By AndresR - 12/30/2016
Hello!
I am trying to run a ST-SB-IAT and I want one block to run each trial once (8 trials) and each trial has 6 items. I want each trial and each item run once, so I've used the noreplace command (?) in both the picture element and in the block element.
Block structure:
<block measureSC>
/trials= [1-48=noreplacenorepeat(targAhi, targAlo, targBhi, targBlo, SCattrAhi, SCattrAlo, SCattrAhi, SCattrAlo)]
/bgstim= (label_targA,label_targB, label_SCattrAhi, label_SCattrAlo, divider)
/preinstructions= (measureSC)
/responsemode = correct
/onblockend = [values.SCd = expressions.d]
</block>
Picture element structure:
<picture SCattrAhi> /items = SCattrA /select = noreplacenorepeat /resetinterval = 0 /position = (50, values.posHI) /size = (20%, 20%) </picture>
<picture SCattrAlo> /items = SCattrA /select = noreplacenorepeat /resetinterval = 0 /position = (50, values.posLO) /size = (20%, 20%) </picture>
<picture targAhi> /items = targA /select = noreplacenorepeat /resetinterval = 0 /position = (50, values.posHI) /size = (20%, 20%) </picture>
<picture targAlo> /items = targA /select = noreplacenorepeat /resetinterval = 0 /position = (50, values.posLO) /size = (20%, 20%) </picture>
<picture targBhi> /items = targB /select = noreplacenorepeat /resetinterval = 0 /position = (50, values.posHI) /size = (20%, 20%) </picture>
<picture targBlo> /items = targB /select = noreplacenorepeat /resetinterval = 0 /position = (50, values.posLO) /size = (20%, 20%) </picture>
I know that the SCattr trials are in there twice - that's supposed to be like that. I want every picture in the items list to be presented like this: SCattrAhi x2; SCattrAlo x2, targAhi x1; targAlo x1; targBhi x1; targBlo x1.
What am I doing wrong? I've scavenged through the threads on this forum that mention these topics but none of the fixes have helped me so far.
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By AndresR - 12/30/2016
I couldn't figure out how to edit the first post so I'll add the info I forgot.
I want every picture in the items list to be presented like this: SCattrAhi x2; SCattrAlo x2, targAhi x1; targAlo x1; targBhi x1; targBlo x1. Instead some SCattrA pictures are presented 5 times, instead of 4, in turn, some are presented 3 times. I need each picture to be presented an equal number of times.
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By Dave - 1/1/2017
+xI couldn't figure out how to edit the first post so I'll add the info I forgot. I want every picture in the items list to be presented like this: SCattrAhi x2; SCattrAlo x2, targAhi x1; targAlo x1; targBhi x1; targBlo x1. Instead some SCattrA pictures are presented 5 times, instead of 4, in turn, some are presented 3 times. I need each picture to be presented an equal number of times.
/trials= [1-48=noreplacenorepeat(targAhi, targAlo, targBhi, targBlo, SCattrAhi, SCattrAlo, SCattrAhi, SCattrAlo)]
What this does is run
6 targAhi trials,
6 targAlo trials,
6 targBhi trials,
6 targBlo trials,
12 SCattrAhi trials, and
12 SCattrAlo trials.
Item selection is a different matter; this would be determined by the respective <picture> elements' /select attributes.
Try explicitly resetting the <picture> elements' selection /onblockbegin:
<block measureSC>
/ onblockbegin = [picture.SCattrAhi.resetselection(); picture.SCattrAlo.resetselection(); ...]
...
</block>
Also make sure that the <trial> elements actually display the correct <picture> elements, i.e., <trial SCattrAhi> should display <picture SCattrAhi>
<trial SCattrAhi>
/ stimulusframes = [1=SCattrAhi]
...
</trial>
and so forth.
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