Subject: | | Post-doctoral position: The neuroanatomical correlates of political attitudes and behaviors |
From: | | Francesca Benuzzi <[log in to unmask]> |
Reply-To: | | [log in to unmask][log in to unmask]] > Sent: Thursday, December 18, 2008 7:49 AM > To: Dana Perantie; [log in to unmask] > Subject: Re: [SPM] forward/backward flow, warp, map > > > Thank you, John. I understand all but your last sentence. The u* can be > > applied to the DARTEL-imported images (Create Warped is applied to > > rc1*.nii), but the transform that was made by combining u* flow fields > > cannot be applied to the imported images? I would have guessed the other > > way around - that they could not be applied to the original-native-space > > images. Are the u* files flow fields between the imported images and the > > resulting template, or original-native-space and the resulting template? > > The deformation fields are generated so that there is a mapping to the > images prior to their being imported, rather than to the imported images. > I figured that this would be generally more useful. It is possible to > achieve because the imported images (and u_*.nii files) contain two > different matrices in their headers. One of them (the one used by Display > and Check Reg) shows the imported images in alignment with each other. The > other one (not used by Display and Check Reg) contains a mapping that > relates the imported to the original image. > > > We made a script (attached) to convert the y* deformation field to > > Jacobian determinant image that can be used to multiply/modulate. This > > was based on snippets of HDW scripts as suggested in previous posts. Our > > next step is to make a script to do it in a batch: calculate the > > compositions y*, translate to Jacobians and modulate (for a list of > > subjects at multiple timepoints). > > That's a good approach. > > Best regards, > -John > > > -----Original Message----- > > From: John Ashburner [mailto:[log in to unmask]] > > Sent: Wednesday, December 17, 2008 1:02 PM > > To: Dana Perantie; [log in to unmask] > > Subject: Re: [SPM] forward/backward flow, warp, map > > > > I usually get confused myself when dealing with compositions of warps, > > and have to refer to the example in Section 1.4 of the Dartel Guide. I > > find this sort of thing is much easier to figure out with by equations > > than with words. > > > > When creating a warped an image, the usual approach is to scan through > > the image to be created. For each voxel (of the new image, which is to > > be created), the resampling needs to figure out where in the original > > image to read the value from. In other words, it needs a mapping from > > coordinates in the new image, to coordinates in the original. > > > > >If I > > > Normalise: Estimate with Image1 as the source and Image2 as the > > > template, then the resulting *sn.mat transforms from Image1 (source) to > > > Image2 (template), and this is called the "map" or "mapping" from > > > Image2 (template) to Image1 (source)? > > > > Yes. The algorithm needs to know where in image 1 to read theDæu |
Date: | | Wed, 14 Jan 2009 16:21:36 +0100 |
Content-Type: | | text/plain |
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A position is available for a full-time, up to two years,
Post-Doctoral Fellow fully funded by the Fondazione Cassa di Risparmio
di Modena (Italy) on the project 'The neuroanatomical correlates of
political attitudes and behaviors' at the Department of Neuroscience,
University of Modena and Reggio Emilia (tutor: Prof. Paolo Nichelli).
Job description:
Our team explores the neuroanatomical correlates of complex social
behaviors, using both fMRI and clinical research on patients with
degenerative disorders. The project is an international collaborative
effort including our team and the research group leaded by Jordan
Grafman (Cognitive Neuroscience Section of the NINDS, NIH, Bethesda,
MD, USA). It is aimed to investigate the brain mechanisms that
underlie politics and to create and standardize tests that measure and
evaluate possible political beliefs' changes in neurodegenerative
diseases. The successful candidate will have access to the research
facilities and available equipment in the laboratory including
behavioral/psychophysical testing and 3T fMRI. He/she will be also
requested to collaborate with the research group at the NIH.
The post-holder will be responsible for (1) the design, conduct,
analysis and writing-up of experiments in conjunction with the
Principal Investigators, (2) disseminating the results at
international conferences and (3) participating to the day-to-day
running and scientific activity of the research group (conferences,
seminars, journal clubs).
Requirements:
We are seeking a post-doctoral scientist who will be mainly involved
in the both fMRI and clinical studies. The candidate will be
experienced in autonomous scientific work. He/she will have a good
background in clinical neuropsychology and a strong motivation to
learn functional imaging techniques or, alternatively, previously
acquired experience in functional imaging techniques and a strong
interest in clinical neuropsychology.
Deadline: for application January 29, 2009.
Contact: Prof. Paolo Nichelli ([log in to unmask])
--
Francesca Benuzzi, PhD
Dip. di Neuroscienze
Università di Modena e Reggio Emilia
Nuovo Ospedale C. Sant'Agostino e Estense
Via Giardini 1355, 41100 Baggiovara Modena (Italy)
phone(w): +39-059-3961679
fax (w): +39-059-3961336
e-mail(w): [log in to unmask]
e-mail(h): [log in to unmask]
http://www.fmri.it
http://cdm.unimo.it/home/dipneu/benuzzi.francesca/
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