tymoteusz3 said:

Sheeno said:

I suspect all this is related to dreams.

Take a congenitally blind person - someone blind at birth whose brain never once assimilated the concept of visual perception. At night, these people dream too, but they have strong auditory, olfactory and tactile hallucinations; visuals do not play a part.

Someone who has become blind midway through their life, whose brain (whether consciously or subconsciously) could once visually perceive do also visually dream. These non-congenital blind people do, however, note that the longer they've been blind for, the hazier the visual aspect to their dreams and the more accentuated the other senses become.

I reckon this would be the same with tripping. A completely congenitally blind person would have no visual aspect to their trip as their brain cannot comprehend the very concept of visual interpretation. One who has developed blindness at a later stage in life, however, would have a visual aspect to some degree.

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Are brains are SO cool.
So many people don't realize just how amazing we really are.

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And alien species realize we aren't amazing at all because we can't spell 'our'.

Tetriana said:

Effects of a Hallucinogenic Agent in Totally Blind Subjects:

http://www.lycaeum.org/research/researchpdfs/1094.pdf

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Good find.

So blind people can trip out, visually.
And it seems some trip out harder than people with vision!
At least via other senses, which makes sense.