[Eeglablist] What is the unit of datas in EEG.data

[Stephen Politzer-Ahles]

I think there is one exception, which is that the loadavg() function for
Neuroscan .avg data does some kind of scaling (see see
http://sccn.ucsd.edu/pipermail/eeglablist/2011/003986.html and some other
messages on the list) so the data aren't in microvolts or (I think) a
straightforward multiple of microvolts. I'm not sure if that's your data
format, but if it is then that message includes a different function you
can use to get the data in microvolts.

Best,
Steve



Stephen Politzer-Ahles
New York University, Abu Dhabi
Neuroscience of Language Lab
http://www.nyu.edu/projects/politzer-ahles/


On Fri, Apr 25, 2014 at 7:19 AM, Makoto Miyakoshi <mmiyakoshi at ucsd.edu>wrote:

> Dear Fanny,
>
> That's an interesting question. I guess the unit is fixed to be microvolt,
> and it's not written anywhere!
>
> Makoto
>
>
> 2014-04-24 0:57 GMT-07:00 GROSSELIN, Fanny <fanny.grosselin at edu.esiee.fr>:
>
>> Hi Makoto,
>>
>> Thank you for your response. However, I wonder if unit is saved somewhere
>> in the workspace of Matlab or if I have to get back it in the header file?
>>
>> Fanny
>>
>>
>> 2014-04-23 22:40 GMT+02:00 Makoto Miyakoshi <mmiyakoshi at ucsd.edu>:
>>
>> Dear Fanny,
>>>
>>> I know some of import function can specify the units for amplitudes. If
>>> you have problem, you can try
>>> EEG.data = EEG.data*/1000;
>>> to convert microvolt to millivolt.
>>>
>>> Makoto
>>>
>>>
>>> 2014-04-23 8:13 GMT-07:00 GROSSELIN, Fanny <fanny.grosselin at edu.esiee.fr
>>> >:
>>>
>>>> Hi everybody,
>>>>
>>>> I would like to know what the unit of data is in EEG.data?
>>>> Is there microvolts unit for any type of file loaded, even if data are
>>>> in millivolts in the initial file?
>>>>
>>>> Thank you in advance for your help,
>>>>
>>>> Fanny
>>>>
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>>>
>>>
>>>
>>> --
>>> Makoto Miyakoshi
>>> Swartz Center for Computational Neuroscience
>>> Institute for Neural Computation, University of California San Diego
>>>
>>
>>
>
>
> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
>
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