BioSemi.nl

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.

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...

Thank you. This is helpful.

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...

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...

Hi Alexandre, Yes Mode 7 with the conventional pin electrodes. Sure, I analysed it in MATLAB. Jittering and Adjarring is in the pipeline. T.

Dear Coen,

Thank you very much, that works!

Tom.

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...

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...

Hi,

I hope that this article is of interest:

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

Best regards,

Tom.

Dear Coen,

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

Best regards,

Tom.

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...

thank you

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

Dear Coen,
Thank you very much.
Best regards,
Tom.

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...

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.

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 ...