OpenVibe – Part 3

Note, see OpenVibe – Part 1 and OpenVibe – Part 2

Now a walk-through (Part 3 of 3) of using your Mindwave and OpenVibe to save a sample of your brainwaves to a file.

Start “openvibe designer”, then open your acquisition-signal-display.xml” and your acquisition-file-csv.xml”

Capture1

Start Neurosky’s “Thinkgear Connector”, and make sure the “Starting port” is correct.

Capture4

Start “openvibe acquisition server”, and choose a driver “Neurosky Mindset”

Capture2

Click on “Driver Properties”, and make sure the “COM Port” is correct” and you’ll want a “Sampling frequency” of 512.

Capture3

Click on “Connect”, then once it is connected, click on “Play”.

Capture4

Going back to the “openvibe designer”, click on “Acquisition-Signal-Display.xml”, then click on the little arrow at the top menu, and a box with pop up showing your brainwaves! To stop, click on the little box at the top menu.

Capture5

Next click on “Acquisition-File-CSV.xml”, then double-click on the “CSV File writer” to remind you that (as previously saved in Part 2) the file will be “c:/OpenVibe/hello.csv” and close the CSV File Write Settings box.

Capture6

Click on the the little arrow on at the top menu and start recording your brainwaves to a file. Wait for however long you want the recording, then click on the little box at the top menu, to stop recording.

Now, I would stop OpenVibe, take off the Mindwave, and have a look at “c:/OpenVibe/hello.csv”. Using Excel, here is what the file looks like:

Capture7

You’ll notice that all the information is in one column. To move the info into separate columns:

  • highlight the one column with all the info
  • click on “Data” in the top menu
  • click on “Text to Columns”
  • the column wizard pops up, choose “Delimited”, then click on Next
  • checkmark semicolon (and uncheck tab), then click Next
  • then click on “Finish”

Capture8

You’ll notice under “Sampling Rate”, it says 512. That means there are 512 records per second , which is the standard for EEG machines. Under “Electrodes” is the raw data, and under “Attention” and “Meditation” are the numbers showing home much your brain is focused or relaxing (based on a Neurosky algorithm).

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To graph one second, delete all the info after line 513, then highlight the columns, click on “Insert” and then click on “Scatter”, then choose “Scatter with Smooth Lines”

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One second of your brainwaves graphed:

Capture11

So what does this graph mean? I haven’t a clue, but it is a good first step on the journey to understanding brainwaves.

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14 thoughts on “OpenVibe – Part 3

  1. Hi!
    I followed your instructions except when I stop recording I can’t find the CSV file. Does is save automatically or do I have to do something else?
    Thank you!

    Liked by 1 person

    • Hi Alannah, sorry to take so long to reply!

      Make sure you also follow the instruction in Part 2, which describes how to set where
      the CSV file is saved to. And Part 1 might also be helpful.

      https://alphagammawaves.wordpress.com/2014/11/26/openvibe-part-2/

      The Openvibe software works great, but it is sooo complicated to use. I’m hoping to
      provide software that will save to a CVS file but that is more user-friendly. Hopefully
      it will be available later on this year.

      Good luck with your endeavors,

      Katie

      Like

  2. Hi,

    I have successfully connected to openVibe using mindwave mobile on Windows 7. But when I run “acquisition-signal-display.xml”, it returns an error “Vertical scale must be > 0”. I have checked the vertical scale in the dialog that opens on double-clicking signal display box. It is set to 100. What can be a possible solution?

    Like

    • Hi vsl

      My understanding is that the Mindwave Headset (Not the Mindwave Mobile) only works with Windows XP, Windows Vista and Windows 7. So if you are using Windows 10 it won’t work, I would try switching to Windows 7 or XP.

      For collecting readings I would also recommend the Mindwave Reader512:
      http://brainwaves.io/wp/reader512-2/reader512-help/
      But it too would only work with Windows 7 or XP.

      Best of luck!

      Katie

      Like

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