MMN Experiment, No repeating deviants

[Heather Green]

Thank you so much.  This was extraordinarily helpful.  I'll let you know
how it goes!


On Fri, Feb 7, 2014 at 11:35 AM, David McFarlane <mcfarla9 at msu.edu> wrote:

> 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 )
>
> /----
> Stock reminder:  1) I do not work for PST.  2) PST's trained staff take
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> respond to all requests in 24-48 hours, so make full use of it.  3) In
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> PST staff, please extend the courtesy of posting their reply back here for
> the sake of others.
> \----
>
>
> 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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-- 
Heather Green, M.S., CCC-SLP/L
Neurocognition of Language Lab
Teachers College, Columbia University
525 W 120th Street
New York, New York 10027-6696

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