Hello EK,
                 The mean component is the timeseries average ( sum divided by number of elements ). If you wish to apply a highpass filter but retain the mean, you will need to save the timeseries mean before filtering and restore it after filtering.

Kind Regards
Matthew

> To experts,
>
> In FSL v 5.0.7, "the highpass temporal filter in fslmaths now removes the mean component."
> Does anybody know what is "the mean component"?
> I obtained different results v 5.0.6, and v 5.0.7 using highpass filtering (-bptf).
> The mean component should be treated as noise?
> If not, how can I set options like v 5.0.6?
>
> All the best,
>
> EK