EEG artefacts: 'mind' or just muscle activity?
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- เผยแพร่เมื่อ 5 มิ.ย. 2024
- It is important to be able to distinguish between EEG and, for example, muscle activity in times where people claim to read the 'mind' but often just register facial muscle activity or eye movements.
Muscle activity (EMG) is in the region of 1mV whereas EEG is in the region of 10uV, thus 100 times smaller. Both, EEG and EMG cover similar frequency ranges. Both, EEG and EMG are hard to control consciously. Electric fields from the surrounding area such as mains cables induce voltages in the cables of about 100mV and therefore about 10,000 times stronger than any EEG. Ideally the differential amplifier takes care of these influences but when moving around this is not 100% accurate so that movement artefacts might look like slow EEG waves. Eye movements are the third problem which have also pretty high amplitudes in the region of 1mV.
Overall EMG is the main problem because it is always there (except in totally paralysed patients) and it is tricky (though not impossible) to gauge what is EMG and what is EEG. Ideally it requires a subject to consciously minimise their EMG and at the same time is able to control their EEG.
Presenters: Vasso Georgiadou & Cat MacLeod
biosignals.berndporr.me.uk - วิทยาศาสตร์และเทคโนโลยี
does the brainwave frequency in the programming language have the code? is it still in the frequency language, i.e. delta 1-4hz and so on?
and are colors recognized by the programming language? are the terms in the language? is it recognized in frequency terms?
i am building an open source EEG device. Can i get help about what is exactly inside that black box which she i calling a differential amplifier?
i'll be greatfull
just check out biosignals.berndporr.me.uk
An op amp probably lol
and whether the brain frequency can be recognized in other parts of the body? because it is connected with the body's other nervous system? is it recognized by the fixed frequency of Brainwave?
instablaster.
How can you detect both EMG and EEG? Which sensor did you use?
One always detects both EMG and EEG as they are both electrical signals. The electrodes are standard Ag/AgCl electrodes.
What's the name of the graphic IDE you are using to plot the signals?
+lucas Sousa That's "comedirecord". Just google it. It's open source and runs under Linux.
+EIGEN PRODUCTIONS thank you I've already check it :D
can brain frequency be scanned now without wires or wireless networks? and can be scanned through the brain and other body parts?
yepp, its already done
I'm in love
Brian captur power se brain capture kiya ja raha hai isme brain me se audio video dikhai deta hai Kolhapur Maharashtra pls help me
Just sit still and meditate. Can somebody demonstrate this on a kundalini yogi?
No way of making them higher. Need to reduce the EMG by relaxing or just doing it with locked in patients. Botox might also help!
Can't you reduce the range of Hz that you are observing by applying a filter? I mean, we know at what ranges we should expect the eye movement artifacts and EMG artifacts, then by filtering those out (removing them) it would hypothetically lead to the EEG signal that you want to observe?
its easy to debug eeg signal to what is brain or what is muscle. you need to think about lets say a cat, then record a segment of what the pattern start with when thinking about cat using a clock timer to start the reading of the eeg to end. then you need to store this pattern in a array and then classify the array as cat. then next time the person thinks about cat, if your lucky the computer will print out cat. if not, its not working but i think it does. when someone can drive a rc car witht their mind, sure, there is some correspondence between taught and the pattern of the eeg.
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to read eeg, just make some electrodes, then make a analog volt detector and then hook it up to a adc microcontroller that can talk to usb by com emulation and then program the chip to send the numbers to the pc and use a serial read app in c or python that reads serial data and then write the code that prints the graph on the screen. don't buy the tecg, just build it.
you can make your own eeg the classic old polygraph method as well. just make a motorized paper feeder and then use a needle with a pencil on the end, then make a sensitive volt meter that then connect electrodes to you skin, then connect the voltage signal to a audio amplifer that you can make with some transistors, then connect the output of the audio amplifier to a speaker or graphite speaker and connect that to a metal horn that is connected to the needle and then power up and start printing. you need a roll of paper to feed the feeder and your polygraph eeg chould print the same brain signal. they could have done this in the 1700s if they were just smart enough as they had the technology back then to do it, just not the imagination.
ok thanks :D