Hi - are you referring to how long the first-level analysis takes? If
you include a contrast, but turn the button off (see the bubble-help
on the button for explanation) then the only difference in timing is
that it doesn't get included in the web page (i.e. none).
However, including extra contrasts makes very little difference to
the timing of the first-level analysis, in general.
Cheers.
On 6 Apr 2007, at 18:09, Tim Salomons wrote:
> Quick question: generally how time intensive are individual
> contrasts in a
> first level analysis? At present i have 27 contrasts set up, but
> can cut it
> down to 10 if it will significantly decrease processing time.
>
> If I wish to cut these out, can I simply de-select them? I'm a little
> unsure whether de-selecting simply omits them from the report or
> prevents
> them from being calculated in the first place.
>
> Thanks,
> Tim
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Stephen M. Smith, Professor of Biomedical Engineering
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FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK
+44 (0) 1865 222726 (fax 222717)
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