Stereo Perception with a Single Eye

Written by Charles Douglas Wehner


Continued from page 1

A pigeon, to land, needs stereopsis in a triangular region in front and below. The cheeks ofrepparttar pigeon are hollow to allowrepparttar 126188 optical axis of each eye to "sneak" pastrepparttar 126189 beak, allowing a small area of overlap for precision landing.

Otherwise,repparttar 126190 pigeon has eyes that give a panoramic view with little overlap.

This leads to obvious danger. What happens whenrepparttar 126191 pigeon is onrepparttar 126192 ground? Is it vulnerable to attack by cats?

No. It JERKS ITS HEAD!

From one position it takes a "SNAPSHOT" ofrepparttar 126193 scene. Then it moves its head to a position that is removed by a distance remarkably similar torepparttar 126194 interocular separation ofrepparttar 126195 human eyes.

Fromrepparttar 126196 new position, it takes a new "SNAPSHOT". It "knows" which image isrepparttar 126197 front one, and which isrepparttar 126198 back because its brain not only commandedrepparttar 126199 movement but also received gnosisceptor confirmation.

So it needs only REMEMBERrepparttar 126200 first image for a split-second, long enough to combine it withrepparttar 126201 second image for a "Wheatsone glimpse", and it has perceivedrepparttar 126202 stereoscopic depth of its environment.

Does this only apply to pigeons?

Apparently not. When a human closes one eye,repparttar 126203 limbic system will no longer have two images for stereoscopic evaluation ofrepparttar 126204 environment. It will become dependent uponrepparttar 126205 "TEMPORAL" data inrepparttar 126206 one-eye image. That is, upon howrepparttar 126207 perspective changes over TIME.

I have made some tools for stereoscopists available at http://www.wehner.org/3d/ or http://www.wehner.org ools .

Of interest in this context isrepparttar 126208 LEN.COM lenticular stereogram maker. This creates an image of interleaved stripes for use with lenticular plastic.

However, suppose we makerepparttar 126209 stripes HORIZONTAL instead of vertical. Suppose also, that we make a mask inrepparttar 126210 GIF process where each odd row of pixels is black and each even row transparent. Asrepparttar 126211 mask slides overrepparttar 126212 striped image,repparttar 126213 left-eye and right-eye images will be seen alternately.

Using Internet Explorer,repparttar 126214 trick works quite well. So you can see Professor Wheatstone rocking back and forth if you sliderepparttar 126215 scroll-bar whilst viewingrepparttar 126216 introductory page at http://www.wehner.org/3d/ .

Look closely, and it becomes quite obvious thatrepparttar 126217 tuft of hair torepparttar 126218 left of his head is moving forward and backward in space.

You can seerepparttar 126219 effect EVEN WITH ONE EYE CLOSED.

Remarkable!

Charles Douglas Wehner

Charles Wehner is an electronics engineer and technical author born in 1944. He was involved with radar, nucleonics and measurement-and-control systems - and was for many years a member of the Stereoscopic Society in London, England.


Be Empathetic Not Sympathetic

Written by Steve Davis


Continued from page 1

This stance is one of understanding and one that placesrepparttar responsibility for gettingrepparttar 126187 necessary help inrepparttar 126188 hands ofrepparttar 126189 person who needs it. Donít rescue! Many people playrepparttar 126190 victim role so that others can playrepparttar 126191 rescuer role. Give peoplerepparttar 126192 opportunity to findrepparttar 126193 strength they need and you will both gain.

Practice Empathy

Practice using empathyrepparttar 126194 next time youíre in a situation where someone is suffering emotionally. Assuming this person is an otherwise functional and healthy human being, be present with them in an effort to understand what you might be feeling in a similar situation. Donít try to have their feelings. Instead, trust that they haverepparttar 126195 inner resources necessary to solve their problems and to getrepparttar 126196 help they need to move forward. Let them feel their feelings, express their concerns, and shed their tears. Donít try to fix anything for them. Just be with them with your heart open and with an inner and outer certainty that theirís is just one perception of their current reality and that they will find strength in your silent witness to their temporary fantasy of limitation.

Aboutrepparttar 126197 Author: Steve Davis, M.A., M.S., is an Facilitator's Coach, Infoprenuer, and free-lance human, helping facilitators, organizational leaders, educators, trainers, coaches and consultants present themselves confidently, access their creativity, empower their under-performing groups, enhance their facilitation skills, and build their business online and offline. Subscribe to his free weekly ezine at www.MasterFacilitatorJournal.com.

About the Author: Steve Davis, M.A., M.S., is an Facilitator's Coach, Infoprenuer, and free-lance human, helping facilitators, organizational leaders, educators, trainers, coaches and consultants present themselves confidently, access their creativity, empower their under-performing groups, enhance their facilitation skills, and build their business online and offline. Subscribe to his free weekly ezine at www.MasterFacilitatorJournal.com.


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