Hi. The input to second-level analysis (i.e., the "data") is the
first-level copes. These, when multiplied by 100 * the height of the
first-level regressors and divided by the first-level intensity baseline,
tell you the % change at first level. So, taking that into account, the
second-level fitted data ("y-axis") is interpretable I hope!
On Wed, 15 Dec 2004, Paul Geha wrote:
> Hello everybody,
> Can somebody please explain to me in brief the Y axis values we get in higher level analysis in
> feat. What do they correspond to exactly? what does the zero correspond to
> thanks a lot,
> Paul Geha M.D.
> Northwestern University
> The Feinberg School of Medicine
> Department of Physiology M211
> 303 E. Chicago Ave.
> Chicago, IL 60611
> Tel:312-218 1941
> Fax: 312-503-5101
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