list attribute to define the timing of an image display

[Michiel Spape]

Hi Daniel,
So, if I understand you correctly, you have something like:
BlockList (with attribute IpCg1Dur, for instance)
-Which runs some procedure, BlockProc
--Which has TrialList, in which attribute Target1Dur is actually a reference to higher order IpCg1Dur.
Something like that? This should actually work - the error you get suggests the TrialList can't 'find' attribute IpCg1Dur, which is either because of it is not within BlockList, or there's some other error going on. I do find E-Prime sometimes making a bit of a mess of attributes at the 'block' level and those at the 'trial' level (which you can easily see for yourself if you look at the generated .edat (use e-recovery on the .txt output should you not have one) - there'll be independent block / trial / subtrial columns) - with me, this often leads to some confusion.
A suggestion, is to use one or more nested lists instead of referencing deeper and sometimes non-referable levels.

Best,
Michiel

Michiel Spapé
Research Fellow
Perception & Action group
University of Nottingham
School of Psychology
www.cognitology.eu


-----Original Message-----
From: e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] On Behalf Of Daniel
Sent: 03 February 2011 04:48
To: E-Prime
Subject: list attribute to define the timing of an image display

Hi,

What I am trying to do is to use a list attribute to define the timing
of an image display. This works perfectly fine if I use something like
1200 (to define a timing of 1200ms). But if I use an integer variable
(ie. [IpCg1Dur] ) that is defined as 1200ms I get an error that says,
"Factor Error: Can't resolve [IpCg1Dur] in this context." Is there a
way to have an integer placeholder name in brackets as an attribute to
inform an imagedisplay of the correct timing? The reason I want to do
this is I am looking for a more efficient way to run a stop-switch
task. This allows me to have only one procedure record all go and
switch conditions instead of having separate procedures for each
condition.

http://i1139.photobucket.com/albums/n551/Danielw47181/E-primelistattributes.jpg

That is a picture of what I am talking about. Sorry I could not figure
out how to get the picture larger. If you go 9 columns across you will
see the integers in [blue]. [Target1dur] is referenced in Target1 and
[Target2dur] is referenced in Target2 to define the timing.

Hope this makes sense

Thanks

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