EEG – brainwaves.io

Noise from Electricity – Part 2

Published February 26, 2017 by katie356

KOB (see Gallery-KOB) noticed that the automatic gain control (ACG) doesn’t work as well in Europe. As pointed out in Noise from Electricity – Part 1 the ACG reduces any peaks caused by the electricity in the walls (60 Hz in the USA and a few other countries and 50 Hz in the rest of the world). KOB lives in Europe and if you look at his readings they do tend to have small peaks at around 50 Hz, for example “KOB eyes closed”, 5th second:

Mindwave512-KOB-eyes closed.csv 5.83 MB

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Luckily these peaks are small enough that they shouldn’t have much of an effect on the overall results. My understanding is that the Mindwave was developed in the U.S.A., and it could very well be that its ACG is more sensitive to the American 60 Hz, and less sensitive to the European 50 Hz.

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Brainwave-JCP

Published January 18, 2017 by katie356

Joël Caserus (aka Brainwave-JCP) a prolific EEG enthusiast has kindly posted a page about the Brainwave Analyzer: http://www.joel-caserus.net/brainwave-analyzer/ He also writes about the mind at:…

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How to Calculate EEG Bands

Published November 7, 2016 by katie356

EEG Bands

EEG readings are divided up in EEG bands: Delta, Theta, Alpha, Beta and Gamma (from slowest to fastest).

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How to Calculate Frequencies and Amplitudes

Published October 24, 2016 by katie356

This is what a one second sample of brainwaves looks like when graphed: one-second-graph

So based on these squiggly brainwaves, how do we calculate frequencies and amplitudes?

Luckily mathematicians have come up with a solution called “Spectrum Analysis using Fourier transform”. The basic idea is that every wave, no matter how complex and irregular, can be represented by combining a number of simple (sine and cosine) waves.

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EEG and 5 Activities

Published October 17, 2016 by katie356

5 new samples for 5 activities:

Playing 3-D Pong http://www.ponggame.org/3dpong.php
Watching a movie “Back to the Future” http://www.imdb.com/title/tt0088763
Playing Concentration: http://www.mathsisfun.com/games/memory/
Reading a novel
Playing acoustic guitar by ear

Not surprisingly my test subject’s brainwaves were most engaged while playing guitar and must less engaged while watching a video. What did surprise me was how little his brainwaves were engaged while playing 3-D Pong. (Click on the graphs to enlarge.)

If you have access to an EEG reader, please let me know if you have similar or different results!

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OpenVibe – Part 3

Published January 4, 2015 by katie356

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”

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

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

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

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

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OpenVibe – Part 2

Published November 26, 2014 by katie356

Note, here is OpenVibe – Part 1

This next part is about creating two boxes (processing algorithms), one to view your live brainwaves, and one to save the brainwave readings to a file (to be used for later analysis).

Box 1 – Signal Display

The first step is to start the OpenVibe Designer, and open the “generic-stream-reader.xml” (if you are not sure how, see OpenVibe – Part 1).

Create an OpenVibe folder C:OpenVibe

Next Save the “generic-stream-reader.xml” as “acquisition-signal-display.xml” in the C:OpenVibe folder.