Change Blindness Flicker Paradigm
Hello,
I am now conducting a change blindness flicker paradigm and have a few questions to get started.
1 ) First of all how to do I get the displays to flicker/alternate displays in the first place? I have looked through this thread http://forum.cogsci.nl/index.php?p=/discussion/663/open-change-blindness-experiment-with-flicker-paradigm. Do I just copy and paste the script and then it should flicker?
2 ) I am very new to python coding so would like confirmation that with the script attached from what I can make out of it: -
- each alternation will last 10 times before moving on with each display lasting 250 ms?
- participants need to press any key and then it will move on to the next display of images.
-there are only 2 variables defined (img 1 and 2).
for my current experiment I have 96 trials. 48 no change trials, 48 change trials. My IV's are stimuli type (words and images) and change type (congruent and incongruent). The DV's are RT and accuracy. There will also be about 6-8 words or images on each display.
Each display will consist of Fixation marker shown for (250ms) > Image 1 (200ms) > Blank interval (100ms) > Image 2 (200 ms) > Blank interval (100ms) > > Image 1 (200ms) > Blank interval (100ms) > Image 2 (200 ms) etc until the 10 cycles are up or the participant has responded.
3)how do I change the timing of each display + add extra displays on the script?
4) for the script, where it says file pool, do I just add img 3, img 4, etc so that it works for my experiment ?
5) I need separate displays containing either words or images. Is it possible to have words and images randomised in one block or do I need to make a separate blocks and counterbalance?
I'm really sorry about the long post, but I'm really new to python coding and wasn't even aware that I would need it so am kind of stressing out.
Any guidance is appreciated
Thanks
Comments
Hi Renii,
Welcome to the forum!
Based on the amount of questions it might be an idea to do some of the tutorials first. Everything you describe about your paradigm can be achieved with the GUI only, there is no need for python coding (or at least, nothing that absolutely requires it).
The first tutorial already answers quite a few of the questions:
Let me know when you have specific problems you run into, i'm happy to help.
Best,
Laurent