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[OM] Re: Switching eyes...

Subject: [OM] Re: Switching eyes...
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxx>
Date: Tue, 28 Mar 2006 22:48:06 -0500
Well, that's just exactly what I thouht too.  Glad we're in agreement. :-)

Chuck Norcutt


Fernando Gonzalez Gentile wrote:
> Perhaps not the best idea to get into these details here, but just can't
> help it since I thought over on this topic this afternoon.
> My point is that having a dominant eye needs a different neurological
> explanation from being right/left/ambidextrous handed.
> If a person is right-eyed, the right 50% of the retina (temporal half) of
> his right eye and the right 50% of the retina of his left eye (nasal half)
> will input the right occipital lobe of his brain.
> But when a person is right-handed, most neurons of '4' left motor cortex
> area will input his right arm muscles, and sensitive nerves from right arm
> will input his left parietal cortex. Dr.Penfield was the first to find out
> how those areas are drawn onto the cortex surface.
> At the moment, I don't find why a right-eyed person should be either
> right-handed or left-handed; this, even taking into account that the
> external (and almost sure about, the internal - but don't feel like getting
> into autonomous inervation now) muscles that move the eye-globe receive
> their input from three cranial nerves which first neuron are located in the
> lower brain and, AFAIK, don't cross to the opposite part - they're
> ipsilateral.
> Eye dominance should be, in my very humble opinion, easier to switch since
> it only involves sensorial information from the 2nd cranial pair, and very
> simple motor coordination from the 3rd, fourth and sixth cranial pairs.
> Sensorial input to each occipital lobe should be very similar, I'd say
> _must_ be very similar.
> Perhaps we're accustomed to name an eye as 'dominant' just because it's
> easier to keep it open while looking at something, because of better control
> of its eye-lid, whose muscles receive input from neurons of '4' left motor
> cortex area, just as the right hand does.
> Complex coordinated movements starting from visual input and generating
> (left or right-preferred) motor response, may also justify the nomenclature
> I'm discussing here. Furthermore, these complex coordinated movements may
> start from a right-handed-easyness and then monitored by one preferred
> eye...
> Hope this makes sense to anyone, I didn't use spell checker and won't read
> it twice. Opinions welcomed.
> 
> Fernando.
> 
> on 28/03/2006 14:00, Tim Hughes at timhughes@xxxxxxxx, wrote:
> 
> 
>>I don't always use the same eye but often use left, even though I am nominally
>>RHanded.
>>If I shoot a rifle it gets interesting as I put the rifle butt to the right
>>shoulder and usually
>>use left eye. I was somewhat ambidexterous as a child. I used to write on the
>>right page with my
>>right hand and on the left page with my left hand. Whatever you do seems to
>>get to feel natural
>>eventually, I think.
>>Tim Hughes
>>
>>--- Michael Collins <l43g20th@xxxxxxxxxxxx> wrote:
>>
>>
>>>I've been right-handed and right-eyed all my life, as far as a camera is
>>>concerned, but all of a sudden need to become right-handed/left-eyed.
> 
> 
> 
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