I found out about the term Aphantasia in 2015 from the BBC News article on the subject, and that was quite a mind boggling thing, given I’d not appreciated that people were actually able to internally visislise memories or abstract thought, and always assumed people were talking metaphorically.
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However like Zach mentions above, I too have robustly experimented with psilocybin mushrooms & DMT, so I can provide some input on my experiences.
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I have no internal visualisation ability normally, although I do dream with visual imagery, and occasionally as I’m drifting off to sleep, I do see some fleeting images; so I gather my internal imaging circuits do work, just appear not to be engaged in normal wakeful states.
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My psychedelic experiences stretch back over 20 years or more, however I became much more interested in their potential after learning what I did in 2015, and how they could let me experience what others take for granted.
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To summarize there does seem to be a threshold you have to cross to be able to experience any images with closed eyes (CEV’s) on mushrooms.
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The usual guide dosages (3-4g) do not have any CEV results for me. I would experience moving patterns with open eyes at this dose, but still internally black. However once this is doubled to 6g plus, then CEV occurs strongly for around 20-30 minutes, and increases in intensity as the dosage increases. For normal non-aphants this would seem like a high doseage, but I suspect for aphants this is the threshold dose.
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Non aphants seem to report much longer lasting effects, but for me this always seems limited around the half hour mark. So I assume there must be a much higher threshold required to unlock the internal images.
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As Zach also mentions, the lack of structure in these visualisations..Fractals, patterns etc. Certainly that was my experience at first, as if my brain did not know how to put an image together, and so it was all abstract..
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However with time, and many repeated journeys, this has developed into very coherent imagery every time. City scapes, tropical islands, intricate flyovers, people, animals etc..so I feel this is simply my brain having to learn to use the stimuli effectively. I’ve read similar stories for blind people who have had imaging sensors implanted into their brains to give rudimentary sight, at first it is all abstract, but gradually the brain learns to put it together.
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DMT has had similarly very effective results, but lasts for only a few fleeting minutes before returning to black.
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Legality issues aside, I am extremely thankful for having been able to experience what I have seen internally with these journeys; to see how the other half live every day without a second thought, for which otherwise I would almost certainly never have been able to.