Hello i am going through an EEG file that i recorded using the Mitsar and after completing the automatic EOG correction i wanted to go through the raw trace myself and cut out any very noisy sections. I Managed to do this using the mouse and the scissors symbol on the tool bar. When i do this a bold blue line appears at the bottom of the raw EEG file. However, when i then run the analysis it gives exactly the same output as a raw EEG that i have not gone through and removed the additional artefacts. Thus i must be missing something out. I have checked the manual but can find no reference to manual artefact rejection using the cut tool. Can you help me please, what do i have to do to make sure that the sections i have cut are not included in the analysis? thanks david David J Vernon PhD Dept. of Cognitive Neuroscience & Behaviour Imperial College London St Dunstan's Road London W6 8RP Tel: 44 (0) 208 383 0584 Fax: 44 (0) 208 846 1670 -----Original Message----- From: Juri D. Kropotov [mailto:kropotov@xxxxxxxxxx] Sent: 03 July 2003 16:05 To: Vernon, David Subject: Re[2]: data issues OK, David. I'll check it and ask my server to enlarge my mail-box. Juri VD> Hi Juri, VD> i cannot send you the data files, as everytime i have tried they just 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 out VD> by sending the file to Annie and she received it. I tried again to send 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 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 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 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 file VD> or FA>> import the Mitsar file into NeuroGuide and use auto-select. We have 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 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 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