I am trying to program an experiment in E Prime and was wondering if you had any tips/examples to help me out. <br><br>What I am trying to do is have subjects indicate their confidence in their response by the length of time they press the response button. While they are pressing the button we would like to present a visual cue (e.g. a growing bar or changing color) indicating the length of the button press. This visual cue should stop changing as soon as they release the button and then should remain stable until the end of the trial period.<br>
<br>Attached is a mini-experiment in which I have gotten the color of the stimuli to change (adapted from the example given here) and then remain stable until the end of the trial period. But I have three remaining issues that I would appreciate help on. First, the stimuli should only start changing colors when the response button is pressed. So I need to have the stimuli appear, as soon as the button is pressed it changes color, and then when it is released it remains that color for the remainder of the trial. Second, I need the total trial time to be 2500 ms including stimulus appearance, change in color as the button is pressed, and as the stimulus remains stable until the end of the trial period. The code I have added in Inline3 (c.setAttrib "Dur", 2500-(ResponseTime-Slide1Time) does not appear to work properly as it sometimes results in very high values (e.g. Dur=5000 ms) or negative values (e.g. Dur=-500 ms). Third, I need to log the time when the response button was pressed and when it was released to get a measure of how long the button was pressed.<br clear="all">
<br>-- <br>Erika Nyhus, Ph.D.<br>Cognitive, Linguistic, and Psychological Sciences<div><span style="font-family: arial,sans-serif; font-size: 13px; border-collapse: collapse;"><div>Brown University </div>229 Waterman St. <div>
<div>Providence, RI 02912-1821</div></div></span></div><br>
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