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[open] odd ball task problems: target occurs 2 and 3 x in a row with Sebastians visual ERP example

edited April 2013 in OpenSesame

This very well could be some error I am doing on my end but the experiment stops after 150 presentations of the non targets and targets. Also there are presentations of the target two or three times in a row. There is one easy fix I know I need to do in the script: I need to change the screen size to the correct size. Below is the bug error report:

Python 2.7.3
Type "help()", "copyright()", "credits()" or "license()" for more information.
Type "modules()" for details about installed modules and version information.
Use the "print [msg]" statement in inline_script items to print to this debug window.

openexp._canvas.psycho.init_display(): window type = pyglet
openexp._canvas.psycho.init_display(): waitblanking = True
openexp._canvas.psycho.init_display(): monitor = testMonitor
openexp.sampler._legacy.init_sound(): sampling freq = 48000, buffer size = 512
openexp.sampler._legacy.init_sound(): mixer already initialized, closing
experiment.init_log(): using 'C:/Users/spoernera/Desktop/expiment/subject-3.csv' as logfile (utf-8)
experiment.run(): experiment started at Tue Apr 09 08:37:55 2013
Traceback (most recent call last):
File "dist\libopensesame\inline_script.py", line 111, in prepare
File "", line 6, in
IndexError: pop from empty list
6.5839 WARNING Use of rgb arguments to stimuli are deprecated. Please use color and colorSpace args instead

6.5842 WARNING User requested fullscreen with size [1024 768], but screen is actually [1366, 768]. Using actual size

I have also enclosed the Excel worksheet

trial_type
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
target
non_target
non_target
non_target
target
target
target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
target
target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
target
non_target
non_target
target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
target
target
non_target
target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
target
non_target
non_target
target
non_target
non_target
non_target
target
non_target
non_target
non_target
non_target
target
non_target
target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
target
target
non_target
non_target
target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target
non_target

I was wondering if I could just place the variables in a excel spreadsheet seperating the target/non target to ensure that the target is never seen twice in a row? Would it then be possible for me to place the spreadsheet in opensessame? I am not concerned with a random order as my goal is to establish baseline measures of auditory ERPS.

I was also wondering what changes I would need to to make if I was going to have five trials of 200 presentations with each trial having 20 targets?

Would I most likely get the same results if I continued with one trial, 1000 presentations and 200 targets at 750ms?

I realize you very busy but any suggestions would be very helpful.

Kind Regards,

AJ

Comments

  • edited 2:42PM

    Sorry, I was able to get the experiment to work with the target never being presented twice in a row after putting in the correct screen size.

    Next task is to see if I can get the experiment and Emotiv EEG to communicate. I am going to use Advanced Visual Com Port and the examples in the forum to hopefully achieve this connection.

    would it require a huge modification to change this present experiment to a go no-go task? Hit the space bar every time a person sees the red square and not to hit the space bar when a the blue circle is presented? There would not need to be a change in current frequency of the presentations of targets vs nontargets. I would think I would just need to place the use of the keyboard in the correct place in the script.

    Thanks

    AJ

  • edited April 2013

    Hi AJ,

    Would it require a huge modification to change this present experiment to a go no-go task?

    Perhaps previous forum posts on this topic would get you started. See, for example:

    Please let us know if it's not completely clear how to implement this in your situation.

    Best,

    Lotje

    Did you like my answer? Feel free to Buy Me A Coffee :)

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