Flashing background at random times

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Flashing background at random times

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Dragos	Dragos posted 5 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 2, Visits: 3	I am trying to modify the Bart script(found at https://www.millisecond.com/download/library/bart/) by having the screen flash red in the init trial. I would like this to happen randomly only in let's say 20 of the 30 times the trial runs. Question is how does one make it so that it does not flash every time, rather a set number of times, and not necessarily all in a row as well? What I have added so far is a simple background shape which flashes in /ontrialbegin in the init trial
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Dave	Dave posted 5 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 105K	+x Dragos - 6/17/2020 I am trying to modify the Bart script(found at https://www.millisecond.com/download/library/bart/) by having the screen flash red in the init trial. I would like this to happen randomly only in let's say 20 of the 30 times the trial runs. Question is how does one make it so that it does not flash every time, rather a set number of times, and not necessarily all in a row as well? What I have added so far is a simple background shape which flashes in /ontrialbegin in the init trial Set up a <list> containing, say, 10 x the value 0 (indicating no flash) and 20 x the value 1 (indicating flash). Sample a value from the list ontrialbegin and store it in a <values> entry. Then insert the flashing shape(s) conditionally /ontrialbegin (if the sample value is 1, insert else do nothing), and /ontrialend perform trial.init.resetstimulusframes().
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Dave	Dave posted 5 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 105K	+x Dave - 6/17/2020 +x Dragos - 6/17/2020 I am trying to modify the Bart script(found at https://www.millisecond.com/download/library/bart/) by having the screen flash red in the init trial. I would like this to happen randomly only in let's say 20 of the 30 times the trial runs. Question is how does one make it so that it does not flash every time, rather a set number of times, and not necessarily all in a row as well? What I have added so far is a simple background shape which flashes in /ontrialbegin in the init trial Set up a <list> containing, say, 10 x the value 0 (indicating no flash) and 20 x the value 1 (indicating flash). Sample a value from the list ontrialbegin and store it in a <values> entry. Then insert the flashing shape(s) conditionally /ontrialbegin (if the sample value is 1, insert else do nothing), and /ontrialend perform trial.init.resetstimulusframes(). Quick example modification attached below. This should give you the general idea. Attachments bart.iqx (256 views, 34.00 KB)
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Dragos	Dragos posted 5 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 2, Visits: 3	+x Dave - 6/17/2020 Sample a value from the list ontrialbegin and store it in a <values> entry. How should I sample at random from the list? I Have added as per your advice the following: <list flashing> / items = (1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0) / replace = false </list> <values> / flashing = 0 </values> <trial init> / ontrialbegin = [ ... values.flashing = list.flashing.? ... ] Also, what do you mean by inserting the shapes? Changing the color from white to red?
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Dave	Dave posted 5 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 105K	+x Dragos - 6/17/2020 +x Dave - 6/17/2020 Sample a value from the list ontrialbegin and store it in a <values> entry. How should I sample at random from the list? I Have added as per your advice the following: <list flashing> / items = (1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0) / replace = false </list> <values> / flashing = 0 </values> <trial init> / ontrialbegin = [ ... values.flashing = list.flashing.? ... ] Also, what do you mean by inserting the shapes? Changing the color from white to red? See the script attached to my previous reply.
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