From: peterson_at_d...
Date: 2001-03-08 23:43:27
Yaniv--I believe that the "crossover" phenomenon refers to a
condition where alpha and theta amplitudes are equal, rather than to
a specific frequency. Usually, in most people's typical EEG
patterns, alpha is stronger than theta. You might have 20 uV of
alpha & 10 of theta, for example. However, sometimes theta amplitude
rises to match or exceed that of alpha, and if you were to graph the
alpha and theta traces over time, theta would "cross over" alpha.
Some equipment allows clients to mark the points in time when
significant mental events, such as traumatic memories or important
mental imagery, happen, and it was noticed that these psychological
events tend to correspond in time to alpha-theta crossovers. It is
therefore assumed that these are times when people have especially
good access to their unconscious processes. The state of alpha-theta
crossover is also good for creativity, for "oceanic" feelings, and
for intense spiritual experiences. The usual way to get there is via
alpha-theta training. Elmer Green did a lot of clinical work with
people in this state. He talks about some of the spiritual and
paranormal experiences his people had in a paper called "Experimental
Vipassana," which he has presented at several conferences, most
recently at the 2000 annual meeting of the AAPB (Association for
Applied Psychophysiology and Biofeedback). At that conference Elmer
told me that he was working on a book called _The Ozaukee Book of the
Dead_ (I don't know the publisher offhand). Hope this information is
useful.
--Jim Peterson
--- In buildcheapeeg_at_yahoogroups.com, yaniv_vi_at_yahoo.com wrote:
> hi
> i read alot of very interesting things about the crossover
frequency
> (between alpha and theta) , could a nfb pro share his knowldge
about
> this frequency 's propertty's and uses , and where to study this
> more ?
>
>
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