Increasing the number of trials in the dot probe paradigm

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Increasing the number of trials in the dot probe paradigm

Increasing the number of trials in the dot probe paradigm

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alexa	alexa posted 8 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 27, Visits: 78	Hello, I have aquestion concerning the modification of the dot probe paradigm. I am currentlyusing the script of the alcohol DOT PROBE TASK - with images (Katja Borchert,last updated: 08-17-2015). I have donesome modifications – I replaced „alcohol“ with „highcaloric” and „neutral“ with“lowcaloric” because I would like to compare attentional bias to low- and highcaloricfood stimuli. Then, I have changed the name of the items accoding to the nameof my pictures. I would nowlike to change the DP. Originally, the DP comprises 10 practice trials, 40alcohol/neutral (10*4) trials and 40 filler trials. I would like to keep the 10practice trials and 40 filler trials but do more comparisons betweenhigh/lowcaloric food (instead of 10: 20 pairs of pictures --> 80 trials). I have changed the scriptaccording to my needs and it runs. But when I controlled the rawdata, I haveseen that for example some pictures pairs are presented 3 times, whereas otherpictures pairs 5 times. So I am pretty sure I have done something wrongmodifying the script (1. listing more items (<itemhighcaloricTarget_images>); 2. changing the lists (<listhighcaloricTarget_itemnumbers> <list highcaloricTarget_positions><list highcaloricTargetprobe_congruence>) as well as 3. the parameter <blockImageDotProbeTask>. Is thereanything more I have to do that the script works the way I want? Thanks alot for your help! Best, Alex Attachments DP_20_pairs.iqx (546 views, 42.00 KB)
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Dave	Dave posted 8 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	+x alexa - Thursday, November 17, 2016 Hello, I have aquestion concerning the modification of the dot probe paradigm. I am currentlyusing the script of the alcohol DOT PROBE TASK - with images (Katja Borchert,last updated: 08-17-2015). I have donesome modifications – I replaced „alcohol“ with „highcaloric” and „neutral“ with“lowcaloric” because I would like to compare attentional bias to low- and highcaloricfood stimuli. Then, I have changed the name of the items accoding to the nameof my pictures. I would nowlike to change the DP. Originally, the DP comprises 10 practice trials, 40alcohol/neutral (104) trials and 40 filler trials. I would like to keep the 10practice trials and 40 filler trials but do more comparisons betweenhigh/lowcaloric food (instead of 10: 20 pairs of pictures --> 80 trials). I have changed the scriptaccording to my needs and it runs. But when I controlled the rawdata, I haveseen that for example some pictures pairs are presented 3 times, whereas otherpictures pairs 5 times. So I am pretty sure I have done something wrongmodifying the script (1. listing more items (<itemhighcaloricTarget_images>); 2. changing the lists (<listhighcaloricTarget_itemnumbers> <list highcaloricTarget_positions><list highcaloricTargetprobe_congruence>) as well as 3. the parameter <blockImageDotProbeTask>. Is thereanything more I have to do that the script works the way I want? Thanks alot for your help! Best, Alex <block ImageDotProbeTask> /onblockbegin = [values.task = 2] /trials = [1-120 = noreplace(highcaloric, Filler)]* </block> Means you sample trials in equal proportions. You'll end up with 60 highcaloric trials and 60 filler trials in random order. To achieve 80 highcaloric trials > "40 filler trials but do more comparisons betweenhigh/lowcaloric food (instead of 10: 20 pairs of pictures --> 80 trials)" you need to specify /trials = [1-120 = noreplace(highcaloric, highcaloric, Filler)]
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alexa	alexa posted 8 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 27, Visits: 78	+x Dave - Thursday, November 17, 2016 +x alexa - Thursday, November 17, 2016 Hello, I have aquestion concerning the modification of the dot probe paradigm. I am currentlyusing the script of the alcohol DOT PROBE TASK - with images (Katja Borchert,last updated: 08-17-2015). I have donesome modifications – I replaced „alcohol“ with „highcaloric” and „neutral“ with“lowcaloric” because I would like to compare attentional bias to low- and highcaloricfood stimuli. Then, I have changed the name of the items accoding to the nameof my pictures. I would nowlike to change the DP. Originally, the DP comprises 10 practice trials, 40alcohol/neutral (104) trials and 40 filler trials. I would like to keep the 10practice trials and 40 filler trials but do more comparisons betweenhigh/lowcaloric food (instead of 10: 20 pairs of pictures --> 80 trials). I have changed the scriptaccording to my needs and it runs. But when I controlled the rawdata, I haveseen that for example some pictures pairs are presented 3 times, whereas otherpictures pairs 5 times. So I am pretty sure I have done something wrongmodifying the script (1. listing more items (<itemhighcaloricTarget_images>); 2. changing the lists (<listhighcaloricTarget_itemnumbers> <list highcaloricTarget_positions><list highcaloricTargetprobe_congruence>) as well as 3. the parameter <blockImageDotProbeTask>. Is thereanything more I have to do that the script works the way I want? Thanks alot for your help! Best, Alex <block ImageDotProbeTask> /onblockbegin = [values.task = 2] /trials = [1-120 = noreplace(highcaloric, Filler)]* </block> Means you sample trials in equal proportions. You'll end up with 60 highcaloric trials and 60 filler trials in random order. To achieve 80 highcaloric trials > "40 filler trials but do more comparisons betweenhigh/lowcaloric food (instead of 10: 20 pairs of pictures --> 80 trials)" you need to specify /trials = [1-120 = noreplace(highcaloric, highcaloric, Filler)] That works perfectly! Thanks a lot!!
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