Christophe,
That will depend entirely on your hypothesis and expected effect size. The final stage of analysis with MELODIC ICA + dual regression typically involves some sort of GLM (often a t-test) to compare connectivity between two or more experimental groups. The standard techniques for estimating effect size (e.g. Cohen's d) and power apply. Since your experimental protocol will influence the standard error, and thus the effect size, of your data, the best way to figure out how many subjects you need is to collect pilot data and estimate your effect size and power from that. As a very rough ballpark figure, I have seen ICA based publications with fewer than 20 total subjects.
Hope this sets you on the right track,
Benjamin
On Wednesday, August 15, 2012 09:10:07 you wrote:
> Dear experts,
>
> I would like to know the lower population size required to compute MELODIC ICA
> group-analysis.
>
> Thank you.
> Best,
> Christophe
>
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