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We should first distinguish between specifically communicative signals
and those which may be unintentionally informative signals.
informative signals : Someone
listening to you may become informed
about you through a number of signals
that you have not intentionally sent.
She may note that you have a cold
(you sneezed), that you aren’t at ease
(you shifted around in your seat), that
you are disorganized (non-matching
socks)
communicative signals : When you
use language to tell this person, I’m
one of the applicants for the vacant
position of senior brain surgeon at the
hospital, you are normally considered
to be intentionally communicating
something