Randomization of images

[Michiel Spape]

Hi,
Meltem is quite right, although people usually call it nested lists. Generally, you can go two ways:
1.
Have a set of 20 stimuli selected within a list from a nested list, e.g.
List1: 60 stimuli, attribute myStimuli, set to randomise.
List2: calls List1, and in attribute currentStimulus, set numero uno to [myStimuli:1] to select the first one from List1... after randomisation. The clever thing is that the randomisation of List1 only needs to occur once and you're done. Probably no inline necessary. Whether you've got one or more attributes to call your jpeg isn't important, because they can be concatenated to one. For instance, if we have instead of myStimuli, "aNumber", "leftright", "andsoon" and have a row in the list saying, respectively, "1" "right" "pose.jpg", then this can be combined using another attribute (say, "filename") as [myStimuli]_[leftright]_[andsoon] and eprime will just combine it all.

2.
Code all your stimuli into one array with 60 stimuli, randomizearray, and go from there.

Best,
Mich



Michiel Spapé
Research Fellow
Perception & Action group
University of Nottingham
School of Psychology
www.cognitology.eu

From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of Meltem BALLAN
Sent: 14 October 2011 14:42
To: e-prime at googlegroups.com
Subject: Re: Randomization of images

BTW you can also google it as sub-list e-prime or something like that. I am sure PST forum or this list discussed this or similar topics before.
Meltem
On Fri, Oct 14, 2011 at 9:39 AM, Meltem BALLAN <meltemballan at gmail.com<mailto:meltemballan at gmail.com>> wrote:
Gautam,
I have an idea. You can prepare two lists (one for the right and the left and second for the middle images). Then, you might want to call those files (edit->properties->startup info). Lets say for session 1
 call fileLR and shuffle the list (list properties->order->random).
In order to show 20 models you can count to 20 and jump to the end of session (I would use goto)
repeat it for session 2 including the middle images.
I hope it helps.
Meltem

On Fri, Oct 14, 2011 at 8:56 AM, Gautam Malu <gautam.malu at research.iiit.ac.in<mailto:gautam.malu at research.iiit.ac.in>> wrote:
Hi all,
          i am developing a simple face recognition task.  i am using picture stimuli. I have images of 20 models , 3 images per model so total 3*20 = 60 images.
1_right_pose.jpg
1_left_pose.jpg
1_middle_pose.jpg
 ............................ total 60 images
Experiment consists of 2 phases

 -->1st in learning phase, in which participants will see 2 poses of any 10 models.
i.e total 2*10 = 20 images randomly each images for 3000ms
n_right_pose.jpg
m_left_pose.jpg

.......total 20 images

---> 2nd is testing phase, In which participants will see all 20 model in middle pose, randomly  for 500ms, followed by fixation of infinite duration and during which they have to respond whether or not  they have seen that model in learning phase.
n_middle_pose.jpg
fixation.jpg
...........20 times


now the problem i am facing is how to select 10 random model's both right_pose.jpg and left_pose.jpg and also display them in random order.
how can i get this type of ordering in learning phase
Example
3_right_pose.jpg
7_left_pose.jpg
11_left_pose.jpg
3_left_pose.jpg



Thanks,


----
Gautam Malu

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Meltem Ballan, PhD
Department of Psychiatry, CB# 7160
University of North Carolina School of Medicine
7023 Neurosciences Hospital
Chapel Hill, NC 27599-7160



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Meltem Ballan, PhD
Department of Psychiatry, CB# 7160
University of North Carolina School of Medicine
7023 Neurosciences Hospital
Chapel Hill, NC 27599-7160
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