[Eeglablist] eegplot() GUI scale

[Bethel Osuagwu]

Dear Makoto,
Thanks for your response. The data does not have DC offset as everything
below 1 Hz was completely removed. eegplot seem to snap the scale with
respect to the channel with the highest amplitude,; the channels with small
amplitude appears flat. The issue is that whenever I input an arbitrary
scale value, it snaps back to its own auto scale value.

I am happy to share my data with this issue, but if I am the only one
having the issue perhaps I can just carry on viewing data directly on
matlab for now.

Thanks
Bethel


On Fri, Jul 13, 2018 at 7:55 PM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>
wrote:

> Dear Bethel,
>
> Sorry for the trouble.
>
> > When I open the recording the eegplot just snap to certain
> scale which do not necessary allow me to correctly visualise the data
> amplitude. Using the  +- buttons to change the scale does not have any
> effect.
>
> My initial guess is that the data have huge DC drift.
> Try this: in eegplot() GUI, in the top tab, [Display] -> [Remove DC
> offset].
>
> > This could be because the amplitude in some channels are very high
> compared with others.
>
> Even if amplitude is high, as long as they are AC they should frequently
> cross the zero line, hence I guessed DC offset is present. If you recorded
> the data without using high-pass filter... DC drift could be up to 10,000
> uV. High-pass filter removes it as well. Try these solutions and let me
> know if it works.
>
> Makoto
>
> On Thu, Jul 12, 2018 at 10:32 AM Bethel Osuagwu <bethel.osuagwu at gmail.com>
> wrote:
>
>> Dear All,
>> I posted this some time ago and had no response; I am posting again
>> because I think this could be a bug.
>>
>> I am using EEGLAB(v13.5.4b) to process data and am struggling to scale
>> trace
>> amplitudes. When I open the recording the eegplot just snap to certain
>> scale which do not necessary allow me to correctly visualise the data
>> amplitude. Using the  +- buttons to change the scale does not have any
>> effect. Also using the input field to change the scale does not work as
>> the
>> input field only snap to certain values. This could be because the
>> amplitude in some channels are very high compared with others. I keep
>> having to plot the data using matlab plot in other to visualise it.
>>
>> How can I change the scale to any arbitrary value so to see the trace
>> amplitudes nicely?
>>
>> Thanks
>>
>>
>> --
>> *Bethel A. C. Osuagwu*
>> Clinical Research Fellow
>>
>> *Stoke Mandeville Spinal Research*
>> National Spinal Injuries Centre
>> Mandeville Road
>> Aylesbury
>> Bucks
>> HP21 8AL
>> Tel: 01296 31 5963 (Applied NeuroLab)
>> *lifeafterparalysis.com <http://lifeafterparalysis.com/>*
>> ​@lifeafterpara​
>>
>> *justgiving.com/smsr <http://justgiving.com/smsr>*
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>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>



-- 
*Bethel A. C. Osuagwu*
Clinical Research Fellow

*Stoke Mandeville Spinal Research*
National Spinal Injuries Centre
Mandeville Road
Aylesbury
Bucks
HP21 8AL
Tel: 01296 31 5963 (Applied NeuroLab)
*lifeafterparalysis.com <http://lifeafterparalysis.com/>*
​@lifeafterpara​

*justgiving.com/smsr <http://justgiving.com/smsr>*
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