On 4 May 2013 14:28, Dan Henry <rdanhenry@...
> The difficulty for bioradio communication is that communicative abilities
> evolve to use existing sensory capabilities. Radio senses will only evolve
> in an environment in which practically useful radio data exists fairly
> consistently over long periods of time. It may well be that an environment
> that would favor such senses would produce life too alien for us to
> understand their psychology in any depth, much less imagine it from our
> armchairs. Or not. It depends on how universal our own notions of
> intelligence prove to be. One has a great deal of freedom in speculating on
> alien biology/psychology, as we are extrapolating from a single reference
> point of terrestrial evolution.
Perhaps they come from a planet in a binary (or formerly binary)
system around a pulsar, which puts out quite a but of radio energy.
That would pretty alien. Or maybe there're just a lot of large storms,
and being able to sense lightning flashes from far away is useful.
I think we can get a bit more prosaic than that, though. Earthly
lifeforms can produce pretty strong electrical charges, and can detect
very faint electrical charges incidentally produced by the activity of
other animal's nervous systems, but our nerves somewhat oddly don't
actually work on electrical conduction. It's not too difficult to
imagine alien life that *does* have electrically conductive nerves
(electrically conductive biomolecules are not particularly hard to
come by), in which case the starting and stopping of current in their
nervous systems would produce faint incidental radio emissions which
other animals could sense for hunting purposes.
> If you wanted to actually work out such a system of natural radio language,
> you'd do best to start by figuring out what the radio sense was originally
> evolved for. Communication would probably use frequencies near those of the
> sources of interest, but not the same frequencies, so that communications
> and navigational (or whatever) radio did not interfere.
I'm not sold on that. Human sonic language isn't distinguished from
other natural sounds by being in an offset frequency range, but by
having different frequency mixture characteristics.