InstantForum 2017-1 FinalMillisecond Forumshttps://forums.millisecond.com/Millisecond ForumsFri, 25 Sep 2026 16:32:14 GMT20https://forums.millisecond.com/Topic20070.aspxHello,<br/><br/>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.<br/><br/><br/>There should be a 500ms pre-trial pause, a 500ms fixation cross, a 500ms blank screen, and then 750ms stimulus display ("Right")/response &#119;indow.<br/>values.respwindow is set to 750.<br/><br/><br/>Here is my code.&nbsp;<br/><br/>&lt;trial CongRight&gt;<br/>/ontrialbegin = [picture.Right.setitem(picture.heart.currentitem, 1); if (expt.heartsflowers.currentblocknumber != 5) values.score = 0]<br/>/stimulustimes = [1 = fixation; 500 = nofix; 1000 = Right]<br/>/ beginresponsetime = 1000<br/>/ inputdevice = keyboard<br/>/ validresponse = ("q", "p", noresponse)<br/>/correctresponse = ("p")<br/>/timeout = 1500 + values.respwindow<br/>/pretrialpause = 500<br/>/ontrialend = [if (trial.congright.correct) values.score = (values.score + 1)]<br/>&lt;/trial&gt;<br/><br/>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?<br/><br/>Thank you for your help.Wed, 09 Nov 2016 09:53:37 GMTramzadragoonhttps://forums.millisecond.com/Topic20073.aspx<div data-id="20071" class="if-quote-wrapper" unselectable="on" data-guid="1478713982713"><a class="quote-para" unselectable="on" style="display: none;" href="#" data-id="20071" title="Move Cursor Below" contenteditable="false"><span unselectable="on">+</span></a><a class="quote-delete" unselectable="on" style="display: none;" href="#" data-id="20071" title="Delete Quote" contenteditable="false"><span unselectable="on">x</span></a><span unselectable="on" class="quote-markup">[quote]</span><div unselectable="on" class="if-quote-header" contenteditable="false"><div unselectable="on" class="if-quote-toggle-wrapper"><a class="if-quote-toggle quote-link" href="#" data-id="20071" title=" "></a></div><span unselectable="on" class="quote-markup">[b]</span>Dave - Wednesday, November 09, 2016<span unselectable="on" class="quote-markup">[/b]</span></div><div class="if-quote-message if-quote-message-20071"><div class="if-quote-message-margin"><div data-id="20070" class="if-quote-wrapper" unselectable="on" data-guid="1478713982713"><a class="quote-para" unselectable="on" style="display: none;" href="#" data-id="20070" title="Move Cursor Below" contenteditable="false"><span unselectable="on">+</span></a><a class="quote-delete" unselectable="on" style="display: none;" href="#" data-id="20070" title="Delete Quote" contenteditable="false"><span unselectable="on">x</span></a><span unselectable="on" class="quote-markup">[quote]</span><div unselectable="on" class="if-quote-header" contenteditable="false"><div unselectable="on" class="if-quote-toggle-wrapper"><a class="if-quote-toggle quote-link" href="#" data-id="20070" title=" "></a></div><span unselectable="on" class="quote-markup">[b]</span>ramzadragoon - Wednesday, November 09, 2016<span unselectable="on" class="quote-markup">[/b]</span></div><div class="if-quote-message if-quote-message-20070"><div class="if-quote-message-margin">Hello,<br/><br/>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.<br/><br/><br/>There should be a 500ms pre-trial pause, a 500ms fixation cross, a 500ms blank screen, and then 750ms stimulus display ("Right")/response &#119;indow.<br/>values.respwindow is set to 750.<br/><br/><br/>Here is my code.&nbsp;<br/><br/>&lt;trial CongRight&gt;<br/>/ontrialbegin = [picture.Right.setitem(picture.heart.currentitem, 1); if (expt.heartsflowers.currentblocknumber != 5) values.score = 0]<br/>/stimulustimes = [1 = fixation; 500 = nofix; 1000 = Right]<br/>/ beginresponsetime = 1000<br/>/ inputdevice = keyboard<br/>/ validresponse = ("q", "p", noresponse)<br/>/correctresponse = ("p")<br/>/timeout = 1500 + values.respwindow<br/>/pretrialpause = 500<br/>/ontrialend = [if (trial.congright.correct) values.score = (values.score + 1)]<br/>&lt;/trial&gt;<br/><br/>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?<br/><br/>Thank you for your help.<a class="if-quote-goto quote-link" href="#" data-id="20070"><span class="goto"></span></a></div></div><span class="quote-markup">[/quote]</span></div><br/>Your code is correct. Participants have a total of 750ms to respond once the "Right" stimulus appears on-screen. Assuming the other relevant &lt;trial&gt; elements are set up identically, the data you are seeing reflects actual participant (under)performance and is not an artifact of some programming mistake.<br/><a class="if-quote-goto quote-link" href="#" data-id="20071"><span class="goto"></span></a></div></div><span class="quote-markup">[/quote]</span></div><br/>What a relief! Thank you so much for your quick response!Wed, 09 Nov 2016 09:53:37 GMTramzadragoonhttps://forums.millisecond.com/Topic20071.aspx<div data-id="20070" class="if-quote-wrapper" unselectable="on" data-guid="1478708292596"><a class="quote-para" unselectable="on" style="display: none;" href="#" data-id="20070" title="Move Cursor Below" contenteditable="false"><span unselectable="on">+</span></a><a class="quote-delete" unselectable="on" style="display: none;" href="#" data-id="20070" title="Delete Quote" contenteditable="false"><span unselectable="on">x</span></a><span unselectable="on" class="quote-markup">[quote]</span><div unselectable="on" class="if-quote-header" contenteditable="false"><div unselectable="on" class="if-quote-toggle-wrapper"><a class="if-quote-toggle quote-link" href="#" data-id="20070" title=" "></a></div><span unselectable="on" class="quote-markup">[b]</span>ramzadragoon - Wednesday, November 09, 2016<span unselectable="on" class="quote-markup">[/b]</span></div><div class="if-quote-message if-quote-message-20070"><div class="if-quote-message-margin">Hello,<br/><br/>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.<br/><br/><br/>There should be a 500ms pre-trial pause, a 500ms fixation cross, a 500ms blank screen, and then 750ms stimulus display ("Right")/response window.<br/>values.respwindow is set to 750.<br/><br/><br/>Here is my code.&nbsp;<br/><br/>&lt;trial CongRight&gt;<br/>/ontrialbegin = [picture.Right.setitem(picture.heart.currentitem, 1); if (expt.heartsflowers.currentblocknumber != 5) values.score = 0]<br/>/stimulustimes = [1 = fixation; 500 = nofix; 1000 = Right]<br/>/ beginresponsetime = 1000<br/>/ inputdevice = keyboard<br/>/ validresponse = ("q", "p", noresponse)<br/>/correctresponse = ("p")<br/>/timeout = 1500 + values.respwindow<br/>/pretrialpause = 500<br/>/ontrialend = [if (trial.congright.correct) values.score = (values.score + 1)]<br/>&lt;/trial&gt;<br/><br/>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?<br/><br/>Thank you for your help.<a class="if-quote-goto quote-link" href="#" data-id="20070"><span class="goto"></span></a></div></div><span class="quote-markup">[/quote]</span></div><br/>Your code is correct. Participants have a total of 750ms to respond once the "Right" stimulus appears on-screen. Assuming the other relevant &lt;trial&gt; elements are set up identically, the data you are seeing reflects actual participant (under)performance and is not an artifact of some programming mistake.<br/>Wed, 09 Nov 2016 08:22:35 GMTDave