I am currently running a dot probe task with visual paired stimuli (positive, negative). I have a two fold question pertaining to this task:<div><br></div><div>1) I have about 60 images in one of my trialprocs, and was therefore advised to use the canvas option to preload images. I have had little success with using this object, particularly because I do not entirely understand the concepts of off-screen and on-screen canvas. I have managed to write a small script with help from the references guides posted on the e-prime website (as well as forums), but am stuck when it comes to the following statement:</div><div><br></div><div><p class="MsoBodyText2" style="margin-top:0in;margin-right:.25in;margin-bottom:
0in;margin-left:.25in;margin-bottom:.0001pt;text-indent:-.25in;mso-list:l10 level1 lfo23;
tab-stops:list .25in"><!--[if !supportLists]-->1.<span style="font-size: 7pt; line-height: normal; font-family: 'Times New Roman'; ">
</span><!--[endif]-->When preparing the trial:</p>
<p class="MsoBodyText2"><span style="font-size:10.0pt"><!--[if !supportEmptyParas]--> <!--[endif]--><o:p></o:p></span></p>
<p class="MsoBodyText2" style="margin-left:.25in"><span style="font-size:10.0pt;
font-family:"Courier New"">targetCanvas.LoadImage stim <o:p></o:p></span></p>
<p class="MsoBodyText2" style="margin-left:.25in"><span style="font-size:10.0pt;
font-family:"Courier New""><!--[if !supportEmptyParas]--> <!--[endif]--><o:p></o:p></span></p>
<p class="MsoBodyText2"><b>Image is loaded to the top left corner. We need to define
2 Rect Objects: StimLoadRect and StimRect (see Rect object in the E-Basic
Help), both the size of the images to-be-loaded, but the StimRect at the
(Left,Right, Top,Bottom) coordinates where the stimulus will be displayed. When
we copy the image from the offline canvas to the online canvas, we will copy
from StimLoadRect to StimRect.</b><span dir="RTL"></span><span lang="HE" dir="RTL"><span dir="RTL"></span><o:p></o:p></span></p>
<p class="MsoBodyText2"><span dir="LTR"></span><span style="font-size:10.0pt"><!--[if !supportEmptyParas]--> <!--[endif]--><span dir="LTR"></span><o:p></o:p></span></p>
<p class="MsoBodyText2" style="margin-top:0in;margin-right:.25in;margin-bottom:
0in;margin-left:.25in;margin-bottom:.0001pt;text-indent:-.25in;mso-list:l10 level1 lfo23;
tab-stops:list .25in"><!--[if !supportLists]-->2.<span style="font-size: 7pt; line-height: normal; font-family: 'Times New Roman'; ">
</span><!--[endif]-->To run the stimulus:</p>
<p class="MsoBodyText2" style="margin-left:.5in"><span style="font-size:10.0pt;
font-family:"Courier New""><!--[if !supportEmptyParas]--> <!--[endif]--><o:p></o:p></span></p>
<p class="MsoBodyText2" style="margin-left:.5in"><span style="font-size:10.0pt;
font-family:"Courier New"">Display.WaitForVerticalBlank<o:p></o:p></span></p>
<p class="MsoBodyText2" style="margin-left:.5in"><span style="font-size:10.0pt;
font-family:"Courier New"">c.setAttrib "StimOnset", clock.read<o:p></o:p></span></p>
<p class="MsoBodyText2" style="margin-left:.5in"><span style="font-size:10.0pt;
font-family:"Courier New"">cnvs.copy targetCanvas, stimLoadRect, stimRect<o:p></o:p></span></p>
<p class="MsoBodyText2" style="margin-left:.5in"><span style="font-size:10.0pt;
font-family:"Courier New"">sleep(stimDuration)<o:p></o:p></span></p>
<p class="MsoBodyText2" style="margin-left:.5in"><span style="font-size:10.0pt;
font-family:"Courier New"">Display.WaitForVerticalBlank<o:p></o:p></span></p>
<p class="MsoBodyText2" style="margin-left:.5in"><span style="font-size:10.0pt;
font-family:"Courier New"">Cnvs.clear ' or something else that erases the
stimulus, can be done in the following trial<o:p></o:p></span></p>
<p class="MsoBodyText2" style="margin-left:.5in"><span style="font-size:10.0pt;
font-family:"Courier New""><!--[if !supportEmptyParas]--> </span></p><p class="MsoBodyText2" style="margin-left:.5in"><font face="arial, sans-serif" size="2"><b>Bolded lines: </b>How do I create a stimLoadRect and stimRect image, a is asked for? (I did find a script for creating a rect object, but am unsure of how to specify dimensions).</font></p><p class="MsoBodyText2" style="margin-left:.5in"><font face="arial, sans-serif" size="2">I assume that pre-defining images and their locations, means I do not have to specify them as a SlideObject? (I am guessing I am completely wrong here - please feel free to correct me) . I would also assume that the stimDuration, must be defined as an attribute? </font></p><p class="MsoBodyText2" style="margin-left:.5in"><font face="arial, sans-serif" size="2"> </font></p><p class="MsoBodyText2" style="margin-left:.5in"><font face="arial, sans-serif" size="2">Assuming I do not have to go through this convoluted path, I have another question. If I could pre-load using the SlideImage and ImageDisplay options, I am not sure how to specify the co-ordinates of where I want my image to be in the properties section. I know this appears elementary, but the actual size of the images are 424 X 283, but when running, part of the images are cut off. When I looked at the properties of my slide object, I had set the width at 25% . I assumed this was the co-ordinate location in relation to the actual screen size. Guessing that this was an error on my part, I reset the width to 100%, but that meant that when I looked at the slideobject (with the dotted grid), one image seemed to complete cover the other image. How do I fit both images, and make sure their dimensions remain the same?</font></p><p class="MsoBodyText2" style="margin-left:.5in"><font face="arial, sans-serif" size="2"><br></font></p><p class="MsoBodyText2" style="margin-left:.5in"><font face="arial, sans-serif" size="2">I apologize for this rant. I only recently switched to e-prime from using Inquisit, and am still trying to get a hang of this software tool.</font></p><p class="MsoBodyText2" style="margin-left:.5in"><font face="arial, sans-serif" size="2"><br></font></p><p class="MsoBodyText2" style="margin-left:.5in"><font face="arial, sans-serif" size="2">Thanks a ton for your reply,</font></p><p class="MsoBodyText2" style="margin-left:.5in"><font face="arial, sans-serif" size="2">Corona</font></p></div>
<p></p>
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