Nicita said:
Infundibulum said:
The dogma is that nerve cells do not divide and thinking most certainty does not create any new nerve cells.
This opinion is outdated.
There is definitly cell division going on, even in adult brains. However this does not mean that these findings are not of great significance for us. Proving that tryptamines (and maybe other psychedelics) facilitate regenration of neurons would be amazing and may catch the attention of many neuroscientist. This would be a first biological explanation of the beneficial effects of psychedelics to a human being. All we have until now is: "Most of the consuments feel that it has a positive impact on them and it seems to help us in certain therapies."
"Tryptamines cause the growth of new neurons." would be a big step ahead! :thumb_up:
Yes, there is strong supporting evidence for natural adult neuronal cell division in the hippocampus, olfactory bulbs, cerebellum, and subventricular zone, and here is some evidence for neurogenesis in the primate neocortex.
http://www.princeton.edu/~cggross/Science_286_548_1999.pdf
The gist of Infundibulum's point actually holds though, since the great majority of neurogenesis is completed within 20 years of birth. Neurogenesis after this seems to be mainly in a memory forming capacity. (including of course both implicit and explicit memory) This is not to denigrate the incredible potential of the human mind, which speaks for itself on this website.
In any case, I completely agree that it would be a big step forward to correlate tryptamines with an increase in the rate of neuronal change.
benzyme said:
this is a slightly tongue in cheek search
like I said, it's common knowledge (did you not know about it?)
the brain creates new cells on its own, this isn't a magical property attributed exclusively to psilocybin.
I don't think psilocybin magically creates a shift in global perspective in its users either, not everyone changes how they see the world. it's up to the user to integrate what ever he/she gets out of the experience.
I am aware of and agree with the hypothesis that you are referring to. That it might be called "common knowledge" is not really relevant to a scientific discussion.
Please also note Infundibulum's point that you are confusing dendritic connections with cell divisions, or at least not making it clear that you are talking about two very distinct physical changes.
Furthermore, the search that you provided, or at least the first page, is also irrelevant to my question: has anyone compared dendritic growth in critical versus non-critical thinkers? It was tongue in cheek because we're not going to kill humans and slice up their brains to check out their dendritic growth, and I'd be interested in someone's take on what makes a mouse's thought more critical. (maybe we can collect all the ones that try to escape their cages?)
I suspect psychological-level evidence is the closest we'll come to showing that critical thinking increases our capacity for though in general at this point in time. After all, critical thinking is a behavioral measure- we'd need to correlate brain structure with psychological data before even being able to interpret the implications of increased dendritic connections or neurogenesis.
Back to the topic, go Mr Peabody! That is really amazing anecdotal evidence for exactly the sort of changes in brain function that the original video is interested in, and it is very exciting to me personally.