Noam Chomsky once wrote that it is part of the
“human essence to be capable of learning only the languages whose syntactic rules satisfy the constraints of certain linguistic universals”. [1986]
We
could ask here if a possible language-less Tony Blair might still
have been a human being according to Chomsky’s stipulations. However, according to another stipulational
definition, Tony Blair might still have been a human in that same
possible scenario. It depends on how strong we take Chomsky’s modal term
“capable” ( as in “human essence to be capable of learning...”) to be.
Take
the letters “H” and “L” as standing for “is human” and
“is a user of specified language L”. So Tony Blair (if at another
possible world, W, at time t) might have come across the required
stimulations that engendered the use of language L. However, this
conclusion still relies on Chomsky’s stipulation of the sortal
[human] and his further stipulation that the language-use of L is the
essence of humanhood.
Of course we need to accept such a stipulational definition of the sortal [human] in order to make sense of humans at other possible worlds. And even if we accept Tony Blair via the sortal [human] at other possible worlds, the possible entities would still not be Blair qua Blair at these worlds. It's essential that Blair - via the sortal [human] - is capable of learning language L, or even Blair qua individualised particular (to use Leibniz's term) that he's capable of learning language L. If Blair had existed at another possible world only via the sortal [human], it wouldn't actually be Blair at that other possible world because what makes Blair, Blair, is the individualising of him as a particular.
Of course we need to accept such a stipulational definition of the sortal [human] in order to make sense of humans at other possible worlds. And even if we accept Tony Blair via the sortal [human] at other possible worlds, the possible entities would still not be Blair qua Blair at these worlds. It's essential that Blair - via the sortal [human] - is capable of learning language L, or even Blair qua individualised particular (to use Leibniz's term) that he's capable of learning language L. If Blair had existed at another possible world only via the sortal [human], it wouldn't actually be Blair at that other possible world because what makes Blair, Blair, is the individualising of him as a particular.
Perhaps
Blair has (or has had) Lewisian “counterparts” at other possible
worlds; though, again, only via the sortal [human] or via the sortal [person]
(or via any other lower-order sortal). Blair via Chomsky’s sortal
[human] at another possible world would be an entity of some kind: a
human, who might have - or has - learned language L... and that’s
it. Period. (If, of course, the sole criterion of Chomsky’s sortal
[human] is that it must be capable of learning language L.) Blair qua
human or qua person wouldn't necessarily have the same
shape, size, beliefs or dispositions as Blair at our actual world. So
what right have we to say that Blair qua Blair exists at other
possible worlds? We could accept, for now, a “counterpart”;
though that counterpart wouldn't share with Blair what makes Blair an
individualised particular. In that case, possible Blairs could only
share the sortal [human] and the quasi-sortal [language-user-of-L]
with actual Blair, according to Chomsky’s stipulations (which are
very thin). We could apply more criteria of identity to the sortal
[human]; but that wouldn't allow the multiple instantiations (as it
were) of Blair qua Blair at other possible worlds. And if
possible Blairs aren't Blairs who've been individualised as being
Blair, then there could be no genuine possible Blairs at other
possible worlds.
The sortal [human] could also be stipulated to include the
individualising micro-sortals [tool user] and [entity with two legs].
Blair shares these conceptual requirements with all other humans on
earth. So Blair as an individualised particular couldn't have
possible world duplicates; though he could have, as said, Lewisian
counterparts. What makes Blair, Blair, is that
he's taken qua Blair (i.e., taken as an individualised
particular). And part of the individuating conditions of Blair qua
Blair at another planet (not another possible world!) is the fact
that he was brought up on an uninhabited planet where the required
stimulations needed for learning language L weren't there. And, of
course, if there were a possible world that's also the exact
duplicate of Blair’s world (i.e., ours), and Blair’s planet
(ours), and a world that also duplicated both Blair’s our-world
conditions and Blair himself, then such a world
wouldn't work as a possible world as they are generally understood.
If worlds are “ways things could be or could have been” (Lewis,
1973), then this duplicate possible world W is a duplicate of
the actual world. Therefore it wouldn’t be an example of “how
things could be or of how things could have been”. This world W
would be identical to our world, and therefore actual Blair’s
essence couldn't be found by investigating (or stipulating) a
possible Blair at world W. One of the main points of possible
worlds, therefore, disintegrates. This is the only way I can think of
where we could find actual Blair’s essence – by investigating or
stipulating other possible worlds which aren't duplicates, rather
than investigating Blair’s essence qua Blair (as an
individualised particular). We couldn't find actual-Blair’s essence
via the sortal [human] or the sortal [person]. These sortal essences
don’t provide us with the essence of actual Blair qua actual
Blair.
Perhaps,
again, Blair doesn't even have non-identical counterparts at other
possible worlds. After all, what if a particular counterpart, c¹,
shares humanhood with actual Blair? c¹ would also share
humanhood with every other human on earth. Similarly, if c¹
shares personhood instead with actual Blair, then he must also
share personhood with every other person on earth. And the
same is true of lower-level sortals such as [two-leggedness] or [those
who believe in God]. c¹ would share these thinner sortals with
billions (though not all) persons on earth, and indeed at other
possible worlds. Though when we come to c¹ sharing properties with
actual Blair that he doesn't also share with numerous other people on
earth (or even with just one single person), then c¹ would also need
to live at world W with its duplicate conditions. And, as
said, such duplications wouldn't serve the explanatory and modal
purposes that possible worlds are supposed to play in defining and
determining essences across possible worlds: i.e., what actual-Blair must
share with all possible-Blairs is what
constitutes his essence.
References
Chomsky, Noam. (1986) Knowledge of Language.
Lewis,
David. (1968) 'Counterpart
Theory and Quantified Modal Logic'.
-- (1973)
'Possible Worlds', from Counterfactuals.
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