The following paper has just been accepted for publication in the journal
Human Brain Mapping, and may be of interest to some:
Smith, S., Beckmann, C., Ramnani, N., Woolrich, M., Bannister, P.,
Jenkinson, M., Matthews, P., and McGonigle, D.
Variability in FMRI: A re-examination of intersession differences.
Human Brain Mapping. In press 2004.
Abstract: We revisit the McGonigle et al (2000) paper on intersession
variability, showing that, contrary to one popular interpretation of the
original paper, intersession variability is not necessarily high. We also
highlight how evaluating variability on the basis of thresholded
single-session images alone can be misleading. Finally, we show that the
use of different first-level pre-processing, time-series statistics and
registration analysis methodologies can give significantly different
intersession analysis results.
A related technical report can be found at
http://www.fmrib.ox.ac.uk/analysis/techrep/#TR04SS1
Regards, Steve.
Stephen M. Smith DPhil
Associate Director, FMRIB and Analysis Research Coordinator
Oxford University Centre for Functional MRI of the Brain
John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
[log in to unmask] http://www.fmrib.ox.ac.uk/~steve
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