[Eeglablist] rectify eeg signal

[Hugh Nolan]

Be careful if you are rectifying your signal, your frequency domain
analysis will not necessarily be correct - a rectified sine wave looks
approximately like a sine wave with double the frequency and half the
amplitude.

-- 
Hugh Nolan,
Trinity Centre for Bioengineering
Trinity Biomedical Sciences Institute,
Trinity College Dublin,
152-160 Pearse Street,
Dublin 2

Tel: +353861297722
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