[Eeglablist] Consequences of manual rejection on continuous data

[Alexis Leiva]

Dear all,

 I am performing an experiment with 4-minute blocks to analyze the power
spectrum from the entire block but not in epochs. Then, when I manually
reject a noisy segment from the continuous data in EEGLAB, a boundary mark
event appears in the channel data.

Now, my question: Is this method of rejection and the boundary mark
apparition in EEGLAB a “cut and splice” implementation, inserting a kind of
imbalance into the signal after splicing the pre- and post-noise segments?
Knowing the possible consequences of manual rejection of my continuous data
is critical because I don’t know if this implementation might cause a
non-evident discontinuity of my data, some distortion, unreliable outcomes,
or another kind of issue on the power spectrum calculus through Welch’s
method on the entire blocks.

I appreciate your help.

Regards,

Alexis

-- 
 Alexis Leiva Catalán
Tecnólogo Médico  mención en ORL Universidad de Chile.
 Candidato a PhD Neurociencias Pontificia Universidad Católica De Chile.