Hi,
I think this can be caused by the Gaussian smoothing which moves signals from
cortex to outer regions with no signal.
you may try to reduce the gaussian kernel size and to see how this is afecting
the location of your activations.
hope this helps
Jose Manjon
Mensaje citado por neeru K <[log in to unmask]>:
> Dear SPMers!
> I am doing fMRI of anesthetized monkeys and I am getting BOLD acitvations
> (analyzed in SPM5) outside the brain (in addition to inside the brain),
> especially in the muscles overlying the skull and orbits of eyes and it
> seems consistent.
> I thought it could be a problem with coregistration but it persistes even
> when I overlay the contrasts onto the mean EPI image....
> Has anybody faced a similar problem in human data and if so what is the
> solution...
> Could there be also a problem in acquisition of the data
>
> Thanks
>
> --
> Niranjan Kambi
> SRF, Neeraj Lab,
> National Brain Research Centre
> Manesar, Gurgaon-122050
> Haryana, INDIA
> Ph:+919818654846
>
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