[VoxBo] Orthogonal contrasts including conditions labeled as zero

[Lila Chrysikou]

Hello,

I was wondering how VoxBo treats any condition coded as zero (0) in one's
condition function if that condition is entered in a contrast.

For example, if I have three conditions A, B, and C and the null coded as 0
in the condition function and I want to compare (A+B+C) with the null,
should I enter in my contrast.txt file the contrast coefficients as 1 1 1
and assume that VoxBo will code the null as -3 to set up an orthogonal
contrast?

Or does VoxBo code the null as -1, hence I should enter my contrast as .33
.33 .33 ?

Many thanks in advance for your help-

~Lila

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Evangelia G. Chrysikou, Ph.D.
Post Doctoral Research Fellow
Thompson-Schill Lab

Office address: 3810 Walnut St.,Room 307, Philadelphia, PA 19104
215. 573.6726  (phone)
215. 898.1982  (fax)
E-mail: evangelg at psych.upenn.edu
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