Re-visiting Pseudo-Randomization

[Leisha Wharfield]

Brilliant. Thanks, Ben.

Ben Robinson wrote:

> one way to do this, without any scripting, would be to have several lists.
> 1st list: one item - not an X
> 2nd list: 7 items, including your X, selected randomly
> 3rd list: 1 item - not an X
>  
> each of the 3 lists would have the same nested list, call it 
> FontsList, with 4 items in it (32, 72, and two other font sizes).  
> these 4 font sizes would be in a column called FontSize, and items 
> from FontsList would be randomly selected.
>  
> then, within your procedure, the TextDisplay item presenting your 
> stimuli would reference the column [FontSize] such that each presented 
> stimulus would pull a fontsize at random from your FontsList.
>  
> make sense?
>  
> SessionProc
>    List1 (1 item, not an X, with FontsList nested)
>       PresentationProc
>    List2 (7 items, including X, with FontsList nested)
>       PresentationProc
>    List3 (1 item, not an X, with FontsList nested)
>       PresentationProc
>  
> ben robinson
>
> >>> "Mark Chan" <mr.mark.chan at gmail.com> 10/6/2006 12:56 AM >>>
> 'm trying to design a study with Pseudo-Random presentation of stimuli.
>
> Basically this is what i'm looking at:
>
>     * I'll be presenting 9 different objects in 25 blocks
>     * There is a target object, which we will call "X".
>     * I need "X" to appear once within each block
>     * "X" cannot re-appear back to back.
>         i.e. end of block 1, we have... stimuli, stimuli, TARGET,
>       start of block 2 TARGET, stimuli, stimuli...this cannot occur
>     * It would be preferable if there were at least 3 stimuli between
>       TARGET presentation.
>     * We do not wish to have repeats of stimuli and target within each
>       block.
>
> Also, i was wondering if you could have the font sizes change randomly 
> (4 different sizes) between stimuli. Say first stimuli, font = 32, 
> next stimui = 72, etc.
>
> Any ideas?
>
> Thanks!

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