From: peterson_at_d...
Date: 2001-06-13 16:31:10
--- In buildcheapeeg_at_yahoogroups.com, "frans smith" <f.smith_at_c...> wrote:
> Hi,
> Simpel question.
> Is the shape of a brainwave important ???
> Can i just use a sinus 14hz, to act as a brainwave at 14hz ?.
> That is, to use the signal to build software ?
> (not raw brainwaves) but just software wich respond when
> a special brainwave frequency is present, not diagnostic.
> thanks
> frans
For our purposes, I think you can use a sine wave to represent the
brain signal. However, as a sort of side-note, some theorists do
think that the shapes of the waveforms are important because they can
indicate the presence of harmonics, which would be indicative of
otherwise concealed higher-frequency patterns. Thus a "saw-toothed"
theta wave might have a different clinical meaning than a square-wave
delta, etc., or at least these theorists say so. I've heard Joel
Lubar and Marvin Sams discussing this issue and disagreeing with each
other. However, I know of no commonly available neurofeedback
equipment that is capable of distinguishing one waveform from another
"on the fly." This is accomplished, at least in the biofeedback
world, by "eyeballing" the raw wave forms. No feedback systems
exist, to my knowledge, which would provide differential feedback
based on wave form characteristics. Once again this motley pack of
brilliant amateurs has found its way onto the front lines of the
field. Hope this is helpful.
This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:31 BST