> > What do gamma frequeincies relate to ? alertness ?
> > relaxation ? and what freq range do they fall into in comparison
to
> alpha, beta, etc


There has been some intriguing research on the correlation of Gamma
with various PSI phenomenon. Some notes I have about a study
entitled ""40 Hz" brain activity, consciousness, and psi found the
following curious results:

"EEG data recorded from 22 frequent gamblers while they
played a laboratory, video-gambling game. On each hand,
four "cards" were presented sequentially in the center of a
video screen using an interstimulus interval of 2600 ms and
a stimulus duration of 330 ms in counterbalanced wager and
nonwager blocks. Then, subjects guessed which card would
later be selected as the target by a computerized, random
process. Guessing accuracy was at chance level, p = .465,
one-tailed binomial. EEG analyses focussed on 40 Hz power
in the 150-500 msec latency window following delivery of
the target and nontarget cards. ANOVAs indicated greater
40 Hz power for targets than for nontargets over left-
frontal scalp in both wager and nonwager conditions,
F (1/21) = 7.87, p = .005, and over the right-posterior
scalp in the wager condition, F (1/21) = 5.81, p = .013,
both one-tailed.

These findings indicate that

1) 40 Hz activity is involved in the processing of psi
information.

2) the attentional mechanisms of the brain utilized in
focused arousal are also utilized in processing psi
information in the wager condition, although the
left-frontal effect, found in both wager and nonwager
conditions, is unlike the posterior-parietal locus of
40 Hz effects observed by Sheer. Neither the left
frontal nor the right parietal loci of effects overlay
primary sensory areas of the cerebral cortex,
suggesting that the 40 Hz effects we observed were
not due to sensory processes.

The present EEG findings are consistent with the notion of
unconscious or preconscious psi. Guessing accuracy was at
chance level and yet 40 Hz activity following target and
nontarget stimuli differed significantly. Thus, although
conscious behavior was not influenced by psi information,
the differential brain responses indicated recognition at
some level that the stimuli belonged to different
categories. These findings in the frequency domain support
and extend our previous findings with event-related brain
potentials."

-Enjoy
-emc

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