I am a graduate student at the University of Central Oklahoma and I am working on my thesis doing a race IAT. Pebl2.1 thankfully has a IAT built into their script but unlike typical IAT where the key functions are "E" and "I" pebl uses "1" and "2" to signal the left and right side of their screen. My thesis advisor is super picky and will not let me move forward with running participants unless I change the keys to the original IAT form which is E and I. I am struggling miserably trying to figure this out so I am reaching out to see if someone has successfully changed the script? If so can you please help me.
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Note that these two are opposite codings of correct response.
You will also need to change some text strings, which should be pretty straightforward (see line 386, change '1' to 'E') and do that throughout. Double-quotes " delimits a text string, so a single-quote iinside the text just shows up directly.
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There are a couple additional tweaks needed to get the coding correct. See attached--this should work except for any additional instructions you may have added.
Thank You sooooo much Shane you are a HUGEEEE help. Now unfortunately my professor is wanting a practice trial to be at the beginning of the first trial? again I am stumped I wish I was better at C++ language. could you by any chance point me in the right direction on the syntax of how I would go about doing that? If that is too much to ask I completely understand :) and thanks for your swift response !
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Hi Leanna,
Since Shane has made all codes open source, you may use the IAT source
codes to create your modified task. As I have not looked into the IAT
specifically, I can't tell you what exactly to do. But you may try figuring
out how the number of trials and its stimuli have been specified in the
original code, use the same information at the beginning, and change the
number of trials and stimuli type for the practice. Of course,
differentiating instructions between practice and actual task will also be
made part of.
Hope this helps.
Thank You sooooo much Shane you are a HUGEEEE help. Now unfortunately my
professor is wanting a practice trial to be at the beginning of the first
trial? again I am stumped I wish I was better at C++ language. could you by
any chance point me in the right direction on the syntax of how I would go
about doing that? If that is too much to ask I completely understand :) and
thanks for your swift response !
You can hard-code trials by either calling 'MismatchTrial()' or 'MatchTrial()'. Assuming you want a couple match trials at the beginning of a block, you can pick a random row from the stimulus table stimAll and use that. These get recorded to the data file so you need to print the first columns of the CSV too. The following code will handle it:
## do a practice triali<-Sample(stimAll)FilePrint_(gFileOut,gSubNum+",Practice,0,")MatchTrial(First(i),Nth(i,2),Nth(i,3),Nth(i,4))
or
## do a practice triali<-Sample(stimAll)FilePrint_(gFileOut,gSubNum+",Practice,0,")MisMatchTrial(First(i),Nth(i,2),Nth(i,3),Nth(i,4))
If you open the IAT.pbl file, put one of these at the beginning of the block you care about, right before the loop(i,stimAll). Note block 4 and 5 used mismatch and 1-2- 3 used MatchTrial. If you want more practice, copy the code multiple times. These will just appear as extra trials and the block will start immediately.
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Hello,
I am a graduate student at the University of Central Oklahoma and I am working on my thesis doing a race IAT. Pebl2.1 thankfully has a IAT built into their script but unlike typical IAT where the key functions are "E" and "I" pebl uses "1" and "2" to signal the left and right side of their screen. My thesis advisor is super picky and will not let me move forward with running participants unless I change the keys to the original IAT form which is E and I. I am struggling miserably trying to figure this out so I am reaching out to see if someone has successfully changed the script? If so can you please help me.
To fix this, you just need to go into the IAT.pbl file using a text editor like notepad++.
Change two lines (474 and 525)
from:
and at line 482:
if(ToNumber(lgoodness)==1)
{
corrResp <- 2
} else {
corrResp <- 1
}
to
if(ToNumber(lgoodness)==1)
{
corrResp <- "I"
} else {
corrResp <- "E"
}
and
if(type != lgoodness)
{
corrResp <- 1
} else {
corrResp <- 2
}
to
if(type != lgoodness)
{
corrResp <- "E"
} else {
corrResp <- "I"
}
Note that these two are opposite codings of correct response.
You will also need to change some text strings, which should be pretty straightforward (see line 386, change '1' to 'E') and do that throughout. Double-quotes " delimits a text string, so a single-quote iinside the text just shows up directly.
There are a couple additional tweaks needed to get the coding correct. See attached--this should work except for any additional instructions you may have added.
Thank You sooooo much Shane you are a HUGEEEE help. Now unfortunately my professor is wanting a practice trial to be at the beginning of the first trial? again I am stumped I wish I was better at C++ language. could you by any chance point me in the right direction on the syntax of how I would go about doing that? If that is too much to ask I completely understand :) and thanks for your swift response !
Hi Leanna,
Since Shane has made all codes open source, you may use the IAT source
codes to create your modified task. As I have not looked into the IAT
specifically, I can't tell you what exactly to do. But you may try figuring
out how the number of trials and its stimuli have been specified in the
original code, use the same information at the beginning, and change the
number of trials and stimuli type for the practice. Of course,
differentiating instructions between practice and actual task will also be
made part of.
Hope this helps.
Best,
Ashwini
On Thu, Sep 28, 2023 at 2:08 PM Leanna lbell15@users.sourceforge.net
wrote:
BTW, this isn't C++.
You can hard-code trials by either calling 'MismatchTrial()' or 'MatchTrial()'. Assuming you want a couple match trials at the beginning of a block, you can pick a random row from the stimulus table stimAll and use that. These get recorded to the data file so you need to print the first columns of the CSV too. The following code will handle it:
or
If you open the IAT.pbl file, put one of these at the beginning of the block you care about, right before the loop(i,stimAll). Note block 4 and 5 used mismatch and 1-2- 3 used MatchTrial. If you want more practice, copy the code multiple times. These will just appear as extra trials and the block will start immediately.