[VoxBo] g design questions

[Charan Ranganath]

Hi, I've realized that the g-design widget has evolved quickly and that 
there are now a number of parameters now available that I don't fully 
understand. Consequently, I've been going consistently with the default 
settings, but I want to see what they mean and when to use each setting.

I'll start with 3 questions:
(1) When adding a diagonal set, you have a choice between "do not scale" 
and "scale by trial count". Do not scale is checked by default. When 
would you want to scale an element of a diagonal set by a trial count, 
and how exactly does it work?

(2) The next choices when adding a diagonal set are "leave offset" or 
"center and normalize," the latter of which is set by default. What does 
this mean, and what are the implications of using one or the other?

(3) At the bottom right of the g-design widget window, there is another 
check box that says, "mean center all but intercept before saving". I 
believe this is checked by default. What are the implications of doing 
this, and when would you NOT want to do it.

Finally, just to verify backward compatibility, do the default settings 
correspond to what was set by default in earlier versions of VoxBo?

Thanks in advance for your wisdom, CR

-- 
Charan Ranganath, Ph.D.
Center for Neuroscience and Dept. of Psychology
University of California at Davis
1544 Newton Ct.
Davis, CA 95616

phone: 530-757-8750
fax: 530-757-8640

http://DynamicMemoryLab.org