Dear spm:
After thinking about the problem of Degrees of Freedom related to spectral
density I now realize the enormous complexity of this issue, and understand
there is probably no direct answer to this question for unsmoothed fmri
data sampled at a relatively low rate (every 2.76 seconds).
So if anyone does understand this and has a model of the autocorrelation
structure, please let me know, otherwise nevermind.
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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