[Eeglablist] Observation of only high spectral power in lower frerquencies

[Makoto Miyakoshi]

Dear Sandeep,

Well it's a nature of EEG signal. It follows 1/f pattern. If a signal does
not follow 1/f, it is likely to be noise.

Makoto

On Wed, May 13, 2015 at 9:16 PM, sandeep b <b.sandeep29 at gmail.com> wrote:

> Hi,
>
> I'm working on matlab to study different classification algorithms for SMR
> (sensorimotor). I record about 13 to 16  seconds of data (over 60 trials
> - 30 left and 30 right, 10 different people), and deleted background (by
> subtracting mean of each channel). Then I applied a simple FFT, but when
> i plot it i see that there is high spectral power in low frequencies (0 up
> to 4 - 5 HZ). Why there is this high spectral power in lower frequencies.?
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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