Reproduce previous data

[Lapsus16]

The attached figure shows the results of an analysis that I cannot reproduce. The white trace is the real EEG data (1 channel) which was superimposed independetly (CorelDraw) to show the data and the frequency respone. The data were originally in Axon BF format. I run an FFT analysis and then used the scriot for Joint frequency analysis. I can provide the axon file by FTP if you tell me how to send it, it's too big as an atachemnt for this email.

Thanks

[Brad_Turpin]

Hi Lapsus16,

It would be useful if you would send the Axon_ABF data file.  Please post it to ftp.ni.com/incoming.  The best way to do this is with WINDOWS Explorer, not Internet Explorer.  It is possible in DIAdem to reproduce the picture you posted.  Is it important that the time series data be within the Join Time Frequency plot, or could it just as well be above it or below it on a separate graph?  The easiest way to accomplish this in any case is to put the time series data on a separate graph from the Joint Time Frequency graph.  If you really want the time series data floating on top of the Joint Time Frequency graph, then we can arrange the two graphs on top of each other and make the time series graph axes invisible, etc.  It is also possible to put both plots on the same graph, if that is important, but it's a little harder.

Brad Turpin
DIAdem Product Support Engineer

National Instruments

[Lapsus16]

I am uploading by FTP a file named Dex8concatenated.atf, in Axon text file format. See what you can do in terms of importing it etc. Thanks

Damir

[Lapsus16]

Now to your questions:

What I am trying to show is how amplitudes at certain frequencies change over time. Hence, the X axis is time (from, for example, the injection of a seizure promoting agent), the Y axis is the frequency of the EEG at selcted time intervals (how do I control for these?) and the color plot is the amplitude of the signal. Does this make sense to you?

Damir

[Brad_Turpin]

Hi Damir,

Yes, your described analysis makes plenty of sense.  I would have preferred a binary ABF file, but I was able to load the slower and larger ASCII file you sent.  Here is my initial JTFA analysis of your data-- zoomed in on the region of interest that contains the 3 significant peaks.

I think it would make the most sense to continue this discussion via email-- feel free to ask your next questions that way using brad.turpin@ni.com.

Brad Turpin

DIAdem Product Support Engineer
National Instruments