List counterbalancing by sujbect

[David Vinson]

Hi Rachel,

I approached this problem a different way, not using nested lists.

The MasterList contains 8 lines, each running a different procedure (one 
for each of the 8 subject groups), e.g.
RunProc1
RunProc2
RunProc3
...

(and in its simplest form no other information is specified in the 
MasterList)

Each of these RunProc* procedures just contains a single List (akin to 
your Group1List, Group2List, Group3List...) all of which contain the 
full list of items for that Group, and call the same experimental trial 
procedure.  These are set to exit after all samples in the list (the 
number of items).

The master list is set to Exit after 1 sample, and Offset - because only 
one entry per subject is selected, there's no need to worry about what 
order the master list is sampled in (you control this by your assignment 
of subject number).

this way each subjects sees only one entry in the Master list, and all 
items in their respective Group list.

hope this helps!
-david



On 11/03/2012 22:34, Rachel wrote:
> Hi All,
>
> I have an extremely simple question that I know must be possible to
> do, but I simply cannot get it to work. I've read a jillion old forum
> posts, but it seems like everyone is asking a much more complicated
> question than I have, and so I can't find just a basic template to
> work off of.
>
> I have 8 subject groups, each with its own list of video stimuli. I
> want each subject to see all of the video stimuli from exactly one of
> these lists. I created a master list (GroupList) with 8 nested levels
> (Group1, Group2, ..., Group8) and in the master list, I set Selection
> to Counterbalance by Subject. However, instead of playing every video
> in the appropriate Group# list, it plays exactly 1 video and then
> exits. What is going on? How do I make it play every single trial in
> that one group list, and cycle through and choose a different group
> list for each new subject?
>
> For example, Subject1 should see all 118 videos in the Group1 list (in
> a random order); Subject2 should see all 118 videos in the Group2
> list; Subject3 should see all 118 videos in the Group3 list, and so on
> through all 8 Group# lists.
>
> This is really time-critical, especially since this seems to be
> exactly what the Counterbalance option should do, so as prompt a
> response as possible would be really appreciated.
>
> Thanks,
> Rachel
>

-- 
David Vinson, Ph.D.
Senior Postdoctoral Researcher
Cognitive, Perceptual and Brain Sciences Research Department
University College London
26 Bedford Way, London WC1H 0AP
Tel +44 (0)20 7679 5311  (UCL internal ext. 25311)


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