hi Mark, Steve:
Many thanks for your reply. I do want to take FSL/fMRI course, but I am afraid that I couldn't get a chance easily. I will try to refer to those books you mentioned
Thanks alot
Xuelin
****************************************
Xuelin Cui
Department of Electrical Engineering
University of Hawaii-Manoa
Honolulu HI 96822
Tel: 1-808-349-0983
Email: [log in to unmask]
****************************************
----- Original Message -----
From: Mark Jenkinson <[log in to unmask]>
Date: Monday, April 2, 2007 10:46 am
Subject: Re: [FSL] AW: [FSL] AW: [FSL] how to relate each IC to different tasks?
To: [log in to unmask]
> Dear Xuelin,
>
> The HRF, or Haemodynamic Response Function, is a fundamental
> concept in FMRI. If you do not know about this I suggest that you
> read some of the basic texts on FMRI such as:
> - Functional MRI: An Introduction to Methods; P Jezzard, PM
> Matthews, SM Smith (Eds); Oxford University Press
> - Introduction to Functional Magnetic Resonance Imaging:
> Principles and Techniques; RB Buxton; Cambridge University Press
> - Functional Magnetic Resonance Imaging; SA Huettel, AW Song, G
>
> McCarthy; Sinauer Associates
>
> These should be more accessible than any particular papers.
>
> All the best,
> Mark
>
>
> On 1 Apr 2007, at 21:41, Xuelin Cui wrote:
>
> > hi Andreas:
> >
> > I read the slides you mentioned, the fMRI intro slides. To be
> > honest to you, although it looks good, but I still dont quite
> get
> > the experiment. Is there a paper detailedly discribe the experiment?
> >
> > Thanks
> >
> > Xuelin
> >
> > ****************************************
> > Xuelin Cui
> > Department of Electrical Engineering
> > University of Hawaii-Manoa
> > Honolulu HI 96822
> >
> > Tel: 1-808-349-0983
> > Email: [log in to unmask]
> > ****************************************
> >
> > ----- Original Message -----
> > From: Andreas Bartsch <[log in to unmask]>
> > Date: Saturday, March 31, 2007 10:13 pm
> > Subject: [FSL] AW: [FSL] AW: [FSL] how to relate each IC to
> > different tasks?
> > To: [log in to unmask]
> >
> >> Hi Xuelin,
> >>
> >> why don't you start with
> >> http://www.fmrib.ox.ac.uk/fslcourse/lectures/intro1/
> >> mri_fmri_intro_slides.pdf , see page 49 in particular. Or join
> one
> >> of the next FSL courses. I know - it is a long trip from Hawaii
>
> >> but it may be worth it.
> >> Lets say you have a boxcar type of experiment (see page 42 of the
> >> pdf), you can model this be a series of "0" and "1" entries. You
> >> can simply take this vector and correlate with the t*.txt from
> >> melodic's output. Alternatively, you may want to convolve your
> >> expected response vector with a hemodynamic response function -
> >> e.g. a synthetic like the double-gamma HRF or even an empirical
> >> one obtained specifically for your type of stimulus / brain region
> >> / experiment.
> >> Hope this helps-
> >> Andreas
> >>
> >> ________________________________
> >>
> >> Von: FSL - FMRIB's Software Library im Auftrag von Xuelin Cui
> >> Gesendet: Sa 31.03.2007 00:07
> >> An: [log in to unmask]
> >> Betreff: Re: [FSL] AW: [FSL] how to relate each IC to different
>
> >> tasks?
> >>
> >>
> >>
> >> hi Andreas:
> >>
> >> Thanks for your reply.
> >>
> >> But I dont totally understand what you said. Could you please
> >> explain a little bit more on that: "However, you can simply
> >> correlate your design (boxcar or, for event-related studies
> >> namely, your stimulus-/response-ons convolved with some type of
> >> HRF)" What is a HRF? Do you have an example, or a relevant paper?
> >>
> >> Thanks
> >>
> >> Xuelin
> >>
> >> ****************************************
> >> Xuelin Cui
> >> Department of Electrical Engineering
> >> University of Hawaii-Manoa
> >> Honolulu HI 96822
> >>
> >> Tel: 1-808-349-0983
> >> Email: [log in to unmask]
> >> ****************************************
> >>
> >> ----- Original Message -----
> >> From: Andreas Bartsch <[log in to unmask]>
> >> Date: Tuesday, March 20, 2007 3:26 pm
> >> Subject: [FSL] AW: [FSL] how to relate each IC to different tasks?
> >> To: [log in to unmask]
> >>
> >>> Hi,
> >>> Strictly speaking: you can't (- at least not by just running a
> >>> single experiment and analysing it;)
> >>> However, you can simply correlate your design (boxcar or, for
> >>> event-related studies namely, your stimulus-/response-ons
> >>> convolved with some type of HRF) with the time-course (in SD
> >>> units) of the respective tXX.txt file. Or even easier, if you have
> >>> no spatial hypothesis whatsoever, select those Ics whose FFT are
> >>> peaking at the appropriate frequency and then look at the time-
> >>> courses, if they are synchronous to your paradigm.
> >>> Hope that helps-
> >>> Andreas
> >>>
> >>> -----Ursprüngliche Nachricht-----
> >>> Von: FSL - FMRIB's Software Library
> [mailto:[log in to unmask]] Im
> >>> Auftrag von Xuelin Cui
> >>> Gesendet: Dienstag, 20. März 2007 00:55
> >>> An: [log in to unmask]
> >>> Betreff: [FSL] how to relate each IC to different tasks?
> >>>
> >>> hi folks:
> >>>
> >>> I here have a question. I am doing the ICA analysis on fMRI data.
> >>> But I am confused on how to relate rach IC extracted from the fMRI
> >>> data to different tasks. Put in this way: if I see an IC, how can
> >>> I tell the IC is caused by what kind of reason?
> >>>
> >>> Anyone could give any suggestions? I really appreciate your
> >> thoughts.>
> >>> Thanks
> >>>
> >>> Xuelin
> >>>
> >>> ****************************************
> >>> Xuelin Cui
> >>> Department of Electrical Engineering
> >>> University of Hawaii-Manoa
> >>> Honolulu HI 96822
> >>>
> >>> Tel: 1-808-349-0983
> >>> Email: [log in to unmask]
> >>> ****************************************
> >>>
> >>
>
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