on 29/03/2006 00:47, Manuel Viet at oly@xxxxxxxxxx, wrote:
> To know your dominating eye, just point at something with your finger, arm
> extended, two eyes open. Then close one eye, then the other. The eye matching
> the aim and the finger is the dominant.
[snip]
> I don't know how it fits in your biological theroy, but I think (for me) that
> being left or right eyed is very similar to (if not always linked to) being
> right or left handed, and I find it painful to try to guide myself on my
> right eye only. It's not linked to the quality of vision, as I've been tested
> far above average on both eyes, none being really better than the other.
Eye-dominance test could demonstrate that it shows itself when performing a
praxia requiring the coordination of motor cortex and visual cortex, and
it's not a property of the visual cortex itself.
Unlike motor cortex, which crosses to move the opposite part of the body and
is heavily either left or right and shows a strong dominance (perhaps
related to where Broca's speech area is); Visual cortex is only half-crossed
regarding its input, and visual -> motor linkage tends to show a preference.
I've just tried this other test: blind the dominant eye, and point your
(dominant) finger to an aim. It may need two or three trials, but I managed
to match the aim accurately. I'm coming to another conclusion: eye-dominance
should develop after right/left handedness is stablished; and in this
neurophysiological fiction, after Broca's area is settled.
But of course, the existance of exceptions are the rule... :)
Fernando.
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|