PSYC 406 Chapter Notes - Chapter 3-4: Retina, Ferrous, Radioactive Tracer
Document Summary
Processing from retina to visual cortex and beyond. Each retinal neuron, besides sending an excited message to the bipolar neurons, Inhibition = surrounding neurons fire less sends inhibiting signals. Limulus polyphemus (horseshoe crab) __ommatidia = receptor has a bunch of lenses in the eye. Ommatidia allow recordings from a single receptor. Light shown into a single receptor leads to rapid firing. B sends inhibition to a. if the intensity is increased on b (light), a will fire less. Three lightness perception phenomena are explained by lateral inhibition. The hermann grid: seeing spots are an intersection. Simultaneous contrast: seeing areas of different brightness due to adjacent areas. People seen an illusion of enhanced lightness and darkness at borders of light and dark areas. Actual physical intensities indicate that this is not in the stimulus itself. Receptors responding to low intensity (dark) area have the smallest output. Receptors responding to high intensity (light) area have the largest output.
