Saving randomized stimuli for reuse

lir1995 — Thu, 14 Nov 2024 21:09:02 GMT

Hi,

I have an experiment where I have faces and scenes paired together. The pairing of the two are random, and should be random initially. However, participants will then need to see the same face-scene pair again later in the experiment. For instance, trials 1-4 could be four trial unique pairs, but trials 5-8 should be the repeats of trials 1-4 in a random order.

How do I save this random pair so that participants can learn these pairings?

Here is code I have so far.

************
Import Faces
************
<item Face>
/ 1 = "Faces/1.jpg"
/ 2 = "Faces/2.jpg"
/ 3 = "Faces/3.jpg"
/ 4 = "Faces/4.jpg"
</item>

*************
Locate Scenes
*************
<include>
/ precondition = [mod(script.subjectid,6) == 1]
/ file = "scene_files_test/all1.txt"
</include>

****************
Picture Elements
****************
<picture face_pictured_2>
/ items = Face
/ position = (27%, 50%)
/ size = (50%, 50%)
</picture>
# one face and one scene next to each other (second part)

<picture scene1_display>
/ items = everything
/ position = (70%, 50%)
/ size = (50%, 50%)
</picture>
#for the scenes in the second part

***************
Creating Trials
***************
<trial Face_and_Scene>
/ stimulustimes = [
0 = face_pictured_2;
0 = scene1_display;
]
/ timeout = 5000
/ validresponse = ("1", "2", "3")
/ inputdevice = keyboard
</trial>
# one face and one scene next to each other (second part)

***************
Creating Blocks
***************
<block Study>
/ trials = [1-4 = Face_and_Scene]
</block>

Any help is greatly appreciated!!

RE: Saving randomized stimuli for reuse

Dave — Thu, 14 Nov 2024 21:09:02 GMT

+x[quote]

[b]lir1995 - 11/14/2024[/b]
Hi,

I have an experiment where I have faces and scenes paired together. The pairing of the two are random, and should be random initially. However, participants will then need to see the same face-scene pair again later in the experiment. For instance, trials 1-4 could be four trial unique pairs, but trials 5-8 should be the repeats of trials 1-4 in a random order.

How do I save this random pair so that participants can learn these pairings?

Here is code I have so far.

************
Import Faces
************
<item Face>
/ 1 = "Faces/1.jpg"
/ 2 = "Faces/2.jpg"
/ 3 = "Faces/3.jpg"
/ 4 = "Faces/4.jpg"
</item>

*************
Locate Scenes
*************
<include>
/ precondition = [mod(script.subjectid,6) == 1]
/ file = "scene_files_test/all1.txt"
</include>

****************
Picture Elements
****************
<picture face_pictured_2>
/ items = Face
/ position = (27%, 50%)
/ size = (50%, 50%)
</picture>
# one face and one scene next to each other (second part)

<picture scene1_display>
/ items = everything
/ position = (70%, 50%)
/ size = (50%, 50%)
</picture>
#for the scenes in the second part

***************
Creating Trials
***************
<trial Face_and_Scene>
/ stimulustimes = [
0 = face_pictured_2;
0 = scene1_display;
]
/ timeout = 5000
/ validresponse = ("1", "2", "3")
/ inputdevice = keyboard
</trial>
# one face and one scene next to each other (second part)

***************
Creating Blocks
***************
<block Study>
/ trials = [1-4 = Face_and_Scene]
</block>

Any help is greatly appreciated!!
[/quote]

This question has been asked and answered numerous times. You can find previous examples via search.

See e.g. https://forums.millisecond.com/Topic16276.aspx

Millisecond Forums » Millisecond Forums » Inquisit 6 » Saving randomized stimuli for reuse

Saving randomized stimuli for reuse

RE: Saving randomized stimuli for reuse