Filtering out Stroop Task trials based on sequence relation to other trials.

[Michiel Spape]

" you can certainly open data files from previous versions of E-Prime without any problem."

...Presumably because E-DataAid hasn't been changed in a decade or so!

	Anyway, what I typically do is copy the relevant variables (I mean, columns) to Excel, do some filtering there (if catA follows catB is pretty easy to do then). Then, go back to E-DataAid, add another variable (not everyone knows it is possible, but just use 'string', use the lowest level possible, and have filtering off before any of this happens) and copy your excel cells back to E-DataAid. 
	From your experiment's point of view, just add a global ('user script' - dim MyGlobalVariable as string) variable, and do something like this
	c.SetAttrib "PreviousCategory", MyGlobalVariable
	MyGlobalVariable = c.GetAttrib ("Category")	'assuming the category is stored in an attribute called Category.
Done: now a new attribute will be available afterwards which contains the previous cat, from which the sequence relationship is easily computed.
Hope that helps!
 
By the way, I prefer designs in which the sequence relationship is randomised in a balanced manner, you might want to give that a try by just presenting two Stroop displays within a single trial procedure.

Michiel Spapé
Research Fellow
Perception & Action group
University of Nottingham
School of Psychology


-----Original Message-----
From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of CallMeTylee
Sent: 28 October 2009 17:05
To: E-Prime
Subject: Re: Filtering out Stroop Task trials based on sequence relation to other trials.


This was the response I received from E-Prime's support site:
-----------------------------------------------------------------------------
Daniel,

If you would like to filter out the trials that follow a Category A
word, or those after a Category A or Category B presentation, you will
need to filter these trials out manually in E-DataAid, as it is not
possible to use the Filter tools in E-DataAid to do this. At this
time, there are no plans to incorporate this kind of feature into E-
DataAid. However, your feedback is greatly appreciated and I will pass
it on to our developers for consideration in future versions of E-
Prime.

Note that the most recent version of E-Prime 1.x is 1.2.1.847. This
build includes E-DataAid v1.2.1.67. While this version of E-DataAid
cannot automatically filter the data based on your criteria, you can
certainly open data files from previous versions of E-Prime without
any problem.

I hope this helps. Please let me know if you have any further
questions. I will be happy to help.

Sincerely,
Cindy Carper
Technical Consultant
--------------------------------------------------------------------------------------------

(This would take a very long time, since presentation sequence changes
for each Stroop Task session.)
        -.-
-Dan


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