In conclusion, I wish to advance the possibility that the cognitive style I have called dialogic consciousness might correspond, on the biological level, to specific activity of the two cerebral hemispheres. We could perhaps start from the hypothesis that controled dissociation implies a detached functioning of both hemispheres, which generates, simultaneously, a higher observational function. It might be said that dialogic consciousness generates a dual, symmetrical perception of reality. Under the influence of ayahuasca, the body seems to be numb and awake at the same time; the eyes percieve reality as though they were out of focus, but they record stimuli much more precisely than in the normal state of consciousness; the mind unveils thoughts and at the same time observes the creative process; etc. If we had to express this process and structuring in an image, the most suitable one would be that of the DNA double helix (as M. Harner timidly pointed out years ago). Every historical moment, has sought and found the most appropiate image in accordance with prevailing values, in order to describe the inner processes on which human behaviour could be based; this always takes a forma! structure similar to that of DNA. Sometimes it was the Biblical snake twined around the Tree of Knowledge, at others the mythical boa of Amazonian indigenous societies (FERICGLA, 1994), at still others the double-headed life-giving snake, in the Imperia] Egyptian tradition (NARBY,1995:104). In all this imagery, we can find a similarity in form to our representation of DNA. Am I attempting to describe, perhaps, in contemporary terrns, the same evolutionary and adaptive process of the human being in relation to Nature made self-conciouss? This is probably not an opportune question, rather the answer itself.