[wineeg] Re: Mitsar question

  • From: "Juri D. Kropotov" <kropotov@xxxxxxxxxx>
  • To: "Vernon, David" <d.vernon@xxxxxxxxxxxxxx>
  • Date: Wed, 9 Jul 2003 19:16:36 +0400

Hi, David,
I asked Valery about this problem.  He has a new version of the
program that manages this problem.  He will send it on the next week.

 The new version will include an option for using LORETA with Win EEG!!!


VD> Hello

VD> i am going through an EEG file that i recorded using the Mitsar and after
VD> completing the automatic EOG correction i wanted to go through the raw trace
VD> myself and cut out any very noisy sections. I Managed to do this using the
VD> mouse and the scissors symbol on the tool bar. When i do this a bold blue
VD> line appears at the bottom of the raw EEG file.

VD> However, when i then run the analysis it gives exactly the same output as a
VD> raw EEG that i have not gone through and removed the additional artefacts.
VD> Thus i must be missing something out. I have checked the manual but can find
VD> no reference to manual artefact rejection using the cut tool. Can you help
VD> me please, what do i have to do to make sure that the sections i have cut
VD> are not included in the analysis?

VD> thanks

VD> david

VD> David J Vernon PhD
VD> Dept. of Cognitive Neuroscience & Behaviour
VD> Imperial College London
VD> St Dunstan's Road
VD> London
VD> W6 8RP

VD> Tel:    44 (0) 208 383 0584
VD> Fax:   44 (0) 208 846 1670

VD> -----Original Message-----
VD> From: Juri D. Kropotov [mailto:kropotov@xxxxxxxxxx]
VD> Sent: 03 July 2003 16:05
VD> To: Vernon, David
VD> Subject: Re[2]: data issues

VD> OK, David.
VD> I'll check it and ask my server to enlarge my mail-box.
VD> Juri

VD>> Hi Juri,

VD>> i cannot send you the data files, as everytime i have tried they just
VD> come
VD>> back undelivered. I checked with out technical people and they say its
VD>> because your mailbox is to small to accept a 3.5mb file. I checked this
VD> out
VD>> by sending the file to Annie and she received it. I tried again to send
VD> one
VD>> to you and again it was returned. Do you know if your mailbox can accept
VD>> files as large as 3.5mb if not the only way i can see of getting you the
VD>> data will be to send it over on a cd, not ideal but i would really value
VD>> your input

VD>> david

VD>> David J Vernon PhD
VD>> Dept. of Cognitive Neuroscience & Behaviour
VD>> Imperial College London
VD>> St Dunstan's Road
VD>> London
VD>> W6 8RP

VD>> Tel:    44 (0) 208 383 0584
VD>> Fax:   44 (0) 208 846 1670

VD>> -----Original Message-----
VD>> From: Juri D. Kropotov [mailto:kropotov@xxxxxxxxxx]
VD>> Sent: 02 July 2003 16:53
VD>> To: Frick, Ann
VD>> Cc: 'Megan Kelley (E-mail)'; Vernon, David
VD>> Subject: Re: data issues

VD>> Dear Annie,
VD>> I've not got any EEG files from David and I am waiting to get it from
VD>> you.

VD>> You mentioned TOVA for ERPs.  Please use the animal GO/NOGO task I
VD>> gave to you. We have 250 children data base for this task.

VD>> As far as September concerns, I am going to Houston at iSNR conference
VD>> and afraid that it will be exactly the third week of September.  Let
VD>> us think about other dates.

VD>> All the best, Juri

FA>>> Dear Juri--I have been trying to send you the following email and
VD> zipped
FA>>> data files.  This hasn't been working.  So here is the original
VD>> email--files
FA>>> to follow as soon as I can figure out how.
FA>>> AF

FA>>> Dear Juri,
FA>>> I believe David sent you two files for a boy, TG, dob 12/10/1990.  I
VD>> think
FA>>> he is clearly in the 10% group that Chabot and Serfontein talk about.
VD>> He
FA>>> does have high frontal beta.  In fact, during recording, I was
VD> wondering
VD>> if
FA>>> it wasn't a very high alpha, but it doesn't attentuate with eyes open.

FA>>> However, all the children we've recorded show a pattern that is
VD>> consistent
FA>>> and puzzling.  They all have extremely high amplitude EEGs relative to
VD>> the
FA>>> database.  We are getting extremes in z-scores for both absolute and
FA>>> relative power.  Absolute readings are very high magnitude across
VD>> locations
FA>>> in almost all frequency bands (>3sd) (least in alpha and theta).
VD>> Relative
FA>>> power scores are extremely low across most all frequency bands (>-3sd).

FA>>> According to the database, these children are so extremely abnormal is
VD>> these
FA>>> regards, yet normal in the criteria for our study (theta/beta ratios).
VD>> And
FA>>> the results are consistent for all 4 of the children we have recorded
VD> at
VD>> the
FA>>> children's center.  However, the adults we have recorded in our lab
VD>> rooms
FA>>> look as we would expect them to.

FA>>> We get these same results whether we EOG correct and save as a .dat
VD> file
VD>> or
FA>>> import the Mitsar file into NeuroGuide and use auto-select.  We have
VD> not
FA>>> manually artefacted these files at all. 

FA>>> These data are so peculiar that I am concerned that we are doing
VD>> something
FA>>> wrong.  On a more positive note, the ERPs for the TOVA are running
VD> well.
VD>> I
FA>>> have yet to sort out audio for the oddball task, but that should go
VD>> easily.

FA>>> We are interviewing for David's position right now.  It is quite a blow
VD>> to
FA>>> us that he is leaving.  I am planning to work through the rest of the
VD>> time
FA>>> he is here and until after a replacement starts in. Would the 3rd week
VD>> in
FA>>> Sept be a reasonable time to visit St. Petersburg.  I have friends from
VD>> home
FA>>> who want to go.  I'd love to see St P and stop by the Institute as
VD> well.

FA>>> Thanks for any help.

FA>>> All the best,
FA>>> annie

FA>>> Ann Frick
FA>>> Imperial College London
FA>>> Dept of Cognitive Neuroscience and Behaviour
FA>>> Charing Cross Campus
FA>>> St Dunstan's Road
FA>>> London W6 8RP
FA>>> phone 0208-846-7281
FA>>> fax   0208-846-1670 

Best regards,
 Juri                            mailto:kropotov@xxxxxxxxxx

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