[Rcicr-users] Programming RCP in PsychoPy (Nicholas Michalak)

[Erdem Ozan Meral]

Hi Nicholas Michalak,

I had the same problem when I was trying to create the experiment in
PsychoPy. I couldn't actually completely figure out how to do this, but I
tried something different. I know that this is not what you are intending
to do, and you probably thought of this already but what I did was to
assign locations to pairings before the experiment. For half of the pairs
the original was on the left, and the inv was on the right, for the other
half I did the reverse. I entered the locations in the excel file that I
feed to the PsychoPy. Since PsychoPy was selecting trials in a random order
without replacement, the participants did not see one type of stimulus in
the same location for all the trials.

Again, I know that this is not exactly what you intended to do, but this is
the closest that I could come up with in a short time. If you could find a
better solution I would love to hear that too! I couldn't find a way to do
this in PsychoPy's google groups as well.

It would look like this if you had four pairs in the method that I just
mentioned.

oriimage invimage locationori locationinv
image1.jpg image1_inv.jpg [-0.5,0] [0.5,0]
image2.jpg image2_inv.jpg [-0.5,0] [0.5,0]
image3.jpg image3_inv.jpg [0.5,0] [-0.5,0]
image4.jpg image4_inv.jpg [0.5,0] [-0.5,0]


Best

Erdem Ozan Meral
Boğaziçi University
Department of Psychology
Research & Teaching Assistant
*www.psychology.boun.edu.tr <http://www.psychology.boun.edu.tr/>*


On Fri, May 27, 2016 at 1:00 PM, <
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>    1. Programming RCP in PsychoPy (Nicholas Michalak)
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> Message: 1
> Date: Thu, 26 May 2016 13:23:36 -0400
> From: Nicholas Michalak <nickmm at umich.edu>
> To: "rcicr-users at lists.r-forge.r-project.org"
>         <rcicr-users at lists.r-forge.r-project.org>
> Subject: [Rcicr-users] Programming RCP in PsychoPy
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> Hi all
>
> I've successfully programmed an RCP in Medialab, but I'm trying to
> translate to PsychoPy in Python.
>
> Before I ask my question, is there a rcicr thread on programming an RCP
> experiment in PsychoPy?
>
> If not, I'm having trouble presenting the stimuli pairs (i.e., ori and
> inv) in such a way that participants see each pair in random order (without
> replacement), where the images in a pair are randomly presented on the left
> or the right of the screen.
>
> So if I have 400 pairs and two sides of the screen, I'd want PsychoPy to
> draw from the pairs randomly without replacement and draw within the pairs
> randomly without replacement: present a random stimuli from a random pair
> on the left and place the remaining stimuli from that pair on the right.
>
> I welcome any solutions--thank you!
>
> Nick
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-- 
Erdem Ozan Meral
Boğaziçi University
Department of Psychology
Research & Teaching Assistant
*www.psychology.boun.edu.tr <http://www.psychology.boun.edu.tr/>*
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