Error when I tried to import Neuroscan cnt file

Bugs
1

Hi,

My Neuroscan cnt file was recorded with 10kHz sampling frequency, and when I tried to import this dataset into brainstorm, I got this error:


saying that index exceeds matrix dimensions.

Would you please help me figure this out?

For your information, I can easily import data using 1kHz sampling frequency.

Thank you!

-Kai

2

Hi Kai,

Could send me this file so I can have a look at it?
Upload it somewhere (eg. dropbox) and send me the link in a separate email (click on my username on this forum).

Thanks
Francois

3

Hi Francois,

The link has been sent to you:)

Best,
-Kai

4

Hi Kai,

Thank you for sharing this file with me.
The function I was using for reading the .cnt file header was not ready for handling files > 2Gb. I fixed it based on the recent modifications to the EEGLAB function loadcnt.m.

Please update Brainstorm and try again (menu Help > Update Brainstorm).
You might observe other weird things while working with large files. If it happens, let me know and I’ll try to fix it.

Cheers,
Francois

5

Hi Francois,

Thank you for helping fix this. I will update the software and give another try:)

Best,
-Kai

[QUOTE=Francois;10904]Hi Kai,

Thank you for sharing this file with me.
The function I was using for reading the .cnt file header was not ready for handling files > 2Gb. I fixed it based on the recent modifications to the EEGLAB function loadcnt.m.

Please update Brainstorm and try again (menu Help > Update Brainstorm).
You might observe other weird things while working with large files. If it happens, let me know and I’ll try to fix it.

Cheers,
Francois[/QUOTE]

6

Hi Francois,

I just noticed another possible bug when I try to use the newest version BrainStorm to import a 30-min NeuronScan EEG CNT file (sampling frequency: 20 kHz). Once it is imported, the time window is only 475 sec, so it seems to me that the data are not complete. Would you please advise how I can see the whole dataset?

Thank you!

Best,
-Kai

[QUOTE=Kai Yu;10905]Hi Francois,

Thank you for helping fix this. I will update the software and give another try:)

Best,
-Kai[/QUOTE]

7

Hi Kai,

Can you share this file with me so I can have a look at it?

Thanks,
Francois

8

Sure. Please let me know if you can download it.

https://www.dropbox.com/s/asrjt96z1vik8xc/Aug10_MEG_EEG_5V_3ms.cnt?dl=0

Thanks,
-Kai