Cyberball task question

[Ananth Narayanan]

Dear E-Prime experts, 

Me and my colleague are trying to get the cyberball task running for an Autism fMRI study. We have the E-Prime file for it (attached), and we are trying to modify it, but we have run into some problems. There are three "throw" lists in this tasks, lets label them throw 1A (17 throws), throw 1B (17 throws) and throw 1C (24 throws, exclusion after ~7 throws). 

Firstly, my colleague and I are not able to figure out where the number of throws in each throw list is set. We need to change this to get more statistical power. 

Secondly, we can only see that there are throws from player 1 to player 2 on the list (ListBasicThrows), even though there are other throws on the list. Where are the other throws listed? By other throws, I mean the following:

player 1 to player 3

player 2 to player 1

player 2 to player 3

player 3 to player 1

player 3 to player 2

We would greatly appreciate it if someone would elucidate how these two parameters are programmed into the paradigm. Thank you. 

'Sincerely,

- Ananth

[Cognitology]

Hi Ananth,

Sorry, bit late. Did you get any further than this? I’m not expert on cyberballing myself, but I do understand that you could try Tutorial VIII “The cyberball game” from our E-Primer. There’s actually a step-by-step instruction on how to make one.

Best,

Michiel

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[Ananth Narayanan]

Hi,

Thank you for your response. We do have the E-Primer, but that shows how to do it using videos. We have .bmp files. I will try to do it from scratch by downloading the videos. Thank you again, for your hint.

But I'd really like to know the answers to the questions I posted above. I would greatly appreciate if anyone knowledgeable about the Cyberball task would respond to my queries. Thank you.

'Sincerely,

- Ananth

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[Cognitology]

Hi,

Wow, somebody who has it J.

 

As for answers to the questions: the issue is that I would love to help, but in order to understand the problem, I would have to understand the parameters, for which I need to extract your experiment and take at least one hour, which is more than I’m willing to spend given other urgent matters. If you think it’s something a cyberball expert (I’m not) will be immediately familiar with, then you might try to contact Dr. Van Steenbergen directly; but if it’s not his own code, then you’d do well to explain it very thoroughly (because understanding someone else’s code is really hard!).

To view this discussion on the web visit https://groups.google.com/d/msgid/e-prime/CANw1UKG8%3DAdyOZ9BdRkgBJCU47n2x-o6gE_EtpDq9%2Bf6qHX5dA%40mail.gmail.com.

[Cognitology]

Hi,

I was feeling a bit sorry now, so I took a look anyway. What can I say? Well this: I’m sorry to say this, but this experiment is really ugly and indeed a real mess. There’s hardly a structure – it’s fully linear (I guess this is fMRI style) – and the objects are rarely named. I think you’ll find it much easier to go through the easy steps described in the book.

That said:

·         Getting more trials: by just adding more ImageDisplays and Inlines before the rest. There’s no list for it.

·         There are many throw lists, but they are unreferenced. Look at throw1b: it throws from 1 to 2 (always, because why randomize?). After that, ImageDisplay08, which is the player holding the ball. Look at Inline08:

 

If ImageDisplay08.RESP = "1" Then

      throw2.Run c

ElseIf ImageDisplay08.RESP = "2" Then

      throw3.Run c

ElseIf ImageDisplay08.RESP = "" Then

      throw3.Run c

End If

 

So, if player response 1, throw2 is run, if player responds 2 (or otherwise), throw3 is run. Look in the unreferenced objects (there are hundreds, some used by the experiment, some just for l0lz). I found throw3, there’s List3 inside. List3 runs, in sequence 2to3 and then 3to1. Done with the list, now ImageDisplay09. And so on.

 

There are also many wonky errors, like fixations not in the middle (except sometimes), and it is also really quite ugly. I think you’ll really be better off using The Eprimer’s style.

 

Also, one word of caution. Of course people come here to learn and perfection is obviously not going to happen. However, this is the internet, which is a global thing: if you send your experiment over the internet, do make sure it looks good and feels otherwise a bit professional. Looks good for your lab and personal skills!

To view this discussion on the web visit https://groups.google.com/d/msgid/e-prime/007401d00973%24b6cbc140%24246343c0%24%40eu.

[alex iyer]

Hi Michiel,
   
     I am responding to your very kind involvement in our task (I am working with Ananth).  We are currently using your E-Primer to reprogram the Cyberball task using the instructions you have provided.  however, we seem to be running into another error-namely, that there is a lack of "call to the video" (see a more recent post for details on this).   We have attached the file in that post, and are trying to figure out the source of the error, but to no avail yet.  If you have the time, would you mind taking a look at our program and letting us know how it differs from yours? 

Thank you so much!
Most sincerely,
Alex