I think these binaural observations are connected a neurological iceburg, to put it mildly. I've been reading this thread and connecting it to other seemingly unrelated areas of neurological phenomena, and it's starting to feel like a technological crystalization is about to occur. I think it would be useful to begin with a summary of reported effects (which I have also experienced, so it's good not to be alone and totally crazy). These effects apply to isochronic and binaural alike, I think; obviously sound rendering issues complicate the analysis in the context of multitasking operating systems.
MEDITATIVE ENTRY & TECHNICAL EFFECTS
You can't just listen to the sound as though you're listening to a dial tone or a song. You have to "push back" against it, perhaps by generating the same sound using your imagination, so that some sort of intraneuronal resonance occurs. This resonance must build for seconds or tens of seconds in order to invoke the measurable gamma power amplification effect on EEG; failing this resonance, no such EEG burst would be measured IMO. The resonance may not be sufficient, but it is necessary.
Next, there is something described as "nasal pressure" or a feeling that one's head is physically expanding. This, and a flareup of goosebumps, is IMO the indicator that a meditative transition has occurred. The measurable effect of this appears to be an increase (roughly an order of magnitude) in gamma EEG power; some may experience a rough frequency doubling, as well.
Time compression is frequently reported, and I've experienced the same. It stands to reason that time perception is inversely proportional to gamma synchrony frequency, if in fact Stuart Hameroff is on the right track with his theory that gamma pulses correlate to instants of consciousness. Experiencing meditation is like living somewhere between ambient time and bullet time.
When the tone stops, there is an unmistakable deflative effect for some of us, myself included. This probably reflects a lack of proficiency with meditation; experienced practitioners should be unmoved by nonthreatening external stimuli.
"It doesn't work." If you don't do (at least) the above, then it's all just an annoying sound.
LONGTERM EFFECTS
Emotional blunting. Superficially, this contradicts the reports of experienced meditators feeling more compassionate and developing their sense of empathy. But (1) the type of meditation is paramount in this regard and (2) emotional blunting is not contradictory to increased empathy; to the contrary, it can indicate that one is making morality decisions based on more globally oriented thinking, so that dispassionate local actions might actually be prompted by a more global analysis thereof, for example, feeding the family cat on commodity cat food because feeding it fish would cause harm to fish stocks and release more CO2.
Reduced sex drive. Unsurprising. Deep meditation is better than sex.
Hearing impairment. Unless the sounds are played at painfully high volume, which would damage the auditory cilia, this is likely due to neuronal rejection of constant components of the sound, in just the same way that the eyes adjust themselves to the mean lumosity of a scene by altering pupil diameter. The effect should be reversible, if it matters.
Burnout. If you experience this, perhaps it's because you're depleting a neurotransmitter. I doubt that meditation produces significant oxidative stress above and beyond the "respiration tax".
Visual experiences. Deep meditation is IMO highly visual. Under circumstances of extreme focus and minimal distraction, it becomes the perceptile equivalent of reality itself, with all five senses firing at full resolution. Rapid visual modeling, shape morphing, temporal shifting, and sometimes higher dimensional spatial navigation is possible. IMO modeling 4 spatial dimensions is tough, but meditating topologists would probably excel in this regard.
IT'S ALL PLACEBO
Placebo is the inadvertent art of creating physiological benefit from mental processes alone. Meditation is surely that; techniques such as auditory tones which ease meditative entry are transitively placebo as well. But the effects are real, as seen on EEG, fMRI, magnetoencephalography, and even pulse rate; placebo does not mean "ineffective".
EEG evidence of an effect is weak at best. This is unsurprising. If Hameroff is on the right track, then we are upregulating macroscale quantum entanglement (perhaps mediated by dendritic pore coupling), so most of the benefits will not radiate environmentally measurable effects in any immediate sense. (In one of his videos, he mentioned a study of psylocibin (sp?), in which users reported extremely vivid meditative experiences, despite subbaseline fMRI activity, strongly suggesting enhanced entanglement and concommitant reduction in measurable ULF emission.) However, cognitive remodeling will occur over time, so improvements should be evident. I think existing studies clearly demonstrate longterm fMRI changes. But more data is needed concerning effects on areas other than emotional stability, such as working memory, response latency, etc. We have some good anecdotes, but I think we can do better in the future.
WHERE FROM HERE?
We're obsessing too much about waveform, binaural vs isochronic, power spectrum, background music, etc. Ultimately we couldn't care less about what happens to our EEG. We want global cognitive enhancement. Auditory tones are part of the answer. But ideally this should be a very personalized biofeedback process: modulate your own "neuromusic" in order to target specific enhancements. Use tools like Cambridge Brain Sciences, Lumosity, etc. to measure the effects, not to mention daily introspection. In the absence of realtime audio sculpting tools (whose use might itself interfere with the objective), we could at least try various frequencies or chords and try to measure the effects in subsequent days.
Simultaneously engaging in LLLT, particularly with pulsed as opposed to continuous light, might achieve synergistic benefit; to my knowledge, no one has tried this. OTOH it might be possible to blow one's brains out with exogenously driven gamma of sufficient amplitude; tweak carefully!
If it's essentially true that gamma frequency controls the rate of time perception, then perhaps what we really need is specialized artificial ganglia (at first, merely epigenetically enhanced neurons) which can respond to very high frequencies, so that we can experience some sort of interesting life on very short timescales. This would result in "intragevity": extending one's local lifespan independent of the surrounding temporal rate. One could imagine a Moore's Law of intragevity, whereby we could obtain clinical immortality merely by increasing the frequency of mental processing in the absence of any life extension technology whatsoever. No doubt, any such technology would exert asymmetrical cognitive influences. For example, maybe we could create a pineal gland capable of operation at 40 Hz (so it works with the rest of the brain) or 40 GHz under optical excitation; in this manner, we could be happy for millions of (local) years, despite being cut off from perceptile systems during meditation.
Edited by resveratrol_guy, 05 December 2014 - 03:58 AM.