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RE: Using functions to delete available trials

Using functions to delete available trials

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jessjones12	jessjones12 posted 7 Years Ago HOT Topic Details Share Topic
Group: Forum Members Posts: 4, Visits: 10	Hi, Question: Is there a function that will allow me to delete subsequent available trials if a specific condition is met? My task: I am trying to create a short recognition memory task (old v. new judgments) in which there are 16 trials (randomized). Each trial will display 1 image pulled randomly from a group of 4. Each group will contain 4 images from the same category: “Old” and contain emotion content "Old” and contain neutral content “New” and contain emotion content “New” and contain neutral content There are 4 categories that each image group belongs to, and 3 groups of 4 images per category (48 images total): positive/social negative/social positive/non-social negative/non-social I need to make sure that out of the 16 trials shown as follows: 8 “old” trials 4 emotion content 1 positive/social 1 negative/social 1 positive/non-social 1 negative/non-social 4 neutral content 1 positive/social 1 negative/social 1 positive/non-social 1 negative/non-social 8 “new” trials 4 emotion content 1 positive/social 1 negative/social 1 positive/non-social 1 negative/non-social 4 neutral content 1 positive/social 1 negative/social 1 positive/non-social 1 negative/non-social My problem: Once an image from a specific group is shown, I want the rest of the group to be eliminated from the available selection pool. I have done this in the past with less complicated constraints by simply using the “/select” and “/resetinterval” attributes, but this has not been working for me with this design. I have also tried functions like “removeitem()”, but because I can only specific the item index and not the specific text in an item list,this creates issues with my item pools when randomizing (what was at index 3 becomes index 2 when the item at index 1 is deleted and so on). “Clearstimulusframes()” does delete the frames from a trial (if I create a single trial for each image), but the trial will still run and simply not display stimuli. If there is a way or function that will allow me to delete subsequent available trials if a specific condition is met, that would be great. Any help would be greatly appreciated. Jess Stimulus pool: "PositiveSocial_emotion_old_group1.jpg" "PositiveSocial_neutral_old_group1.jpg" "PositiveSocial_emotion_new_group1.jpg" "PositiveSocial_neutral_new_group1.jpg" "PositiveSocial_emotion_old_group2.jpg" "PositiveSocial_neutral_old_group2.jpg" "PositiveSocial_emotion_new_group2.jpg" "PositiveSocial_neutral_new_group2.jpg" "PositiveSocial_emotion_old_group3.jpg" "PositiveSocial_neutral_old_group3.jpg" "PositiveSocial_emotion_new_group3.jpg" "PositiveSocial_neutral_new_group3.jpg" "NegativeSocial_emotion_old_group1.jpg" "NegativeSocial_neutral_old_group1.jpg" "NegativeSocial_emotion_new_group1.jpg" "NegativeSocial_neutral_new_group1.jpg" "NegativeSocial_emotion_old_group2.jpg" "NegativeSocial_neutral_old_group2.jpg" "NegativeSocial_emotion_new_group2.jpg" "NegativeSocial_neutral_new_group2.jpg" "NegativeSocial_emotion_old_group3.jpg" "NegativeSocial_neutral_old_group3.jpg" "NegativeSocial_emotion_new_group3.jpg" "NegativeSocial_neutral_new_group3.jpg" "PositiveNonSocial_emotion_old_group1.jpg" "PositiveNonSocial_neutral_old_group1.jpg" "PositiveNonSocial_emotion_new_group1.jpg" "PositiveNonSocial_neutral_new_group1.jpg" "PositiveNonSocial_emotion_old_group2.jpg" "PositiveNonSocial_neutral_old_group2.jpg" "PositiveNonSocial_emotion_new_group2.jpg" "PositiveNonSocial_neutral_new_group2.jpg" "PositiveNonSocial_emotion_old_group3.jpg" "PositiveNonSocial_neutral_old_group3.jpg" "PositiveNonSocial_emotion_new_group3.jpg" "PositiveNonSocial_neutral_new_group3.jpg" "NegativeNonSocial_emotion_old_group1.jpg" "NegativeNonSocial_neutral_old_group1.jpg" "NegativeNonSocial_emotion_new_group1.jpg" "NegativeNonSocial_neutral_new_group1.jpg" "NegativeNonSocial_emotion_old_group2.jpg" "NegativeNonSocial_neutral_old_group2.jpg" "NegativeNonSocial_emotion_new_group2.jpg" "NegativeNonSocial_neutral_new_group2.jpg" "NegativeNonSocial_emotion_old_group3.jpg" "NegativeNonSocial_neutral_old_group3.jpg" "NegativeNonSocial_emotion_new_group3.jpg" "NegativeNonSocial_neutral_new_group3.jpg"
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Dave	Dave posted 7 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	+x jessjones12 - Friday, September 29, 2017 Hi, Question: Is there a function that will allow me to delete subsequent available trials if a specific condition is met? My task: I am trying to create a short recognition memory task (old v. new judgments) in which there are 16 trials (randomized). Each trial will display 1 image pulled randomly from a group of 4. Each group will contain 4 images from the same category: “Old” and contain emotion content "Old” and contain neutral content “New” and contain emotion content “New” and contain neutral content There are 4 categories that each image group belongs to, and 3 groups of 4 images per category (48 images total): positive/social negative/social positive/non-social negative/non-social I need to make sure that out of the 16 trials shown as follows: 8 “old” trials 4 emotion content 1 positive/social 1 negative/social 1 positive/non-social 1 negative/non-social 4 neutral content 1 positive/social 1 negative/social 1 positive/non-social 1 negative/non-social 8 “new” trials 4 emotion content 1 positive/social 1 negative/social 1 positive/non-social 1 negative/non-social 4 neutral content 1 positive/social 1 negative/social 1 positive/non-social 1 negative/non-social My problem: Once an image from a specific group is shown, I want the rest of the group to be eliminated from the available selection pool. I have done this in the past with less complicated constraints by simply using the “/select” and “/resetinterval” attributes, but this has not been working for me with this design. I have also tried functions like “removeitem()”, but because I can only specific the item index and not the specific text in an item list,this creates issues with my item pools when randomizing (what was at index 3 becomes index 2 when the item at index 1 is deleted and so on). “Clearstimulusframes()” does delete the frames from a trial (if I create a single trial for each image), but the trial will still run and simply not display stimuli. If there is a way or function that will allow me to delete subsequent available trials if a specific condition is met, that would be great. Any help would be greatly appreciated. Jess Stimulus pool: "PositiveSocial_emotion_old_group1.jpg" "PositiveSocial_neutral_old_group1.jpg" "PositiveSocial_emotion_new_group1.jpg" "PositiveSocial_neutral_new_group1.jpg" "PositiveSocial_emotion_old_group2.jpg" "PositiveSocial_neutral_old_group2.jpg" "PositiveSocial_emotion_new_group2.jpg" "PositiveSocial_neutral_new_group2.jpg" "PositiveSocial_emotion_old_group3.jpg" "PositiveSocial_neutral_old_group3.jpg" "PositiveSocial_emotion_new_group3.jpg" "PositiveSocial_neutral_new_group3.jpg" "NegativeSocial_emotion_old_group1.jpg" "NegativeSocial_neutral_old_group1.jpg" "NegativeSocial_emotion_new_group1.jpg" "NegativeSocial_neutral_new_group1.jpg" "NegativeSocial_emotion_old_group2.jpg" "NegativeSocial_neutral_old_group2.jpg" "NegativeSocial_emotion_new_group2.jpg" "NegativeSocial_neutral_new_group2.jpg" "NegativeSocial_emotion_old_group3.jpg" "NegativeSocial_neutral_old_group3.jpg" "NegativeSocial_emotion_new_group3.jpg" "NegativeSocial_neutral_new_group3.jpg" "PositiveNonSocial_emotion_old_group1.jpg" "PositiveNonSocial_neutral_old_group1.jpg" "PositiveNonSocial_emotion_new_group1.jpg" "PositiveNonSocial_neutral_new_group1.jpg" "PositiveNonSocial_emotion_old_group2.jpg" "PositiveNonSocial_neutral_old_group2.jpg" "PositiveNonSocial_emotion_new_group2.jpg" "PositiveNonSocial_neutral_new_group2.jpg" "PositiveNonSocial_emotion_old_group3.jpg" "PositiveNonSocial_neutral_old_group3.jpg" "PositiveNonSocial_emotion_new_group3.jpg" "PositiveNonSocial_neutral_new_group3.jpg" "NegativeNonSocial_emotion_old_group1.jpg" "NegativeNonSocial_neutral_old_group1.jpg" "NegativeNonSocial_emotion_new_group1.jpg" "NegativeNonSocial_neutral_new_group1.jpg" "NegativeNonSocial_emotion_old_group2.jpg" "NegativeNonSocial_neutral_old_group2.jpg" "NegativeNonSocial_emotion_new_group2.jpg" "NegativeNonSocial_neutral_new_group2.jpg" "NegativeNonSocial_emotion_old_group3.jpg" "NegativeNonSocial_neutral_old_group3.jpg" "NegativeNonSocial_emotion_new_group3.jpg" "NegativeNonSocial_neutral_new_group3.jpg" I'm not sure I fully understand the design you have in mind or the logic behind the grouping. Can you give me a concrete example what would constitute a valid selection of stimuli from your listed 48 items, i.e. one that satisfies your constraints? Thanks.
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Dave	Dave posted 7 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	+x Dave - Friday, September 29, 2017 +x jessjones12 - Friday, September 29, 2017 Hi, Question: Is there a function that will allow me to delete subsequent available trials if a specific condition is met? My task: I am trying to create a short recognition memory task (old v. new judgments) in which there are 16 trials (randomized). Each trial will display 1 image pulled randomly from a group of 4. Each group will contain 4 images from the same category: “Old” and contain emotion content "Old” and contain neutral content “New” and contain emotion content “New” and contain neutral content There are 4 categories that each image group belongs to, and 3 groups of 4 images per category (48 images total): positive/social negative/social positive/non-social negative/non-social I need to make sure that out of the 16 trials shown as follows: 8 “old” trials 4 emotion content 1 positive/social 1 negative/social 1 positive/non-social 1 negative/non-social 4 neutral content 1 positive/social 1 negative/social 1 positive/non-social 1 negative/non-social 8 “new” trials 4 emotion content 1 positive/social 1 negative/social 1 positive/non-social 1 negative/non-social 4 neutral content 1 positive/social 1 negative/social 1 positive/non-social 1 negative/non-social My problem: Once an image from a specific group is shown, I want the rest of the group to be eliminated from the available selection pool. I have done this in the past with less complicated constraints by simply using the “/select” and “/resetinterval” attributes, but this has not been working for me with this design. I have also tried functions like “removeitem()”, but because I can only specific the item index and not the specific text in an item list,this creates issues with my item pools when randomizing (what was at index 3 becomes index 2 when the item at index 1 is deleted and so on). “Clearstimulusframes()” does delete the frames from a trial (if I create a single trial for each image), but the trial will still run and simply not display stimuli. If there is a way or function that will allow me to delete subsequent available trials if a specific condition is met, that would be great. Any help would be greatly appreciated. Jess Stimulus pool: "PositiveSocial_emotion_old_group1.jpg" "PositiveSocial_neutral_old_group1.jpg" "PositiveSocial_emotion_new_group1.jpg" "PositiveSocial_neutral_new_group1.jpg" "PositiveSocial_emotion_old_group2.jpg" "PositiveSocial_neutral_old_group2.jpg" "PositiveSocial_emotion_new_group2.jpg" "PositiveSocial_neutral_new_group2.jpg" "PositiveSocial_emotion_old_group3.jpg" "PositiveSocial_neutral_old_group3.jpg" "PositiveSocial_emotion_new_group3.jpg" "PositiveSocial_neutral_new_group3.jpg" "NegativeSocial_emotion_old_group1.jpg" "NegativeSocial_neutral_old_group1.jpg" "NegativeSocial_emotion_new_group1.jpg" "NegativeSocial_neutral_new_group1.jpg" "NegativeSocial_emotion_old_group2.jpg" "NegativeSocial_neutral_old_group2.jpg" "NegativeSocial_emotion_new_group2.jpg" "NegativeSocial_neutral_new_group2.jpg" "NegativeSocial_emotion_old_group3.jpg" "NegativeSocial_neutral_old_group3.jpg" "NegativeSocial_emotion_new_group3.jpg" "NegativeSocial_neutral_new_group3.jpg" "PositiveNonSocial_emotion_old_group1.jpg" "PositiveNonSocial_neutral_old_group1.jpg" "PositiveNonSocial_emotion_new_group1.jpg" "PositiveNonSocial_neutral_new_group1.jpg" "PositiveNonSocial_emotion_old_group2.jpg" "PositiveNonSocial_neutral_old_group2.jpg" "PositiveNonSocial_emotion_new_group2.jpg" "PositiveNonSocial_neutral_new_group2.jpg" "PositiveNonSocial_emotion_old_group3.jpg" "PositiveNonSocial_neutral_old_group3.jpg" "PositiveNonSocial_emotion_new_group3.jpg" "PositiveNonSocial_neutral_new_group3.jpg" "NegativeNonSocial_emotion_old_group1.jpg" "NegativeNonSocial_neutral_old_group1.jpg" "NegativeNonSocial_emotion_new_group1.jpg" "NegativeNonSocial_neutral_new_group1.jpg" "NegativeNonSocial_emotion_old_group2.jpg" "NegativeNonSocial_neutral_old_group2.jpg" "NegativeNonSocial_emotion_new_group2.jpg" "NegativeNonSocial_neutral_new_group2.jpg" "NegativeNonSocial_emotion_old_group3.jpg" "NegativeNonSocial_neutral_old_group3.jpg" "NegativeNonSocial_emotion_new_group3.jpg" "NegativeNonSocial_neutral_new_group3.jpg" I'm not sure I fully understand the design you have in mind or the logic behind the grouping. Can you give me a concrete example what would constitute a valid selection of stimuli from your listed 48 items, i.e. one that satisfies your constraints? Thanks. To elaborate a bit: My big hangup is this: "Once an image from a specific group is shown, I want the rest of the group to be eliminated from the available selection pool. " You seem to have (please correct me if I'm wrong) 12 groups of 4 images each (for a total of 12 x 4 = 48) images. With the above fundamental constraint in place, it seems to me then that you cannot select more than 12 items -- one from each group of four (ignoring any other constraints for the time being). Basically, I'm not quite clear on how to get to 16 trials from there: Wouldn't you require a selection of 16 items?
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jessjones12	jessjones12 posted 7 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 4, Visits: 10	Hi Dave, Apologies for the slow response, I had to double-check with my collaborators. I believe you're correct- there should only be 12 trials total in the real task. Here’s a more concrete example of my issue: Let’s say I want to show participants 4 trials, and each trial will contain 1 image randomly pulled from a group of 4 trials: Trial 1 images: old_emotion_trial1.jpg old_neutral_trial1.jpg new_emotion_trial1.jpg new_neutral_trial1.jpg Trial 2 images: old_emotion_trial2.jpg old_neutral_trial2.jpg new_emotion_trial2.jpg new_neutral_trial2.jpg Trial 3 images: old_emotion_trial3.jpg old_neutral_trial3.jpg new_emotion_trial3.jpg new_neutral_trial3.jpg Trial 4 images: old_emotion_trial4.jpg old_neutral_trial4.jpg new_emotion_trial4.jpg new_neutral_trial4.jpg In each trial, there are two old images and two new images. For each old and new image, there are two versions of the image (emotion-focused and a neutral-focused). Thus, each trial contains 4 different types of images: old/emotion focus, old/neutral focus, new/emotion focus, new/neutral focus. In these 4 trials, I would like for each trial to randomly pull an image from it’s own bucket of 4 images. However, I would like to make sure that each of the 4 image-types (old/emotion focus, old/neutral focus, new/emotion focus, new/neutral focus) are shown at least once throughout my 4 trials. So for example, if trial 1 randomly selects the old/neutral type image (“old_neutral_trial1.jpg”), then trials 2-4 should not randomly choose “old_neutral_trial2.jpg”, “old_neutral_trial3.jpg”, or “old_neutral_trial4.jpg”, respectively, because this would be a repetition of the image type (old/neutral) throughout the trials. Does this help? Essentially, I’ve been unable to figure out how to use expressions/functions to prevent these excessive repetitions (of image types) throughout the real task. Thank you for your help, Jess Edited 7 Years Ago by Dave
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jessjones12	jessjones12 posted 7 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 4, Visits: 10	Hi Dave, Apologies for the slow response, I had to double-check with my collaborators. I believe you're correct- there should only be 12 trials total in the real task. Here’s a more concrete example of my issue: Let’s say I want to show participants 4 trials, and each trial will contain 1 image randomly pulled from a group of 4 trials: Trial 1 images: old_emotion_trial1.jpg old_neutral_trial1.jpg new_emotion_trial1.jpg new_neutral_trial1.jpg Trial 2 images: old_emotion_trial2.jpg old_neutral_trial2.jpg new_emotion_trial2.jpg new_neutral_trial2.jpg Trial 3 images: old_emotion_trial3.jpg old_neutral_trial3.jpg new_emotion_trial3.jpg new_neutral_trial3.jpg Trial 4 images: old_emotion_trial4.jpg old_neutral_trial4.jpg new_emotion_trial4.jpg new_neutral_trial4.jpg In each trial, there are two old images and two new images. For each old and new image, there are two versions of the image (emotion-focused and a neutral-focused). Thus, each trial contains 4 different types of images: old/emotion focus, old/neutral focus, new/emotion focus, new/neutral focus. In these 4 trials, I would like for each trial to randomly pull an image from it’s own bucket of 4 images. However, I would like to make sure that each of the 4 image-types (old/emotion focus, old/neutral focus, new/emotion focus, new/neutral focus) are shown at least once throughout my 4 trials. So for example, if trial 1 randomly selects the old/neutral type image (“old_neutral_trial1.jpg”), then trials 2-4 should not randomly choose “old_neutral_trial2.jpg”, “old_neutral_trial3.jpg”, or “old_neutral_trial4.jpg”, respectively, because this would be a repetition of the image type (old/neutral) throughout the trials. Does this help? Essentially, I’ve been unable to figure out how to use expressions/functions to prevent these excessive repetitions (of image types) throughout the real task. Thank you for your help, Jess
	Reply Like 74
Dave	Dave posted 7 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	+x jessjones12 - Monday, October 2, 2017 Hi Dave, Apologies for the slow response, I had to double-check with my collaborators. I believe you're correct- there should only be 12 trials total in the real task. Here’s a more concrete example of my issue: Let’s say I want to show participants 4 trials, and each trial will contain 1 image randomly pulled from a group of 4 trials: Trial 1 images: old_emotion_trial1.jpg old_neutral_trial1.jpg new_emotion_trial1.jpg new_neutral_trial1.jpg Trial 2 images: old_emotion_trial2.jpg old_neutral_trial2.jpg new_emotion_trial2.jpg new_neutral_trial2.jpg Trial 3 images: old_emotion_trial3.jpg old_neutral_trial3.jpg new_emotion_trial3.jpg new_neutral_trial3.jpg Trial 4 images: old_emotion_trial4.jpg old_neutral_trial4.jpg new_emotion_trial4.jpg new_neutral_trial4.jpg In each trial, there are two old images and two new images. For each old and new image, there are two versions of the image (emotion-focused and a neutral-focused). Thus, each trial contains 4 different types of images: old/emotion focus, old/neutral focus, new/emotion focus, new/neutral focus. In these 4 trials, I would like for each trial to randomly pull an image from it’s own bucket of 4 images. However, I would like to make sure that each of the 4 image-types (old/emotion focus, old/neutral focus, new/emotion focus, new/neutral focus) are shown at least once throughout my 4 trials. So for example, if trial 1 randomly selects the old/neutral type image (“old_neutral_trial1.jpg”), then trials 2-4 should not randomly choose “old_neutral_trial2.jpg”, “old_neutral_trial3.jpg”, or “old_neutral_trial4.jpg”, respectively, because this would be a repetition of the image type (old/neutral) throughout the trials. Does this help? Essentially, I’ve been unable to figure out how to use expressions/functions to prevent these excessive repetitions (of image types) throughout the real task. Thank you for your help, Jess Hi Jess, Thanks for the clarification -- very helpful. Suppose you arrange your items like this: <item myitems> / 1 = "old_emotion_trial1.jpg" / 2 = "old_neutral_trial1.jpg" / 3 = "new_emotion_trial1.jpg" / 4 = "new_neutral_trial1.jpg" / 5 = "old_emotion_trial2.jpg" / 6 = "old_neutral_trial2.jpg" / 7 = "new_emotion_trial2.jpg" / 8 = "new_neutral_trial2.jpg" / 9 = "old_emotion_trial3.jpg" / 10 = "old_neutral_trial3.jpg" / 11 = "new_emotion_trial3.jpg" / 12 = "new_neutral_trial3.jpg" / 13 = "old_emotion_trial4.jpg" / 14 = "old_neutral_trial4.jpg" / 15 = "new_emotion_trial4.jpg" / 16 = "new_neutral_trial4.jpg" </item> What you can do, then, is use <list> elements to randomly select one of the "base" items in the group (#1,#5, #9, #13) <list base> / items = (1,5,9,13) </list> and then another <list> to select one of the items _within_ the group randomly without replacement: <list in_group> / items = (0,1,2,3) </list> Add the two and you get your desired selection across trials: <item myitems> / 1 = "old_emotion_trial1.jpg" / 2 = "old_neutral_trial1.jpg" / 3 = "new_emotion_trial1.jpg" / 4 = "new_neutral_trial1.jpg" / 5 = "old_emotion_trial2.jpg" / 6 = "old_neutral_trial2.jpg" / 7 = "new_emotion_trial2.jpg" / 8 = "new_neutral_trial2.jpg" / 9 = "old_emotion_trial3.jpg" / 10 = "old_neutral_trial3.jpg" / 11 = "new_emotion_trial3.jpg" / 12 = "new_neutral_trial3.jpg" / 13 = "old_emotion_trial4.jpg" / 14 = "old_neutral_trial4.jpg" / 15 = "new_emotion_trial4.jpg" / 16 = "new_neutral_trial4.jpg" </item> <list base> / items = (1,5,9,13) </list> <list ingroup> / items = (0,1,2,3) </list> <text stimulus> / items = myitems / select = values.computeditemnumber </text> <values> / baseitemnumber = 0 / ingroupitemnumber = 0 / computeditemnumber = 0 </values> <trial mytrial> / ontrialbegin = [ values.baseitemnumber = list.base.nextvalue; values.ingroupitemnumber = list.ingroup.nextvalue; values.computeditemnumber = values.baseitemnumber + values.ingroupitemnumber; ] / stimulusframes = [1=stimulus] / validresponse = (57) </trial> <block myblock> / trials = [1-4 = mytrial] </block> Hope this helps!
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jessjones12	jessjones12 posted 7 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 4, Visits: 10	Hi Dave- this solution worked perfectly, thank you for your help!
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