that is approximately
> 50 responses long.
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> Kindest regards
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> David Goble (PhD)
>
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>
> School of Physiology
> Wits University, Johannesburg, South Africa
> Mobile: +27 (72) 225 6909
>
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