PHSL 3061 Lecture 2: Topic 4 - Sensory Systems (Zahs) for Course Packet
Document Summary
Reading assignment: vander"s human physiology, 15th edition, pages. 189-200, 205-216: introduction, vision is an active process. We are so familiar with seeing, that it takes a leap of the imagination to realize that there are problems to be solved. We are given tiny distorted upside down images in the eyes, and we see separate solid objects in surrounding space. From the patterns of stimulation on the retina we perceive the world of objects and this is nothing short of a miracle. : anatomy. Visual information is initially processed in the retina: anatomy. Adapted from vander"s human physiology, 15th edition, fig. 7. 27: phototransduction -- process by which light is transformed into the electrical and chemical signals used by the brain, two classes of photoreceptors. Cones: photoreceptors have graded potentials (do not fire action potentials, photoreceptors hyperpolarize in response to light! http://retina. umh. es/webvision/evolution. %20part%2. 0i. html: neural processing in the retina, photoreceptors synapse onto bipolar cells, 2 types of bipolar cells.
