clarification on counterbalancing question

[LoCasto, Paul C. Prof.]

Hello all-

 

I see I might have been unclear in my original post- I apologize. I am
aware of being able to create a number of lists- and for each list
counterbalance stimuli manually i.e:

 

List 1= 1a, 2b, 3c, 4a, 5b, 6c,

List 2= 1b, 2c, 3a, 4b, 5c, 6a

List 3= 1c, 2a, 3b, 4c, 5a, 6b

 

and then at the Block level have E-prime choose to present one of these
lists using the counterbalance display option. However, unless I
manufacture each possible list sequence this is really pseudorandom in
that anyone who sees stimulus 1a, will also see stimulus 4a and 5b etc. 

 

Would someone be so kind as to tell me how I might list my stimuli in a
way that has E-prime *randomly* select whether a Ss sees version 'a',
'b', 'c' of a given stimulus and across the whole experiment would see
an equal number of stimuli across the three conditions (a, b, c) where
no stimulus (e.g. stimulus 1)  was seen in more than one version (e.g.
1a *or* 1b *or* 1c). 

 

I would really appreciate any insight you can afford. Thanks.

 

 

Paul

 

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