Sharing of Rating Task

[Jordan Axt]

Hello Minno Group - 

I am looking to create a study where one task involves rating pairs of images. Specifically, we have 24 subcategories of images (each with around 20 images), and we need to randomly select one image from each category for each participant. 

Then, with those 24 selected images, we need to repeatedly show the participant two images at a time. On each trial, they will see two images and provide a rating of how similar they are. They will repeat this for every possible pairwise comparison, in a random order, for a total of 276 trials. 

If anyone has an existing task that has some components of the above (randomly selecting from a pool of images, making all possible pairwise comparisons across images, etc.) I would be really grateful if you could share it with me as a starting point. Thank you and let me know if you need any other information from me!

Jordan Axt

jorda...@gmail.com 

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Jordan Axt

Website

[Yoav Bar-Anan]

Hi Jordan,

I can’t remember showing two photos and asking a question about them, so I don’t have highly relevant examples. But here are a few examples that might help.

In this task (from this study), I showed participants pairs of photos. However, rather than rating how similar they are, participants clicked on the person they liked more.

Another example (showfiles, launch, script) from my lab implemented a scale-response rating using miTime (i.e., the Time-Sensitive Tasks component). It includes both a speeded-response block and a non-speeded response block. So, you only need to show two photos, and handle the selection of pairs, for your task.

Both of these examples used miTime, but it may be easier to handle in miQuest. You probably already have examples for showing images in a questionnaire, but here is another (from this study). Showing two images is simply a matter of adding another <image> object to the html.

For choosing photos randomly from a larger pool, you can see the manager file in this study, in which Noga selected 8, 72, and 36 photos from 648 photos (named p1.jpg to p648.jpg).
A more simple code for selecting one text item from a list of items can be found here:

    global.oTarget = API.shuffle(['old_a','old_b','old_c','old_d','old_e','old_f'])[0];

Of course, feel free to post more questions when the study is being programmed.

All the best,
Yoav

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