Home built EEG

Kevin Spencer kspencer at iti.org
Thu Jul 28 11:10:16 EST 1994

sjacobs at maroon.tc.umn.edu (Steve Jacobson) writes:

>I am building an EEG machine and intend to digitize the amplified analog signals for input into a 
>computer.  I am considering using a 16 bit A/D for each channel.  The question I have is: Is a 16 
>bit A/D overkill?  Is 12 bits sufficient.  What kind of voltage range am I liable to encounter on 
>the EEG electrodes?  I intend to use isolation devices between the front-end 
>processor and the main computer.

>Any advice would be appreciated.

12 bits is plenty for good amplitude resolution.  I'd say the voltage
range of raw scalp-recorded EEG would be +/- 1000 uV.  (Just a guess,
since I study ERPs and seldom look at unfiltered single trials of EEG.)

Kevin Spencer
Cognitive Psychophysiology Laboratory and Beckman Institute
University of Illinois at Urbana-Champaign
kspencer at p300.cpl.uiuc.edu / kspencer at psych.uiuc.edu

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