MMN Experiment, No repeating deviants

[David McFarlane]

Heather,

For complex randomization designs, the easiest fix is just to create 
one or more suitable sequences outside of E-Prime (e.g., Excel), and 
then use any of those sequences in an E-Prime List set to run in 
Sequential order.

If you really want E-Prime to do this "on the fly", then things get a 
lot trickier.  You could start with the "No Repeats on Consecutive 
Trials" examples on the PST website (those use an inefficient and 
nondeterministic "bogosort" method, see 
http://en.wikipedia.org/wiki/Bogosort ).  I have explored more 
efficient & deterministic methods for this sort of thing, but as I 
say it gets tricky to do it right, and I have never implemented these 
in E-Prime.

For more discussion about these types of problems, please search this 
Google Group, and the PST Forum (http://www.pstnet.com/forum/ ), with 
terms such as "random", "pseudorandom", "pseudo-random", "constrain", 
and "constraint".

-----
David McFarlane
E-Prime training 
online:  http://psychology.msu.edu/Workshops_Courses/eprime.aspx
Twitter:  @EPrimeMaster (https://twitter.com/EPrimeMaster )

/----
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At 2/5/2014 10:30 AM Wednesday, Heather Green wrote:
>I am trying to program an Eprime experiment that presents a standard 
>sound 80% of the time and a deviant sound 20% of the time.  The 
>presentation of the sounds has to be random but I want to insure 
>that at least two standards occur before every deviant and that no 
>deviants are presented consecutively.  I know that it can be done 
>because I have seen articles in which the authors report doing just 
>that using Eprime only I haven't been able to figure it out.  Any 
>advice would be appreciated.
>
>Thanks!
>Heather

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