Hi Juergen,

we're trying to minimize technology-induced differences. In the case where tp1 and tp2 are the same scan, you will then have applied a different procedure to tp2 then tp1 (it will have been processes longitudinally twice), so you will find differences where none exist. This is why we avoid it.

cheers, Bruce On Wed, 12 Nov 2008, Juergen Haenggi wrote:

Dear FS experts

Is there any difference or problem when running tp2 on the "longitudinally adjusted" tp1 instead on the recommended cross-sectionaly processed tp1?

Thanks in advance Regards Juergen

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Juergen Haenggi Ph.D. (Dr. des.) Division of Neuropsychology Institute of Psychology University of Zurich Binzmuehlestrasse 14, PO Box 25 8050 Zurich, Switzerland 0041 44 635 73 97 (phone office) 0041 76 445 86 84 (phone mobile) 0041 44 635 74 09 (fax office) BIN 4.D.04 (office room number) j.haenggi@psychologie.uzh.ch (email) http://www.psychologie.uzh.ch/neuropsy/ (website) http://www.juergenhaenggi.ch (private website)

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