![]() For example, say that your sketchpad is called my_sketchpad, and contains an image elements with the name 'my_image'. You can access the Canvas object for a sketchpad as the items canvas property. Presenting visual stimuli in Python inline script Accessing a sketchpad in Python When this option is enabled (it is by default), feedback variables are reset when the feedback item is shown.įor more information about feedback variables, see: The feedback item has an option 'Reset feedback variables'. However, the feedback item should not be used to present time-critical stimuli, because it suffers from delays due to stimulus preparation.įor more information about the prepare-run strategy, see:įeedback variables are (by default) reset by feedback items This makes it possible to provide feedback on things that just happened-hence the name. In contrast, the contents of a feedback item are only prepared when they are actually shown, that is, during the run phase of the sequence that it is part of. For example, you cannot use a sketchpad to provide immediate feedback on the response time collected by a keyboard_response item (assuming that the sketchpad and keyboard_response are part of the same sequence.) However, the downside of this is that the contents of a sketchpad cannot depend on what happens during the sequence that it is part of. This is necessary to ensure accurate timing: It allows the sketchpad to be shown right away during the run phase, without any delays due to stimulus preparation. The contents of a sketchpad are prepared during the prepare phase of the sequence that it is part of. Sketchpad items are prepared in advance, feedback items are not Advanced has been created to take advantage of the power of Acrobat and the Internet. The sketchpad and feedback items are identical in most ways, except for two important differences. Advanced introduces advanced sketching methods, drafting concepts. The difference between sketchpad and feedback items The sketchpad provides built-in drawing tools. The sketchpad and feedback item offer basic what-you-see-is-what-you get drawing tools ( Figure 1).įigure 1. Presenting visual stimuli in Python inline script.Feedback variables are (by default) reset by feedback items.Sketchpad items are prepared in advance, feedback items are not.The difference between sketchpad and feedback items.Installing packages, plugins, and extensions. ![]() ![]() Looping and defining indepedent variables. ![]()
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