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http://www.cell.com/current-biology/abstract/S0960-9822(15)00266-3?cc=y
Given sufficient biotech, I would definitely want to try being an octopus for a while. Does this seem possible? If so, how much about being an octopus could I remember when (if?) I went back to being human?
It seems badly defined. It's not clear in what sense you could be an octopus.
What does seem to be possible is adding extra arms and limbs. Our brains seem to be capable of integrating new things. But even if you would be given 8 tentacles that wouldn't make you an octopus.