Script 7.5. Skipping parts Demo Experiment Run Experiment

Script 7.5. Skipping parts

Jaap Murre

Skipping the parts a subject has already done

Suppose, your experiment consists of three parts, say two memory tasks followed by a sleep survey. A subject does the memory tasks but then needs to do something else and turns off her computer. Later that day she remembers she still need to finish the survey part, turns her computer back on and surfs back to your experiment. To her great annoyance she has to do the memory tasks again and she decides not to bother with the experiment anymore. How can you prevent this situation?

Annotation with the script

When a subject does this script for the first time, `bookmark` is 0 and the first part will be done. If the subject does task 1 (i.e., press 1) and then closes the webpage, the value of `bookmark` is stored as 1. On opening the experiment again, the usual Landing Page is shown, but now when subject presses the Start button, he or she skips the first part and is now asked to press 2.

If the subject completes the entire experiment and then returns to it later, he or she will start over from the beginning, as a second experimental session will be created with a new subject. The reason is that the system has no way of finding out whether the same person is doing the experiment again or a friend, relative or other person who has access to the same computer. 

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var bookmark = retrieve("Where","subject") || 0;

if (bookmark < 1)
    text("Press '1'"); // dummy task

if (bookmark < 2)
    text("Press '2'"); // dummy task

if (bookmark < 3)
    text("Press '3'"); // dummy task

text("Experiment completed!");

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