[Eeglablist] Does EEGLAB work with EMOTIV systems

Tue Jun 19 21:25:23 PDT 2012

On Wed, Jun 20, 2012 at 1:51 PM, nabaraj dahal <nabarajdahal at gmail.com>wrote:

> Dear Tom,
> I am also using emotiv system in my study.
> I was not able to import the EDF files in EEGlab with version 10 and
> version 11 with the following warning.
> WARNING SOPEN(EDF): Physical Max/Min values of EDF data are not
> necessarily defining the dynamic range.
>    Hence, OVERFLOWDETECTION might not work correctly.
>
> However, with the EEGLAB v9.0.8.6b, the import was succesful with the same
> warning and also a corrective not as:
> eeg_checkset note: upper time limit (xmax) adjusted so (xmax-xmin)*srate+1
> = number of frames
>
> I am worried whether such corrective action would twist my data.  I am
> importing a 2 minutes EEG data recorded from Emotiv in EDF format.
> Is there anything else I can do to make the data within the range?
>
>
> Best Regards,
> Nabaraj Dahal
> University of South Australia.
>
>
> On Wed, Jun 20, 2012 at 8:57 AM, Tom Campbell <tom_campbell75 at hotmail.com>wrote:
>
>>  Hi Philipp,
>> The Emotiv spec promises 16-bit format (an effective 14-bit precision)
>> when 12-bit precision used to be regarded as good enough, when .edf was
>> drawn up as 16-bit. With a dynamic range of 256mv pp that leaves what I
>> think is a quantization error of +/- (256/(2^14))*1000 = +/-15.625 uV
>> pp. This may nor be a big deal and could be the least of the noise.
>> Is there other noise (amplification, artifactal loss of contact of saline
>> electrodes) that comes from somewhere upstream of digitization? Or is some
>> further precision lost somehow when writing to .edf in the software that
>> may be otherwise used in RAM and is potentially recordable?
>>
>> Best regards,
>> Tom.
>>
>>
>>
>>
>> ------------------------------
>> Date: Tue, 19 Jun 2012 10:40:48 +0200
>> From: leppert at eye-square.de
>> To: smakeig at ucsd.edu
>> CC: eeglablist at sccn.ucsd.edu; smakeig at gmail.com
>> Subject: Re: [Eeglablist] Does EEGLAB work with EMOTIV systems
>>
>>
>> Hi Josh,
>>
>> we imported the Emotive RawData into EEGlab before but the noise-ratio
>> was not too convincing.
>> I guess you are not interested in the post import of the raw-data?
>>
>> best regards
>> Philipp
>>
>>
>> Am 19.06.2012 00:23, schrieb Scott Makeig:
>>
>> Josh -
>>
>> Re the Emotive head set: So far as I know, this is the first
>> multi-channel (14 chan) wireless EEG system to be introduced at a
>> (relatively) low price point.
>>
>> A group in Denmark have told us they plan to soon release open source
>> software for dealing with this headset and for linking it to mobile phones
>> -  I hope they may also include or make simple a function to import the
>> data into EEGLAB.
>>
>> Once their software is available, likely someone at SCCN may integrate an
>> Emotiv driver into our ERICA real-time interactive software environment,
>> now using LSL (lab streaming layer) software (soon to be documented).
>>
>> Another group in Germany now has a report in press in which they attached
>> the electronics of the Emotiv headset directly to standard electrodes
>> mounted in an electrode cap, with encouraging results.
>>
>> There are other 16-24 channel wireless headsets including dry (chip)
>> electrodes coming onto the market - whether any will be introduced at a low
>> price point I don't know....
>>
>> Scott Makeig
>>
>>
>>
>> On Fri, Jun 15, 2012 at 3:34 PM, findjoshgold at gmail.com <
>> findjoshgold at gmail.com> wrote:
>>
>> Hello,
>>
>> I am looking at purchasing the EMOTIV research system and wondering if
>> anyone knows if EEGLAB can be used with EMOTIV and do they have any
>> resources on how to get the data across.
>>
>>  Many Thanks,
>>
>> Josh Gold
>>
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>>
>> --
>> Scott Makeig, Research Scientist and Director, Swartz Center for
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>> Neurosciences (Adj.), University of California San Diego, La Jolla CA
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