Hi
the hp filter is in seconds - if you keep the mouse pointer on the
values field, a balloon help window should pop up explaining in more
detail how to pick a sensible value. If you've got 24 second blocks
(i.e. 24s on, 24 s off) than setting it to e.g. 50s seems reasonable...
cheers
christian
On 21 May 2004, at 15:45, Jennifer Bramen wrote:
> Hi Everyone,
>
> If I am using a blck design, then I should only expect very low
> frequencies to be associated with
> my task. I have a scanning session that is very noisy, and I was
> wondering if there is any reason
> not to lower the filtering threshold from 100 Hz. What is the lowest
> I can reasonably go? I am
> using 24 second bocks, so I imagine I could go as low as 10 Hz and not
> filter out any data.
>
> Thanks in advance.
>
> Jen
>
>
> Jennifer Bramen
> UCLA Brain Mapping Center
> 660 Charles Young Dr. So
> Los Angeles, CA 90095
>
--
Christian F. Beckmann
Oxford University Centre for Functional
Magnetic Resonance Imaging of the Brain,
John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK
Email: [log in to unmask] - http://www.fmrib.ox.ac.uk/~beckmann/
Phone: +44(0)1865 222782 Fax: +44(0)1865 222717
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