Subjects timing out in Heats and Flowers Task

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Subjects timing out in Heats and Flowers Task

Subjects timing out in Heats and Flowers Task

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ramzadragoon	ramzadragoon posted 8 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 7, Visits: 34	Hello, I have programmed a Hearts and Flowers task, and I am concerned about participant inaccuracy due to lack of response stemming from my programming. Literature says that accuracy on these trials should be about 80% when the response window is 750ms, and we are seeing accuracies of about 60% instead. There should be a 500ms pre-trial pause, a 500ms fixation cross, a 500ms blank screen, and then 750ms stimulus display ("Right")/response window. values.respwindow is set to 750. Here is my code. <trial CongRight> /ontrialbegin = [picture.Right.setitem(picture.heart.currentitem, 1); if (expt.heartsflowers.currentblocknumber != 5) values.score = 0] /stimulustimes = [1 = fixation; 500 = nofix; 1000 = Right] / beginresponsetime = 1000 / inputdevice = keyboard / validresponse = ("q", "p", noresponse) /correctresponse = ("p") /timeout = 1500 + values.respwindow /pretrialpause = 500 /ontrialend = [if (trial.congright.correct) values.score = (values.score + 1)] </trial> The data reflect too many instances of individuals hitting the cap of 750ms response time and missing the trial. Did I do something like use beginresponsetime or timeout incorrectly? Thank you for your help.
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Dave	Dave posted 8 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	+x ramzadragoon - Wednesday, November 09, 2016 Hello, I have programmed a Hearts and Flowers task, and I am concerned about participant inaccuracy due to lack of response stemming from my programming. Literature says that accuracy on these trials should be about 80% when the response window is 750ms, and we are seeing accuracies of about 60% instead. There should be a 500ms pre-trial pause, a 500ms fixation cross, a 500ms blank screen, and then 750ms stimulus display ("Right")/response window. values.respwindow is set to 750. Here is my code. <trial CongRight> /ontrialbegin = [picture.Right.setitem(picture.heart.currentitem, 1); if (expt.heartsflowers.currentblocknumber != 5) values.score = 0] /stimulustimes = [1 = fixation; 500 = nofix; 1000 = Right] / beginresponsetime = 1000 / inputdevice = keyboard / validresponse = ("q", "p", noresponse) /correctresponse = ("p") /timeout = 1500 + values.respwindow /pretrialpause = 500 /ontrialend = [if (trial.congright.correct) values.score = (values.score + 1)] </trial> The data reflect too many instances of individuals hitting the cap of 750ms response time and missing the trial. Did I do something like use beginresponsetime or timeout incorrectly? Thank you for your help. Your code is correct. Participants have a total of 750ms to respond once the "Right" stimulus appears on-screen. Assuming the other relevant <trial> elements are set up identically, the data you are seeing reflects actual participant (under)performance and is not an artifact of some programming mistake.
	Reply Like 37
ramzadragoon	ramzadragoon posted 8 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 7, Visits: 34	+x Dave - Wednesday, November 09, 2016 +x ramzadragoon - Wednesday, November 09, 2016 Hello, I have programmed a Hearts and Flowers task, and I am concerned about participant inaccuracy due to lack of response stemming from my programming. Literature says that accuracy on these trials should be about 80% when the response window is 750ms, and we are seeing accuracies of about 60% instead. There should be a 500ms pre-trial pause, a 500ms fixation cross, a 500ms blank screen, and then 750ms stimulus display ("Right")/response window. values.respwindow is set to 750. Here is my code. <trial CongRight> /ontrialbegin = [picture.Right.setitem(picture.heart.currentitem, 1); if (expt.heartsflowers.currentblocknumber != 5) values.score = 0] /stimulustimes = [1 = fixation; 500 = nofix; 1000 = Right] / beginresponsetime = 1000 / inputdevice = keyboard / validresponse = ("q", "p", noresponse) /correctresponse = ("p") /timeout = 1500 + values.respwindow /pretrialpause = 500 /ontrialend = [if (trial.congright.correct) values.score = (values.score + 1)] </trial> The data reflect too many instances of individuals hitting the cap of 750ms response time and missing the trial. Did I do something like use beginresponsetime or timeout incorrectly? Thank you for your help. Your code is correct. Participants have a total of 750ms to respond once the "Right" stimulus appears on-screen. Assuming the other relevant <trial> elements are set up identically, the data you are seeing reflects actual participant (under)performance and is not an artifact of some programming mistake. What a relief! Thank you so much for your quick response!
	Reply Like 36