[FieldTrip] Identify nREM sleep

[Sarah Marbella Grace De Leoz]

Greetings,
I am currently trying to practice on preprocessing and feature extraction
on sleep datasets. I have been following FieldTrip's tutorial on this
<https://www.fieldtriptoolbox.org/tutorial/sleep/#extracting-the-brain-state-and-events-from-continuous-sleep-eeg>
and
seem to be encountering some issues in the section on identifying nREM
sleep. After creating a combined channel of the normalized signal of
slow-wave activity (SWA) and spindle, ft_databrowser ends up reflecting
these 5 channels as flat lines instead of what is shown in the tutorial.
May I know how to fix this?

Thank you in advance!

--
*Sarah Marbella Grace O. De Leoz*
*BS Physics *
*University of the Philippines*
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