Hi,

It is important to understand that each different contrast fundamentally asks a different question, so you would not expect to see the same results. The contrasts should be set based on the hypotheses that you want to test in your study, and not based on looking at the results!

Best wishes,

Janine

On 19 Oct 2018, at 08:40, Carlotta Fabris <[log in to unmask]> wrote:

I tried three different contrasts: [1 -1 1 -1] [1 1 -1 -1] [ 1 -1 -1 1] for all the 6 runs for subject 1 and 2 just to see if I could exclude one of these, but I got very different results and I can't decide which to take out and which not.

Is it normal? Should I do every first level analysis including the three contrasts?

Thank you,
Carlotta.

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Dr Janine Bijsterbosch
Postdoctoral Researcher
FMRIB Centre, University of Oxford
John Radcliffe Hospital
Oxford, United Kingdom
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