Dear Rachel,
It might help to show screenshots of the results tables for whole brain
and small volume search spaces. Are you referring to peak or cluster
level inference? How did you define your small volume: is it a sphere or
a mask image?
Best regards,
Guillaume.
On 10/11/16 11:17, Mitchell, Rachel wrote:
> Dear SPM community,
>
>
> I have been using small volume correction on a dataset, but curiously,
> when the SVC is applied the p values for regions within the area
> it covers actually become less significant rather than more significant.
>
> This puzzles me given that the corrections are smaller than if using a
> whole brain search volume.
>
> Could anybody explain why this might have happened?
>
>
> with my very best wishes
> Rachel
> ***********
>
> <http://www.kcl.ac.uk/prospectus/graduate/affective-disorders>
>
>
> Dr. Rachel Mitchell.
> Lecturer in Affective Neuroscience,
> Programme Lead, MSc Affective Disorders
>
> Room E2.07
>
> Centre for Affective Disorders (PO box 72),
>
> Department of Psychological Medicine,
> Institute of Psychiatry,
> King's College , London.
>
> 16 De Crespigny Park,
>
> Denmark Hill,
> SE5 8AF.
>
> Email: [log in to unmask]
--
Guillaume Flandin, PhD
Wellcome Trust Centre for Neuroimaging
University College London
12 Queen Square
London WC1N 3BG
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