roger at anatsg1.unil.ch
Mon Aug 8 12:02:13 EST 1994
In article <CtypFv.ILJ at murdoch.acc.Virginia.EDU> asa3h at galen.med.Virginia.EDU (Adam Stephen Arthur) writes:
>From: asa3h at galen.med.Virginia.EDU (Adam Stephen Arthur)
>Subject: Re: Dolphin sleep
>Date: Wed, 3 Aug 1994 13:57:31 GMT
>I think its fabulous that one idiotic post here has turned into
>some truly intriguing info/speculation. While I am not
>completely certain of all the implications of "unihemisphereic
>sleep" I find it fascinating.
It was meant to be provocative (and light hearted). We are at least now
talking about dolphins instead of trying to talk to them.
I am very concerned about mechanisms of sensory encoding and in particular,
how completelydifferent sensory modalities are processed by neural cortex
which is essentially homogenous.
Consider, for example, how different are the processes of phototransduction,
somatosensory perception, acoustic and sonar detection. While all of these
modalities have common elements (frequency, phase etc) the apparently enormous
differences are not manifest in the cortical anatomy.
Without knowledge of cerebral localization it is not easy (possible) to
describe by purely anatomical/histological to which modality a particular
piece of cortex belongs. There are always exceptions to this, of course, such
as the whisker-to-barrel projection in the mouse and several other mammals
including the kangaroos and wallabies. To emphasize this point a little
further one can cause visual pathways to grow into different (eg auditory)
cortical regions and still obtain what appear to be normal visual responses.
Faculte de Medicine
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