"Binding" images together

[Orcasha]

Hi Michiel,

Thanks for getting back to me so quickly.

If I understand the code correctly, this will show a random amount of
neutral faces, then the two emotional faces (the second possibly being
shown a random amount of times too?) then resetting back to neutral
faces. But this seems only deals with a single set of emotional faces
then going back to the neutral face. The problem comes as I want to
use 5 randomly selected paired emotional faces (sad + sad, happy +
happy etc) then a random number of neutral faces, and after each face
presentation have a blank screen come up (and I apologise for not
being as indepth about the method in my earlier post).

So a more accurate way of explaining it would be (n = neutral, b =
blank, E(x) = emotion): n b n b n b n b n b n b E1 b E1 b n b n b n b
n b E2 b E2 b n b n b n...

When I try doing a method similar to yours it doesn't always go back
to the neutral for random presentation but sometimes has two lots of
emotional pairs running back to back. So the revised question is: How
can I create a protocol that allows me to go back to a random number
of neutral faces, but prevents E pairs from occasionally being
presented consecutively?

Thanks again.

On Jan 5, 9:27 pm, Michiel Spape <Michiel.Sp... at nottingham.ac.uk>
wrote:
> 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 Psychologywww.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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