Search found 18 matches

by tom_campbell75
Mon Feb 13, 2012 7:04 pm
Forum: BioSemi Hardware
Topic: universal pops
Replies: 2
Views: 2668

Dear Coen,

Thank you very much for your response. I found one defective flat active electrode. Removing the electrode from the system and replacing it with another active electrode seemed to correct the issue.

Best regards,
Tom.
by tom_campbell75
Fri Feb 10, 2012 5:31 pm
Forum: BioSemi Hardware
Topic: universal pops
Replies: 2
Views: 2668

universal pops

Posted here as this could be a hardware problem. Dear Coen, Please find depicted at the URL below a some curious artifact in our EEG, which we would very much appreciate if you could identify and suggest solutions. http://i.imgur.com/2yMZT.png The artifact looks like a very high amplitude pop, but a...
by tom_campbell75
Wed Jan 11, 2012 4:47 pm
Forum: BioSemi Hardware
Topic: Chair potentiometer; trigger duration recommendation Sp.Mo.4
Replies: 4
Views: 3833

Thank you. This is helpful.
by tom_campbell75
Wed Dec 14, 2011 6:37 pm
Forum: BioSemi Hardware
Topic: Chair potentiometer; trigger duration recommendation Sp.Mo.4
Replies: 4
Views: 3833

Dear Coen, Thank you very much for your helpful advice. I take it that pin 32 of the trigger port on the USB receiver outputs a series of short pulses at 2048Hz in speed mode 4. This we should use to control the sampling of the position of the chair potentiometer by a separate ADC that then send a p...
by tom_campbell75
Thu Dec 08, 2011 8:37 pm
Forum: BioSemi Hardware
Topic: Chair potentiometer; trigger duration recommendation Sp.Mo.4
Replies: 4
Views: 3833

Chair potentiometer; trigger duration recommendation Sp.Mo.4

Dear Coen and colleagues, Please I would appreciate and answers to a question about the minimal trigger duration in speed mode 4. We would like to record EEG with millisecond accuracy of event timing. We would like to send TTL codes that encode the position of a horizontally moving chair in which th...
by tom_campbell75
Fri Jul 15, 2011 11:49 pm
Forum: BioSemi Hardware
Topic: ABR / ERP simultaneous recording
Replies: 5
Views: 6537

Hi Alexandre, Yes Mode 7 with the conventional pin electrodes. Sure, I analysed it in MATLAB. Jittering and Adjarring is in the pipeline. T.
by tom_campbell75
Sat Jul 02, 2011 12:20 am
Forum: BioSemi Software (ActiView executable)
Topic: switching from XP 32 bit recording PC to Window 7s 64 bit
Replies: 7
Views: 6878

Dear Coen,

Thank you very much, that works!

Tom.
by tom_campbell75
Thu Jun 23, 2011 12:36 am
Forum: BioSemi Software (ActiView executable)
Topic: switching from XP 32 bit recording PC to Window 7s 64 bit
Replies: 7
Views: 6878

Dear Paul and Coen, Thank you very much for your replies. Bill Gates's shoulders are broad... Below I document what happened when attempting installation on a new 64-bit Windows 7 machines as described above and then the analagous slightly different situation when installing on a 32-bit Windows 7 ma...
by tom_campbell75
Tue Jun 21, 2011 11:39 pm
Forum: BioSemi Software (ActiView executable)
Topic: switching from XP 32 bit recording PC to Window 7s 64 bit
Replies: 7
Views: 6878

Dear Coen, I tried: 1) installing the current USB driver driver [url]http://www.biosemi.com/download/USB%20drivers%20Windows%2064bit/Windows%2064bit.zip[/url] 2) installing Actiview 7.00 : [url]http://www.biosemi.com/download/LatestActiView/ActiView700-Vari/ActiView700-Vari.zip[/url] 3)installing La...
by tom_campbell75
Mon Jun 13, 2011 4:41 pm
Forum: BioSemi Hardware
Topic: ABR / ERP simultaneous recording
Replies: 5
Views: 6537

Recording ABRs, cABRs and MLRs in speed mode 7

Hi,

I hope that this article is of interest:

http://sccn.ucsd.edu/eeglab/refs/Campbell11.pdf

Best regards,

Tom.
by tom_campbell75
Wed Jun 01, 2011 6:40 pm
Forum: BioSemi Software (ActiView executable)
Topic: switching from XP 32 bit recording PC to Window 7s 64 bit
Replies: 7
Views: 6878

Dear Coen,

Thank you very much for this helpful response. We will try it.

Best regards,

Tom.
by tom_campbell75
Wed Jun 01, 2011 3:31 pm
Forum: BioSemi Software (ActiView executable)
Topic: switching from XP 32 bit recording PC to Window 7s 64 bit
Replies: 7
Views: 6878

switching from XP 32 bit recording PC to Window 7s 64 bit

Dear Coen, Please I would very much appreciate if you can advise us before we make any mistakes in buying recording PCs for our ActiveTwo systems with which we would acquire data with ActiView. We are considering changing our two very old 32-bit recording PCs running XP to some new recording PCs run...
by tom_campbell75
Mon May 23, 2011 3:35 pm
Forum: BioSemi all other topics
Topic: stickers
Replies: 2
Views: 3179

thank you
by tom_campbell75
Wed May 18, 2011 9:43 pm
Forum: BioSemi all other topics
Topic: stickers
Replies: 2
Views: 3179

stickers

Hi,

Please could you recommend a North American supplier of the kind of stickers for attaching flat electrodes to the canthi of the eyes?

Best regards,

Tom
by tom_campbell75
Thu Jul 15, 2010 5:54 pm
Forum: BioSemi Hardware
Topic: bandwidth speed mode 4 decimation 1/4: 104, 134 or ?
Replies: 2
Views: 2804

Dear Coen,
Thank you very much.
Best regards,
Tom.
by tom_campbell75
Mon Jul 12, 2010 6:31 pm
Forum: BioSemi Hardware
Topic: bandwidth speed mode 4 decimation 1/4: 104, 134 or ?
Replies: 2
Views: 2804

bandwidth speed mode 4 decimation 1/4: 104, 134 or ?

Dear all, Please I ask for you help in answering a question about bandwidth on the ActiveTwo Speed Mode 4 with decimation 1/4 that leads to a sampling rate of 512 Hz. Various sources of information seem contradictory. We would like to report the bandwidth used for recording in a manuscript. We belie...
by tom_campbell75
Mon Jan 25, 2010 6:20 pm
Forum: BioSemi Software (LabVIEW programming)
Topic: bdf channel extraction
Replies: 2
Views: 8323

bdf channel extraction

Dear all,

I have had a look through some of the LabView utilities, but I do not think that any of them can extract one EEG channel from a bdf file, so as to save this as a (much smaller) bdf file containing just one channel.

Please, your suggestions are welcome.

Kind regards,

Tom.
by tom_campbell75
Fri Dec 04, 2009 1:07 am
Forum: EEG data analysis
Topic: 'raw' reference ERP in BESA
Replies: 0
Views: 3383

'raw' reference ERP in BESA

Dear all, I write with a query concerning the BESA software, which I would be very grateful for responses to. We are working with ERPs derived in BESA 5.1 from .bdf files recorded with and Active-2 with the 'raw' reference. We would like use 'top data viewer' from the view menu to plot the ERPs for ...