How to manage List Objects with changing Sizes, and how to make No Response be the Correct Response?

[David McFarlane]

Wayne,

So you want to manage List levels in script, eh?  Tricky stuff.  As you 
noticed, there is no List.DeleteLevel method, so once you add a level to 
a List you have it forever.  (BTW, the mere absence of a method from the 
online E-Basic Help does not mean it does not exist; e.g., the Help also 
does not mention the List.AddAttrib method, which does exist as I 
documented at http://support.pstnet.com/forum/Topic1241-12-1.aspx .)  So 
you are left with either  (1) deleting the entire List object and 
recreating it from scratch in script, or  (2) using List.SetWeight to 
set the weight of "deleted" rows to 0.  In any case, you must run a 
List.Reset before using your modified list, see the FactorSpace.Reset 
topic in the online E-Basic Help (i.e., the aforementioned .chm document).

As for making no response the correct response, many have asked before 
and if you run a search on the E-Prime List archive or the PST Forum you 
may find this already addressed with several good strategies.  That 
said, as you will again note from the online E-Basic Help, the constant 
EbNoResponseAsCorrect is defined specifically for use with Feedback 
objects (though I don't see any information on how to use it), so it 
likely does not apply to your situation.  It seems to me rather that if 
you just put Allowable = XO on all trials, Correct = X on X trials, and 
Correct = "" (i.e., leave it blank) on O trials, then everything will 
work as you wish.  Please write back and let us know how that works.

Best regards,
-- David McFarlane, Professional Faultfinder


On Fri, Oct 2, 2009 at 3:35 PM, UOMotorControl wrote:
> Hey E-Basic Senseis,
> 
>   Long time listener, first time poster.  At the moment, I'm working
> on a paradigm in E-Prime 1.2 that has a couple of quirks that are
> escaping my ability to figure out using the .chm documents.
> 
> The first - The paradigm consists of two types of trials, each
> repeated 12 times.  Each one of these trials has a random number of
> stimuli (between 10 and 12).  I had been trying to use inline code to
> generate all the randomness of each of the stimuli, and then add then
> to the List object for a given trial type.  What is escaping me is how
> to delete those list levels I just used in order to prevent them from
> interfering with future trials.
> 
> The second -  Each one of these trials essentially involves a subject
> clicking every time they see a 'O', and then not responding when they
> see a 'X'.  As such, the correct response to the 'X' is no response.
> I tried used the property 'EbNoResponseAsCorrect' as the correct
> response in this case, but in testing, not responding was still given
> as an incorrect response.  Any clues as how to best accomplish this?
> 
> Many thanks for your assistance,
> 
> Wayne Manselle
> Motor Control and Cognition Laboratory
> University of Oregon


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