Eric Wassermann ewass at helix.nih.gov
Tue Jul 26 11:20:04 EST 1994

In article <CtJvIo.FJ9 at murdoch.acc.Virginia.EDU>,
asa3h at galen.med.Virginia.EDU (Adam Stephen Arthur) wrote:

> I ran across an interesting thing about dolphin brains last
> year.  Appparently their two hemispheres are alternately
> active.  The original reference was (if I remember correctly)
> in Penrose's "The Emperor's New Mind" but I ran it down and
> found it quite fascinating.  EEG recordings showed delta wave
> patterns in one hemisphere (sleep?) while the other was active
> and vice versa.  The supposition was that since they are
> aquatic mammals, this was a mechanism to keep them moving at
> all times; the organism as a whole never slept.  The
> possible implications for human hemisphericity are interesting.
> I'd love to hear if anyone knows whether other species (aquatic
> mammals or otherwise) do anything similar from someone out
> there who studies this sort of thing.

Birds do it (but not bees or educated fleas).

Eric Wassermann
Human Motor Control Section, NINDS, NIH

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