Problem drawing random images from nested lists

[Abigail Dawson]

I am also wondering whether there is a way to show what trial number the 
participant is on, if the trials have been randomized (so they can know 
when they are halfway through, etc).
 
Thanks again,
Abi

On Monday, February 11, 2013 4:28:38 PM UTC+13, Abigail Dawson wrote:

> Hello,
>  
> I am running a paradigm where I want two images to show side by side on 
> the same slide, one neutral and one either positive or negative, and I want 
> to balance which side the images appear on (e.g. neutral is on the left 
> half the time). In order to do this I have created a slide with 2 slide 
> states, and a trial list with 36 trials, half of those with each slide 
> state, and half of each slide state with "positive" as the "other" image 
> and half with "negative". The images (positive, negative, and neutral) are 
> drawn from three nested lists (neutral has 36 images, positive 18, negative 
> 18).
>  
>  
> My problem is that although every list is set to sample randomly (without 
> replacement), with the full number of samples per cycle (18 or 36), and I 
> have no repeats in my lists, some images are repeating. I have tried it 
> with "reset at the beginning of each run" both checked and unchecked. 
>  
>   
> I tried this originally using only one slide with "leftimage" and 
> "rightimage" as the images, which were specified in the trial list as 
> "posimage", "neutimage", etc, but the same problem occurred.
>  
>  
> Thanks!
> Abi
>

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