Elpo said:
Nathanial.Dread said:
In humans, this area is far more developed then in other animals, so they realistically wouldn't experience as extreme a sense of ego-loss, simply because their egos are pretty large to begin with.
Could you tell us more about this? From your explanation I would expect the ego of an animal to be smaller than ours...
Sure: the anterior cingulate cortex (the ACC) is part of the larger cingulate cortex, the closest to the front of the brain.
It has a number of different hypothesized functions, which include everything from error detection, to pain perception, to reward-based learning. It's role on conscious awareness is not very well understood, but it seems to have a role in modulating the conscious awareness of mental and emotional states.
In short, the 'you' that feels certain things is made aware that it is aware by the actions of the AAC. Patients who have had damage to the ACC will oftentimes exhibit symptoms similar to autism or schizophrenia, both of which are notorious for a blunted emotional affect and a dissociation from external stimuli.
The AAC also appears to have a role in mediating the degree to which you identify with the universe around you. When activity in the AAC is depressed (as it is on psychedelics), the brain identifies more closely with the world: things seems 'more important,' or 'personal.' Conversely, many people suffering from depression have overactive AACs, which might mean that they cannot identify with things external to themselves. To someone with an overactive AAC, the world would seem alternately 'wrong' or totally devoid of intrinsic meaning and value.
As a life-long depression suffer, let me tell you, there's a lot to that. With an overactive AAC, it's easy to ask 'what's the point,' because, to your brain, nothing really matters.
This brings us all the way back to psychedelic drugs, which studies at Johns Hopkins on psilocybin have shown will depress activity in the AAC. While on a serotonergic psychedelics, activity in the AAC (and the entire left hemisphere) is massively damped. One of the effects of this is a breakdown of the brains ability to adequately tell the difference between itself and the universe.
This sense of emotional oneness with the universe comes from a joint damping of the AAC and the posterior superior parietal lobe (PSPL, which does the hard work of physical orientation and figuring out where the physical body stops and the world begins).
That's why psilocybin might be such an effectively antidepressent.
The AAC is only very developed in humans, great apes, and (weirdly) cetations and elephants.
Blessings
~ND