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investigate the effect of spatial whitening for power and coherence computation #2

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@schoffelen

in the discussion of the effect of subspace projections/regularization/prewhitening I realised that the current dataset has empty room recordings, which may serve perfectly well as 'noise' estimates.

I want to implement optional prewhitening in the existing scripts/functions. This shouldn't be too hard, if things are more or less well organised.

Yet, in working on this, I encountered the not fully finished implementation of vismot_spectral (as compared to vismot_prepost_spectral), where the latter function explicitly handles different numbers of trials (and samples within trials, as a proxy for RT).

I have now built this selection also in vismot_spectral + added the possibility for 'toi' to be 'prepost'.

Also, there is an option prewhiten in place, which uses the emptyroom data (which I have processed using vismot_emptyroom_script)

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