I would suggest that if the brain was split at birth, the appearance that
there were two persons inhabiting the same body would be harder to avoid.
It would be like conjoined twins.

Due however to the fact that the brain is split in people who've already
formed their identity - and assuming that the neural correlates for
personal identity are distributed throughout the brain - it seems clear to
me that even if it turns out to be true that split-brain folks really are
two different persons, it's much harder to detect, since the personality
would be encoded consistently in both halves prior to the operation.

That said, it's easy for me to imagine that there could be two minds,
supervening on the two halves, which over time could diverge and
potentially develop conflicting goals with one another.  Take the opening
sentence of this article
<http://www.npr.org/sections/health-shots/2017/06/15/532920899/the-roots-of-consciousness-were-of-two-minds>
:

After surgery to treat her epilepsy severed the connection between the two
> halves of her brain, Karen's left hand took on a mind of its own, acting
> against her will to undress or even to slap her.


Clearly the two halves are not entirely causally closed with respect to one
another, but without the corpus callosum, there may be enough isolation to
treat them *as if *they give rise to distinct persons.

It's like a duplication experiment, without duplicating the body. And the
asymmetries in terms of language processing and other left/right brain
differences make it a rather imperfect duplication. But still it makes me
wonder... is there FPI as a result of the surgery?

On Tue, Oct 3, 2017 at 9:11 AM, Telmo Menezes <te...@telmomenezes.com>
wrote:

> I think this is quite interesting, although the article is a bit
> superficial.
>
> https://aeon.co/ideas/when-you-split-the-brain-do-you-split-the-person
>
> If the conclusions are valid, I would say they put emergentism in
> trouble...
>
> Cheers,
> Telmo.
>
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