TIERRA DEL FUEGO. WEATHER AND CLIMATE. In spite of its incendiary name, Tierra del Fuego -as well as the rest of Patagonia- has low temperatures and strong winds, sudden changes of weather, going from strong winds to complete calm, or from sunny to rainy conditions being very common.
Theories of Color Vision. 1  In 1802, Thomas Young proposed that all human vision occurred through the combination of sensitivity to red, green, and blue. This theory, modified by Hermann von Helmholtz in 1852, came to be known as the Young-Helmholtz or trichromatic (three-color) theory of color vision.
Again, the opponent process theory does NOT REFUTE the trichromatic theory, but builds upon it. There is ONE strong piece of evidence that support the opponent process theory: afterimages. Historically, scientists pitted the trichromatic theory against the opponent process theory, but today, both theories explain our color vision.