Semirandomization of pictures

[LYT]

My apologies, this was entirely unclear. Let me try again:

I will have three identical blocks be played one after the other. Each 
block will contain two lists (Set A, Set B) with 20 pictures per Set. Only 
10 pictures from each of these list will be shown in a block, and within 
each block is a scale that is shown after each picture presentation:

Set A Pictures: 10 
Set B Pictures: 10
Scale (repeated per picture shown)

And I hope to play it such that Block 1 --> Block 2 --> Block 3. 
When doing so, I do not want any one picture to be shown three times 
consecutively within the experiment (i.e., in the three presented blocks).

I hope this helps!
Thank you.
On Friday, February 7, 2014 7:32:33 AM UTC-5, JACanterbury wrote:
>
> i'm not quite clear what you're doing here.
>
> If you only have 2 of each picture in a block, then if you set the 
> triallist to random then you should at most get only 2 in a row, or do the 
> blocks follow immediately on from one another and you're thinking about 
> consecutive pictures across the block boundary?
>
> or perhaps i've missed the point completely :)
>
> On Friday, February 7, 2014 2:06:39 AM UTC, LYT wrote:
>>
>> Hi all,
>>
>> I have an experiment where there are three blocks that each have two sets 
>> of the same pictures. I want to semirandomize the pictures such that no one 
>> picture in either set is shown three times in a row. Does anyone know how 
>> to do this? Please do ask for clarification if I was not clear!
>>
>> Thank you,
>> LYT
>>
>

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