BIOL 121 Lecture 7: Biol 121 - LTR 7
Document Summary
Vision is the process by which our brain translates the light reflected from the objects around us into an image. It involves about half of our cerebral cortex. Light is electromagnetic and emitted in the form of waves. There are several sources and types of light: from the very high energy gamma radiation to the lower energy radio waves. All electromagnetic radiation has defined amplitude, frequency and wavelength. The range of all possible electromagnetic frequencies forms he electromagnetic spectrum. Our eyes are sensitive to a small part of this spectrum called the "visible range" (400- Hemifield: left + right, one half of the visual field usually divided vertically through the fovea into the left or right visual field. Binocular field: region seen by both eyes. Monocular field: region seen by one eye. Lateral geniculate nucleus: lots of axons. Superior colliculus - tectum - midbrain: movement, coordination. Pretectum - edginer-westphal nucleus: controls pupil construction and size.
