Dear colleagues;
I never heard back about these questions but the answers still elude me so
I reasking.
What is the initial threshold for each of the contrasts in the conjunction?
- I assume this is what the user chooses as the height and spatial
extent thresholds?
How close (in terms of significance) do the activations in each contrast
(as part of a conjunction) have to be for a particular voxel to show up in
a conjunction? My understand is that conjunctions show 1) voxels that are
significant based on the chosen thresholds in each contrast and 2) those
voxels whose significance doesn't differ much from one another.
For example, if a voxel had a z score of 3.5 in one contrast and 4.8 in
another, would that show up in a conjunction whose initial threshold were
(height- 3, and extent- 3 voxels)? What about 3.5 and 6?
Thanks,
Darren.
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Darren R. Gitelman, M.D. E-mail: [log in to unmask]
Cognitive Neurology and Voice: (312) 908-9023
the Alzheimer's Disease Center Fax: (312) 908-8789
http://www.brain.nwu.edu
Northwestern Univ., 320 E. Superior St., Searle 11-470, Chicago, IL 60611
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