Dolphins etc.

bob jacobs bjacobs at RIKKI.CC.COLORADO.EDU
Thu Jul 28 14:50:28 EST 1994


>From: ssl7091 at ocvaxa.cc.oberlin.edu (We have met the enemy, and they are
>      illiterate.)
>
>I disagree with the comparison of split-brained humans to dolphins,
>but it's possible that this comparison was presented because I wasn't
>clear enough in my original post.  From what I understand about split-
>brained humans, no one suggest that one OR the other hemisphere was
>active at once; indeed, at least in Sperry's and Sperry-type tests, it's
>obvious that the two hemispheres are active simultaneously.  In dolphins,
>the suggestion is that they use one OR the other side at any given time
>(I don't know if it's known/hypothesized if the other side of the brain
>is asleep or in some other state), so that a great degree of circuitry
>would have to be duplicated , present in both hemispheres, and thus in
>essence they would/do have two brains, of which they alternate use.
>I haven't the slightest idea if motor and/or sensory wiring in dolphins
>is configured such that this theory is tenable.  I just heard, read, and
>noted these ideas...
>-Sarah Leupen
>
>-------------------------------------------------------------------------------
>I think there may be some misunderstandings here.  Dolphins exhibit this
>hemisphericity when "sleeping" presumably because, as someone has already
>noted, their breathing is voluntary.  It is extremely unlikely that this is
>the normal state of affairs for the AWAKE animal.  Consequently, the
>split-brain analogy still makes the point. 

Bob Jacobs
Bjacobs at rikki.cc.colorado.edu





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