Millisecond Forums

How to know which stimulus was presented to participants

https://forums.millisecond.com/Topic34601.aspx

By linatet - 8/8/2022

Good afternoon,

I ran a study with the following code. The goal was to present 4 different images to participants randomly.

<image wm1>
/items = ("242.jpg")
/position = (55%, 10%)
/imagesize = (25%, 25%)
</image>

<image wm2>
/items = ("009.jpg")
/position = (55%, 10%)
/imagesize = (25%, 25%)
</image>

<image bm1>
/items = ("227.jpg")
/position = (55%, 10%)
/imagesize = (25%, 25%)
</image>

<image bm2>
/items = ("019.jpg")
/position = (55%, 10%)
/imagesize = (25%, 25%)
</image>

<surveypage story>
/ fontstyle = ("Arial", 2.5%, false, false, false, false, 5, 1)
/questions = [1 = story; 2=noreplace(wm1, wm2, bm1, bm2)]
/showpagenumbers = false
/showquestionnumbers = false
/ showbackbutton = false
</surveypage>

From the collected data, how do I know which of the images participants saw on the survey page? Thank yo
By Dave - 8/8/2022

linatet - 8/8/2022
Good afternoon,

I ran a study with the following code. The goal was to present 4 different images to participants randomly.

<image wm1>
/items = ("242.jpg")
/position = (55%, 10%)
/imagesize = (25%, 25%)
</image>

<image wm2>
/items = ("009.jpg")
/position = (55%, 10%)
/imagesize = (25%, 25%)
</image>

<image bm1>
/items = ("227.jpg")
/position = (55%, 10%)
/imagesize = (25%, 25%)
</image>

<image bm2>
/items = ("019.jpg")
/position = (55%, 10%)
/imagesize = (25%, 25%)
</image>

<surveypage story>
/ fontstyle = ("Arial", 2.5%, false, false, false, false, 5, 1)
/questions = [1 = story; 2=noreplace(wm1, wm2, bm1, bm2)]
/showpagenumbers = false
/showquestionnumbers = false
/ showbackbutton = false
</surveypage>

From the collected data, how do I know which of the images participants saw on the survey page? Thank yo

> From the collected data, how do I know which of the images participants saw on the survey page?

If that's the way you set this up, then that information is not logged. You cannot tell from the data you have.
By linatet - 8/8/2022

Is there a line of code I can add to record this information, or do I need to do a separate <expt> for each of the stimulus?
By Dave - 8/8/2022

linatet - 8/8/2022
Is there a line of code I can add to record this information, or do I need to do a separate <expt> for each of the stimulus?

If the type of stimulus -- wm1, wm2, bm1, or bm2 -- paired with the story is supposed to be a between-subjects factor, then yes, you should set up 4 <epxt>s.