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I know it has nothing to do with PD, but thought it was kind of interesting.
Ray
Rayilyn Brown
Director AZNPF
Arizona Chapter National Parkinson Foundation
[log in to unmask]
----- Original Message -----
From: "Richard W. Rice" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, August 31, 2008 7:18 AM
Subject: Re: Eyes evolved for x-ray vision
> This article is not related with PD.
>
>
> Sent via BlackBerry by AT&T
>
> -----Original Message-----
> From: rayilynlee <[log in to unmask]>
>
> Date: Sat, 30 Aug 2008 18:56:09
> To: <[log in to unmask]>
> Subject: Eyes evolved for x-ray vision
>
>
> Study says eyes evolved for X-Ray vision
> August 29, 2008
>
> Troy, N.Y. - The advantage of using two eyes to see the world around us
> has
> long been associated solely with our capacity to see in 3-D. Now, a new
> study from a scientist at Rensselaer Polytechnic Institute has uncovered a
> truly eye-opening advantage to binocular vision: our ability to see
> through
> things.
>
> Most animals - fish, insects, reptiles, birds, rabbits, and horses, for
> example - exist in non-cluttered environments like fields or plains, and
> they have eyes located on either side of their head. These sideways-facing
> eyes allow an animal to see in front of and behind itself, an ability also
> known as panoramic vision.
>
> Humans and other large mammals - primates and large carnivores like
> tigers,
> for example - exist in cluttered environments like forests or jungles, and
> their eyes have evolved to point in the same direction. While animals with
> forward-facing eyes lose the ability to see what's behind them, they gain
> X-ray vision, according to Mark Changizi, assistant professor of cognitive
> science at Rensselaer, who says eyes facing the same direction have been
> selected for maximizing our ability to see in leafy environments like
> forests.
>
> All animals have a binocular region - parts of the world that both eyes
> can
> see simultaneously - which allows for X-ray vision and grows as eyes
> become
> more forward facing.
>
> Demonstrating our X-ray ability is fairly simple: hold a pen vertically
> and
> look at something far beyond it. If you first close one eye, and then the
> other, you'll see that in each case the pen blocks your view. If you open
> both eyes, however, you can see through the pen to the world behind it.
>
> To demonstrate how our eyes allow us to see through clutter, hold up all
> of
> your fingers in random directions, and note how much of the world you can
> see beyond them when only one eye is open compared to both. You miss out
> on
> a lot with only one eye open, but can see nearly everything behind the
> clutter with both.
>
> "Our binocular region is a kind of 'spotlight' shining through the
> clutter,
> allowing us to visually sweep out a cluttered region to recognize the
> objects beyond it," says Changizi, who is principal investigator on the
> project. "As long as the separation between our eyes is wider than the
> width
> of the objects causing clutter - as is the case with our fingers, or would
> be the case with the leaves in the forest - then we can tend to see
> through
> it."
>
> To identify which animals have this impressive power, Changizi studied 319
> species across 17 mammalian orders and discovered that eye position
> depends
> on two variables: the clutter, or lack thereof in an animal's environment,
> and the animal's body size relative to the objects creating the clutter.
>
> Changizi discovered that animals in non-cluttered environments - which he
> described as either "non-leafy surroundings, or surroundings where the
> cluttering objects are bigger in size than the separation between the
> animal's eyes" (think a tiny mouse trying to see through 6-inch wide
> leaves
> in the forest) - tended to have sideways-facing eyes.
>
> "Animals outside of leafy environments do not have to deal with clutter no
> matter how big or small they are, so there is never any X-ray advantage to
> forward-facing eyes for them," says Changizi. "Because binocular vision
> does
> not help them see any better than monocular vision, they are able to
> survey
> a much greater region with sideways-facing eyes."
>
> However, in cluttered environments - which Changizi defined as leafy
> surroundings where the cluttering objects are smaller than the separation
> between an animal's eyes - animals tend to have a wide field of binocular
> vision, and thus forward-facing eyes, in order to see past leaf walls.
>
> "This X-ray vision makes it possible for animals with forward-facing eyes
> to
> visually survey a much greater region around themselves than
> sideways-facing
> eyes would allow," says Changizi. "Additionally, the larger the animal in
> a
> cluttered environment, the more forward facing its eyes will be to allow
> for
> the greatest X-ray vision possible, in order to aid in hunting, running
> from
> predators, and maneuvering through dense forest or jungle."
>
> Changizi says human eyes have evolved to be forward facing, but that we
> now
> live in a non-cluttered environment where we might actually benefit more
> from sideways-facing eyes.
>
> "In today's world, humans have more in common visually with tiny mice in a
> forest than with a large animal in the jungle. We aren't faced with a
> great
> deal of small clutter, and the things that do clutter our visual field -
> cars and skyscrapers - are much wider than the separation between our
> eyes,
> so we can't use our X-ray power to see through them," Changizi says. "If
> we
> froze ourselves today and woke up a million years from now, it's possible
> that it might be difficult for us to look the new human population in the
> eyes, because by then they might be facing sideways."
>
> Rensselaer Polytechnic Institute
>
>
> Rayilyn Brown
> Director AZNPF
> Arizona Chapter National Parkinson Foundation
> [log in to unmask]
>
> ----------------------------------------------------------------------
> To sign-off Parkinsn send a message to:
> mailto:[log in to unmask]
> In the body of the message put: signoff parkinsn
>
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Week 4 June 1999, Week 3 June 1999, Week 2 June 1999, Week 1 May 1999, Week 5 May 1999, Week 4 May 1999, Week 3 May 1999, Week 2 May 1999, Week 1 April 1999, Week 5 April 1999, Week 4 April 1999, Week 3 April 1999, Week 2 April 1999, Week 1 March 1999, Week 5 March 1999, Week 4 March 1999, Week 3 March 1999, Week 2 March 1999, Week 1 February 1999, Week 4 February 1999, Week 3 February 1999, Week 2 February 1999, Week 1 January 1999, Week 5 January 1999, Week 4 January 1999, Week 3 January 1999, Week 2 January 1999, Week 1 December 1998, Week 5 December 1998, Week 4 December 1998, Week 3 December 1998, Week 2 December 1998, Week 1 November 1998, Week 5 November 1998, Week 4 November 1998, Week 3 November 1998, Week 2 November 1998, Week 1 October 1998, Week 5 October 1998, Week 4 October 1998, Week 3 October 1998, Week 2 October 1998, Week 1 September 1998, Week 5 September 1998, Week 4 September 1998, Week 3 September 1998, Week 2 September 1998, Week 1 August 1998, Week 5 August 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Week 4 October 1997, Week 3 October 1997, Week 2 October 1997, Week 1 September 1997, Week 5 September 1997, Week 4 September 1997, Week 3 September 1997, Week 2 September 1997, Week 1 August 1997, Week 5 August 1997, Week 4 August 1997, Week 3 August 1997, Week 2 August 1997, Week 1 July 1997, Week 5 July 1997, Week 4 July 1997, Week 3 July 1997, Week 2 July 1997, Week 1 June 1997, Week 5 June 1997, Week 4 June 1997, Week 3 June 1997, Week 2 June 1997, Week 1 May 1997, Week 5 May 1997, Week 4 May 1997, Week 3 May 1997, Week 2 May 1997, Week 1 April 1997, Week 5 April 1997, Week 4 April 1997, Week 3 April 1997, Week 2 April 1997, Week 1 March 1997, Week 5 March 1997, Week 4 March 1997, Week 3 March 1997, Week 2 March 1997, Week 1 February 1997, Week 5 February 1997, Week 4 February 1997, Week 3 February 1997, Week 2 February 1997, Week 1 January 1997, Week 5 January 1997, Week 4 January 1997, Week 3 January 1997, Week 2 January 1997, Week 1 December 1996, Week 5 December 1996, Week 4 December 1996, Week 3 December 1996, Week 2 December 1996, Week 1 November 1996, Week 5 November 1996, Week 4 November 1996, Week 3 November 1996, Week 2 November 1996, Week 1 October 1996, Week 5 October 1996, Week 4 October 1996, Week 3 October 1996, Week 2 October 1996, Week 1 September 1996, Week 5 September 1996, Week 4 September 1996, Week 3 September 1996, Week 2 September 1996, Week 1 August 1996, Week 5 August 1996, Week 4 August 1996, Week 3 August 1996, Week 2 August 1996, Week 1 July 1996, Week 5 July 1996, Week 4 July 1996, Week 3 July 1996, Week 2 July 1996, Week 1 June 1996, Week 5 June 1996, Week 4 June 1996, Week 3 June 1996, Week 2 June 1996, Week 1 May 1996, Week 5 May 1996, Week 4 May 1996, Week 3 May 1996, Week 2 May 1996, Week 1 April 1996, Week 5 April 1996, Week 4 April 1996, Week 3 April 1996, Week 2 April 1996, Week 1 March 1996, Week 5 March 1996, Week 4 March 1996, Week 3 March 1996, Week 2 March 1996, Week 1 February 1996, Week 5 February 1996, Week 4 February 1996, Week 3 February 1996, Week 2 February 1996, Week 1 January 1996, Week 5 January 1996, Week 4 January 1996, Week 3 January 1996, Week 2 January 1996, Week 1 December 1995, Week 5 December 1995, Week 4 December 1995, Week 3 December 1995, Week 2 December 1995, Week 1 November 1995, Week 5 November 1995, Week 4 November 1995, Week 3 November 1995, Week 2 November 1995, Week 1 October 1995, Week 5 October 1995, Week 4 October 1995, Week 3 October 1995, Week 2 October 1995, Week 1 September 1995, Week 5 September 1995, Week 4 September 1995, Week 3 September 1995, Week 2 September 1995, Week 1 August 1995, Week 5 August 1995, Week 4 August 1995, Week 3 August 1995, Week 2 August 1995, Week 1 July 1995, Week 5 July 1995, Week 4 July 1995, Week 3 July 1995, Week 2 July 1995, Week 1 June 1995, Week 5 June 1995, Week 4 June 1995, Week 3 June 1995, Week 2 June 1995, Week 1 May 1995, Week 5 May 1995, Week 4 May 1995, Week 3 May 1995, Week 2 May 1995, Week 1 April 1995, Week 5 April 1995, Week 4 April 1995, Week 3 April 1995, Week 2 April 1995, Week 1 March 1995, Week 5 March 1995, Week 4 March 1995, Week 3 March 1995, Week 2 March 1995, Week 1 February 1995, Week 4 February 1995, Week 3 February 1995, Week 2 February 1995, Week 1 January 1995, Week 5 January 1995, Week 4 January 1995, Week 3 January 1995, Week 2 January 1995, Week 1 December 1994, Week 5 December 1994, Week 4 December 1994, Week 3 December 1994, Week 2 December 1994, Week 1 November 1994, Week 5 November 1994, Week 4 November 1994, Week 3 November 1994, Week 2 November 1994, Week 1 October 1994, Week 5 October 1994, Week 4 October 1994, Week 3 October 1994, Week 2 October 1994, Week 1 September 1994, Week 5 September 1994, Week 4 September 1994, Week 3 September 1994, Week 2 September 1994, Week 1 August 1994, Week 5 August 1994, Week 4 August 1994, Week 3 August 1994, Week 2 August 1994, Week 1 July 1994, Week 5 July 1994, Week 4 July 1994, Week 3 July 1994, Week 2 July 1994, Week 1 June 1994, Week 5 June 1994, Week 4 June 1994, Week 3 June 1994, Week 2 June 1994, Week 1 May 1994, Week 5 May 1994, Week 4 May 1994, Week 3 May 1994, Week 2 May 1994, Week 1 April 1994, Week 5 April 1994, Week 4 April 1994, Week 3 April 1994, Week 2 April 1994, Week 1 March 1994, Week 5 March 1994, Week 4 March 1994, Week 3 March 1994, Week 2 March 1994, Week 1 February 1994, Week 4 February 1994, Week 3 February 1994, Week 2 February 1994, Week 1 February 1994 January 1994 December 1993 November 1993
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