Global Bioethics may be seen as the ultimate quid pro quo for the Land Ethic called for by Aldo Leopold in 1949• The core of that idea is conveniently expressed in the dedication of my first book on bioethics to Leopold directly quoting him. In the second of four paragraphs h~ had said: There is as yet no ethic dealing with man's relation to land and to the animals and plants which grow upon it...

Binocular rivalry is the alternating percept that can result when the two eyes see different scenes. Recent psychophysical evidence supports the notion that some aspects of binocular rivalry bear functional similarities to other bistable percepts. We build a model based on the hypothesis (Logothetis & Schall, 1989; Leopold & Logothetis, 1996; Logothetis, Leopold & Sheinberg, 1996) that alternat...