Trial/block in randomisation

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Trial/block in randomisation

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SCHAMP	SCHAMP posted 5 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 13, Visits: 37	Hi, We are showing 16 blocks, with 8 images presented in each block (this is the same image shown 8 times). The images are facial expressions shown by a child’s caregiver and a stranger, so that: Block HC = Happy Caregiver. The same image is shown 8 times, before another block is shown in randomized order. For your reference: HS = Happy Stranger FC = Fearful Caregiver FS = Fearful Stranger AC = Anger Caregiver AS = Anger Stranger NC = Neutral Caregiver NS = Neutral Stranger The trial starts with a fixation cross (1000ms), followed by the image (3000ms), and an inter-trial interval (1000ms). We have loop/s now working where we press 1 to initiate a looming ball (to grab attention of child if they are not looking at the screen) and space to initiate a trial. However, our Neutral Stranger block/trials keep playing beyond the 8 times we would like it to be shown. We think that this has to do with the line of code below; however, unsure how to best fix this. Thank you! <trial ITI> / stimulusframes = [1 = picture.fixation] /trialduration = parameters.ITI / ontrialend = [ trial.ITI.resetstimulusframes(); ] /recorddata = false / branch = [ if (script.currentblock== "HC") trial.HC if (script.currentblock =="HS") trial.HS; if (script.currentblock =="AC") trial.AC; if (script.currentblock =="AS") trial.AS; if (script.currentblock =="FC") trial.FC; if (script.currentblock =="FS") trial.FS; if (script.currentblock =="NC") trial.NC; else if (script.currentblock =="NS") trial.NS; ] </trial> <trial blank> / stimulusframes = [1 = picture.blank] /trialduration = parameters.ITI / ontrialend = [ trial.blank.resetstimulusframes(); ] /recorddata = false / branch = [ trial.start ] </trial> <trial start> / validresponse = (20,2) / branch = [ if (trial.start.response == 2) trial.ball else if (trial.start.response == 20) trial.ITI; ] / recorddata = false </trial> <trial ball> / stimulusframes = [1 = video.ballani] / validresponse = (20) / branch = [ trial.start; ] / recorddata = false </trial> Attachments EMG_Ariana_6.iqx (275 views, 15.00 KB)
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Dave	Dave posted 5 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	+x SCHAMP - 9/25/2019 Hi, We are showing 16 blocks, with 8 images presented in each block (this is the same image shown 8 times). The images are facial expressions shown by a child’s caregiver and a stranger, so that: Block HC = Happy Caregiver. The same image is shown 8 times, before another block is shown in randomized order. For your reference: HS = Happy Stranger FC = Fearful Caregiver FS = Fearful Stranger AC = Anger Caregiver AS = Anger Stranger NC = Neutral Caregiver NS = Neutral Stranger The trial starts with a fixation cross (1000ms), followed by the image (3000ms), and an inter-trial interval (1000ms). We have loop/s now working where we press 1 to initiate a looming ball (to grab attention of child if they are not looking at the screen) and space to initiate a trial. However, our Neutral Stranger block/trials keep playing beyond the 8 times we would like it to be shown. We think that this has to do with the line of code below; however, unsure how to best fix this. Thank you! <trial ITI> / stimulusframes = [1 = picture.fixation] /trialduration = parameters.ITI / ontrialend = [ trial.ITI.resetstimulusframes(); ] /recorddata = false / branch = [ if (script.currentblock== "HC") trial.HC if (script.currentblock =="HS") trial.HS; if (script.currentblock =="AC") trial.AC; if (script.currentblock =="AS") trial.AS; if (script.currentblock =="FC") trial.FC; if (script.currentblock =="FS") trial.FS; if (script.currentblock =="NC") trial.NC; else if (script.currentblock =="NS") trial.NS; ] </trial> <trial blank> / stimulusframes = [1 = picture.blank] /trialduration = parameters.ITI / ontrialend = [ trial.blank.resetstimulusframes(); ] /recorddata = false / branch = [ trial.start ] </trial> <trial start> / validresponse = (20,2) / branch = [ if (trial.start.response == 2) trial.ball else if (trial.start.response == 20) trial.ITI; ] / recorddata = false </trial> <trial ball> / stimulusframes = [1 = video.ballani] / validresponse = (20) / branch = [ trial.start; ] / recorddata = false </trial> <trial ITI> / stimulusframes = [1 = picture.fixation] /trialduration = parameters.ITI / ontrialend = [ trial.ITI.resetstimulusframes(); ] /recorddata = false / branch = [ if (script.currentblock== "HC") trial.HC if (script.currentblock =="HS") trial.HS; if (script.currentblock =="AC") trial.AC; if (script.currentblock =="AS") trial.AS; if (script.currentblock =="FC") trial.FC; if (script.currentblock =="FS") trial.FS; if (script.currentblock =="NC") trial.NC; else if (script.currentblock =="NS") trial.NS; ] </trial> The else does not belong and should be removed. Also note, in general, that every instance of <trial HC>, <trial HS>, etc. you invoke via /branch will be in addition to the eight instances you run directly via the <block>: <block NS> / trials = [1-8 = NS] </block> It's entirely unclear to me whether that's what you intended or not. If not, you should not invoke any additional instances via /branch. Edited 5 Years Ago by Dave
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SCHAMP	SCHAMP posted 5 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 13, Visits: 37	Hi Dave, Thank you for your quick response and for alerting us to the how there are additional instances via /branch. We have deleted the else; however, this still results in the NS being displayed repeatedly, regardless of whenever the block is presented in the randomisation sequence. The other blocks (HC, HS, etc.) all display correctly, with the image being presented for a maximum of 8 times (8 trials). Also, when we initiate the looming ball (pressing '1') and then return back to the expt, it correctly pauses and then resumes the block after pressing 't' (initiating trial ITI) for all blocks except NS. We only want the total of trials for all image types to be 8 across the whole experiment, how do I do that? Thank you!
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Dave	Dave posted 5 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	+x SCHAMP - 9/25/2019 Hi Dave, Thank you for your quick response and for alerting us to the how there are additional instances via /branch. We have deleted the else; however, this still results in the NS being displayed repeatedly, regardless of whenever the block is presented in the randomisation sequence. The other blocks (HC, HS, etc.) all display correctly, with the image being presented for a maximum of 8 times (8 trials). Also, when we initiate the looming ball (pressing '1') and then return back to the expt, it correctly pauses and then resumes the block after pressing 't' (initiating trial ITI) for all blocks except NS. We only want the total of trials for all image types to be 8 across the whole experiment, how do I do that? Thank you! As I said, if you only want the 8 trials you've specified directly in the <block> element's trials attribute, you should NOT /branch at all. I.e. all this <trial ITI> / stimulusframes = [1 = text.fixation] /trialduration = parameters.ITI / ontrialend = [ trial.ITI.resetstimulusframes(); ] /recorddata = false / branch = [ if (script.currentblock== "HC") trial.HC if (script.currentblock =="HS") trial.HS; if (script.currentblock =="AC") trial.AC; if (script.currentblock =="AS") trial.AS; if (script.currentblock =="FC") trial.FC; if (script.currentblock =="FS") trial.FS; if (script.currentblock =="NC") trial.NC; if (script.currentblock =="NS") trial.NS; ] </trial> needs to be removed.
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SCHAMP	SCHAMP posted 5 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 13, Visits: 37	Thank you, Dave! This works properly now. Much appreciated
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