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Hi Ignacio,
If the activations are from the one run, you can define appropriate contrasts (e.g. 1 -1) to assess differential activation.
If you want to combine multiple scans, you probably want to run a second ('higher') level model with all the scans included as inputs.  Then you can assess mean effects or differences between responses in different scans by defining an appropriate model and contrasts.  Have a look at the section on higher level modelling on the website for an overview of higher level modelling.
Cheers,
Eugene

2009/10/30 Ignacio Letelier <[log in to unmask]>
Hi
 
I would like to know how can I add and/or   subtract different activations of the same subject, and see them in a high resolution T1 3D image. 
 
Thanks
 
Best regards.

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Ignacio Letelier Aguirre.
Estudiante Ingeniería Civil Biomédica
Universidad de Valparaíso, Viña del Mar.
Teléfono: 97139955




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Eugene Duff

Centre for Functional MRI of the Brain (FMRIB)
University of Oxford
John Radcliffe Hospital, Headington OX3 9DU  Oxford  UK

Ph: +44 (0) 1865 222 523  Fax: +44 (0) 1865 222 717

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