Dynamic generation of procedures and blocks based on responses

[wdwss]

Hi 
 
I want to execute an experiment consisting of a series of sorting tasks 
with 90 faces in the E-Prime. In the experiment, the participants will be 
asked to indicate if a face is threatening or nonthreatening by pressing 
either one of the two button boxes as quickly as they can, during which RTs 
will be recorded.  After the first procedure of sorting that includes all 
90 faces, some faces (say, N= x)  will be "threatening" and the rest (N= 
90-x) will be "nonthreatening". Then, within the x "threatening" faces, 
another procedure of sorting based on "slightly threatening" and "very 
threatening"will be administrated automatically. Then, additional 
procedures of sorting based on more or less "threatening" ratings of the 
faces will be dynamically and automatically generated to specify 
the threatening levels of the faces. These series of procedures continue 
until there is only one face left in the "more threatening" group as you 
can imagine. Since experimenters don't know which faces will be judged 
"threatening", "very threatening" or whatever labels we name them, the 
length (or depth in terms of loops) of the whole experiment  is unknown 
prior to designing the E-Prime program. 
 
My question is if E-Prime and E-Basic have the capacity to enable dynamic 
generation of new procedures, blocks and assigning stimuli to them  
automatically based on the choice of participants? How to accomplish 
that? I learned that the task I intend to accomplish looks very similar to 
the Contingant Branching, but it still has its unique problem with the 
uncertainty in the number and content of "Branching". 
 
Looking forward to your precious comments, suggestions and critics! 
 
Thanks a lot!
 
Best,
 
Shensheng 

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