Visual Processing – Vision (PSY, BIO)

by Tarry Ahuja, MD

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    We’re going to get into now that the light has come in, it’s being detected by the eyes and it’s going to the brain. We need to somehow process that information. And this is in itself a fairly complicated and robust thing to understand. So you’re going to have to probably spend some time looking at this figure that you see here and familiarize yourself with the structures and the way light goes in. So a couple of key things to realize, you know we have binocular visions. Two eyes, okay? So each eye actually detects a bit from both visual fields. So we can have two visual fields. So imagine this. If you were to take the world and you were to cut it in half, you would have your left visual field and your right visual field. Now within each visual field, you’ll have two more hemispheres. Okay? And information from both sides of the world go into both eyes bilaterally. Okay? So that’s a lot of crisscrossing happening. So we’ll walk through a couple of examples and it will start to make sense. Once it enters the eye, it crosses yet again. And it is processed by the opposing side of the brain. And that’s done in the primary visual cortex which is found in the occipital lobe. Okay? So the right and left visual fields are processes -- are processed contralaterally in the visual cortex. What we’re saying is what you see in the right visual field is processed by the left and vice versa. Nerves cross at the optic chiasm. So if you look at this diagram, it’s where the tracks are coming in passed the eye and that you see them crossing before they enter the actual lobe of the brain. That is called...

    About the Lecture

    The lecture Visual Processing – Vision (PSY, BIO) by Tarry Ahuja, MD is from the course Sensing the Environment.

    Included Quiz Questions

    1. Total blindness of one eye
    2. Temporal Hemianopia
    3. Hemianopia with Macular Sparing
    4. Contralateral Hemianopia
    5. Quadrantopia
    1. Optic nerve, optic chiasm, optic tract, lateral geniculate body, optic radiation, visual cortex
    2. Optic tract, optic chiasm, lateral geniculate body, visual cortex
    3. Optic nerve, Optic tract, Optic radiation, Visual Cortex
    4. Optic nerve, parvocellular cells, optic radiation, visual cortex
    5. Optic nerve, optic tract, optic chiasm, lateral geniculate body, visual cortex
    1. Involves highly myelinated nerves
    2. Involved in color vision
    3. Involved in detection of shape
    4. Located in the lateral geniculate body
    5. Involved in spatial resolution
    1. Uses the frontal lobe
    2. Uses parallel processing
    3. Uses 30% of the cortex
    4. Uses the occipital lobe
    5. Creates a holistic image

    Author of lecture Visual Processing – Vision (PSY, BIO)

     Tarry Ahuja, MD

    Tarry Ahuja, MD

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