Describe how the differences in the size of the receptive fields within the fovea and peripheral retinal eye fields explain how the Hermann grid illusion works
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Describe how the differences in the size of the receptive fields within the fovea and peripheral retinal eye fields explain how the Hermann grid illusion works
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- Explain the normal functioning of the eye to allow us to have visual acuity. What is meant by visual acuity? How does the eye adjust to facilitate this? Specifically, how do changes in near-point accommodation and astigmatism affect acuity? What is the problem with changes in near-point accommodation and astigmatism and why are they problematic? How can each of these be measured? Can these conditions be corrected? If so, how? Do these conditions change as we age?At what location on the retina is visual acuity the best, and what receptor type along with what photoreceptor physical characteristic underlies this best acuity?We discussed three principles with regards to the sensory cortex (mechanisms of perception), with one of them being a hierarchical organization. Using the somatosensory system as an example (specifically the exteroceptive part of that system), state each level of the hierarchy with regards to this system, beginning with the one at the lowest level of the hierarchy to the final uppermost level. give the name at each level as it corresponds with this system.
- Describe the P pathway from retina to higher visual processing areas. What type of visual information is this pathway involved in processing?Describe the location and function of the ventral stream of visualprocessing areas in the cerebral cortex. Then explain why the dorsal and ventral visual streams are called the “where” and “what” streams, respectively.Describe trichromatic theory and opponent-process theory of color vision, including the observations on which it is based and the physiological basis of each theory. Please include references.
- Using a line diagram, show how parallel rays of light are brought to a focus on the retina. Explain how this focus is maintained as the distance from the object to the eye is increasedor decreased (that is, explain accommodation).Provide a step by step list of visual sensation through visual processing. Begin at light entering the eye through signal transduction, to the circuitry involved in the brain in understanding the "what" and "where" of the object. Be sure to review the specific criteria outlined in the rubric.List 4 major destinations of the visual pathway. What is the light used for at each destination?
- Describe the structure of the retina and explain howlight stimulates action potentials in the optic nerves.Starting with the optic nerve, trace the action potential from the right temporal visual field to the visual cortex. What is the possible effect of lesions of the visual pathway?Explain in detail each and every"Rhodopsin-retinal visual cycle in Rods". (Note: Sir please make sure that you explain each step by giving a heading to each step so that I can easily understand it.)
