"Binding" images together

[Michiel Spape]

Hi,
If I understand correctly, what you would ideally want is a way to randomise the NUMBER of presentations (as opposed to, what would be more normal in E-Prime, the ORDER)? You could easily do this with one (or more) lists and the setweight method. That is, if you want to
First present random number of neutral faces
Then present 2 emotional faces 
Then present random number of neutral faces
And you have one List, say List1, you could just enter two levels (one for each of the above), and just before the list, have this small inline:
List1.SetWeight 1, random(1,80)
List1.SetWeight 3, random(1,80)
List1.Reset
Et voila, your first and third level shall be presented a random number (between 1 and 80) of times.
Job done, I think, and probably more elegant than jumping back and forth (as you suggested, which would obviously also be possible).

...unless you want to go back to THE SAME emotional faces, although that could be managed using Attribute:level syntax.
Cheers,
Mich


Michiel Spapé
Research Fellow
Perception & Action group
University of Nottingham
School of Psychology
www.cognitology.eu


-----Original Message-----
From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of Orcasha
Sent: 05 January 2011 09:25
To: E-Prime
Subject: "Binding" images together

Hi,

I'm still quite new to e-prime and am trying to create an experiment
where a constant stream of faces is presented to the participant. The
faces consist of emotionally neutral and emotional expressive faces.

The plan is to have a "train" of neutral faces with a random
presentation of an emotional face and then a second same emotional
face shown directly after then back to the neutral train for x
repeats. So something like: n n n n n n E E n n n n n n E E n n n n n
n n n E E.

While relatively simply in theory, working with the list method is
arduous as (and please correct me if I'm wrong) the presentation
method can't be set to random and keep the double E faces shown
together.

My question then: is it possible to have a random presentation of E
faces during a block while keeping the presentation of the two E faces
together? Is there a way to "bind" them together while "jumping" back
to the n faces after both have been presented or do I need to create a
manual psuedo-random list?

Any comments are appreciated, and thanks in advance.

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