Randomize Conditions in a "mere exposure effect /Perceptual fluency" Experiment

[David McFarlane]

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really does like to take any and all questions at 
http://support.pstnet.com/e%2Dprime/support/login.asp , and they 
strive to respond to all requests in 24-48 hours.  So don't be shy 
there.  3) If you do get an answer from PST Web Support, please 
extend the courtesy of posting their reply back here for the sake of others.

That said, here is my take ...

By "randomize ... different exposure frequency" I suppose you mean 
you want to control the List Weights for the different trials in your 
trial List.  In that case, I see two approaches:

1) If you have a small number of sets of Weight assignments, then 
make a separate List for each set of weights.  Enclose each List in 
its own Procedure.  Then use each of those Procedures in a different 
row of an outer block List, and set that List to random order, etc.

2) Otherwise, adjust the List Weights directly from inline code using 
List.SetWeight and List.Reset.  For more information on that, look in 
the online E-Basic Help, and search this Group and the PST Forum 
using terms like "setweight".

And once again, do not neglect PST Web Support 
(http://support.pstnet.com/e%2Dprime/support/login.asp ), that's what 
it is for.

-- David McFarlane, Professional Faultfinder
"For a successful technology, reality must take precedence over 
public relations, for nature cannot be fooled."  (Richard Feynman, 
Nobel prize-winning physicist)


At 3/18/2010 08:32 PM Thursday, you wrote:
>Thanks for this group, here I have find a lot of stuff and want to
>thanks also Michiel Spape for his very nice PDF on Eprime...
>
>I finally write this message because I give up... it's nearly 01:00
>and now I'm looking for help because I feel blind...
>
>I'm putting together an experiment about "mere exposure paradigm"/
>Zajonc stuff... In a first part, I just want to expose 8 stimuli with
>4 different exposure frequency (1/3/6/9)...  I want to randomize both
>the order of presentation and the different exposure frequency...
>
>It's a intrasubject experiment and the most important is to random the
>assignment of stimuli to exposure frequency conditions.    I'm trying
>to do this through nested lists, and have successfully randomized the
>order of stimuli, but am stumped on how to randomize stimuli to the
>different frequency exposure.  It seems like it shouldn't be that
>hard, and maybe I'm just being dense, but I can't figure it out.
>Anyone have any ideas?
>
>I try something with the nested list but can't figure how I can do to
>random the frequency.
>
>In the second part, I would like to expose each 8 stimuli one by one
>to measure the attitude toward it so I need to know for each subject
>wich stimuli have been randomized on frequency.

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