EEG ECOG Electroencephalography
<p>May 21, 2009 5:45 PM
 
delta is  4 or less
theta is 4 to 8    (my mnemonic  death  since these are really slow waves like sleep)
alpha is 8 to 12
beta is 12 to 30
gamma is over 30  (gamma oscillations are conventionally at 40 as an average)
high gamma is over 70.
 
(the quirky names are due to history... in Hans Berger's time  it was just alpha and beta with
alpha  ?  < 15 and beta more than 15.
 
see my notes below from Robt Knight's talk at Stfd
 
<<<
ECoG   ecog.... <b> electrocorticography </b>..... totally cool; brand new for me.
 
1929:  Hans Berger  discovers the  eeg.   Labels for bands have evolved.
 
First labeling  (eg in 1936)   <b>alpha was everything below 15 hz</b>;   <b>beta was everything above 15 hz</b>.
 
1942   delta was the really slow stuff; 1 to ?;  alpha was ? to 15;  beta was 15 to 30;  and gamma was 30 to 50;
 
Ultra gamma is really where the money is!!!  that's the band ?  65 hz.
 
Look at Gray and Singer's work on BINDING...  they think binding occurs via oscillations.
(he seems to agree);   Fries is another important theorist.
 
They pass a GABOR filter over their recordinds  (do correlation of  a gabor filter) to
compute a power spectrum  (how much energy is at each frequency from 1 to  say  150 hz or so.>>>></p>