Hello, in the documentation for apply_proj() (see link below) it states:
Once the projectors have been applied, they can no longer be removed. It is
usually not recommended to apply the projectors at too early stages, as
they are applied automatically later on (e.g. when computing inverse
solutions). Hint: using the copy method individual projection vectors can
be tested without affecting the original data. With evoked data, consider
the following example:
Does this mean that if I apply the vectors that they will then be reapplied
when I later compute the inverse?
if a proj is applied to data, the same proj will be applied to noise cov
and forward operator when localizing sources. Proj can be applied
multiple times, it has no effect to reapply them a second time.
Even if the signal changes between when I applied the projection and when
it is reapplied?
Let's say I compute some projections and apply them. Then I do a band pass
filter. The signal has changed and so I assume the PCA components of the
signal changes as well. So then when I reapply the projections that were
created before band pass to the band pass data I feel like they will have
an effect. But I'm an signal processing novice.