[Eeglablist] noise at 50, 70, and 80 Hz

Chao Han hanchao at udel.edu
Mon Oct 28 17:28:59 PDT 2019


Thank you, Jason.
We did some testing and we suspect the noise is from the internal wiring of
the EEG booth.

Best,
Chao

On Mon, Oct 28, 2019 at 8:05 AM Jason Palmer <japalmer29 at gmail.com> wrote:

> Hi Chao,
> I doubt this helps much, but you might consider refresh rates if you have
> monitors around.
> Best,
> Jason
>
> On Mon, Oct 28, 2019, 8:57 PM Chao Han <hanchao at udel.edu> wrote:
>
>> Sampling rate = 250 Hz.
>>
>> On Mon, Oct 28, 2019 at 5:58 AM СанитарЖеня <emasherov at yandex.ru> wrote:
>>
>> > sample rate=?
>> >
>> > > Dear all,
>> > >
>> > > I plotted that channel spectra of my unfiltered continuous raw EEG
>> data
>> > and
>> > > found the line noise at 60 Hz. But there are also spikes at 50, 70,
>> and
>> > 80
>> > > Hz. I'm wondering what those noises might be. Thanks!
>> > > Here is a link to the plot:
>> > >
>> >
>> https://docs.google.com/drawings/d/1LtkAMscOYzSH5f-r-0O0mweastJsFqyUZNhzclXb_EQ/edit?usp=sharing
>> > >
>> > > Best,
>> > > Chao
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