Preproc - thresholding negative z-scores too?

[Alexander Maye]

Dear Jan-Mathijs and All!

Thank you for the quick response. Hilbert indeed flips my eye blinks towards positive 
z-values - at the cost of reduced discriminability. That is to say that the amplitude of the 
z-score of the eye blink is twice as high without Hilbert (but in the "wrong" direction). Apart 
from that I still would like to know the rationale behind considering deviations of the z-value 
towards +Inf as artifacts, while those towards -Inf not. This is the same concern as in 
#Item001386 of this list exactly one year ago. Any opinions?

Best,

                         ALEX.

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