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Chapter 6 - Chapter 6 Vision Receptor Potential a local...

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Chapter 6: Vision Receptor Potential: a local depolarization or hyperpolarization of a membrane (HYPERPOLARIZE in response to light) Law of Specific Nerve Energies: Any activity by a particular nerve always conveys the same kind of information to the brain. (Olfactory-smell, Auditory- hearing, Optic- vision) Mechanical pressure applied to the eye is perceived as light, neurons are excited. Eye and Brain Interaction Pupil: opening in the center of the iris allowing light to enter Lens and Cornea: focus the light Retina: the rear surface of the eye lined with visual receptors (transduction- light waves into brain activity) o Light from the right half of the world strikes the left half of the retina and vice versa Binocular Overlap: central area of vision where both eyes sight overlaps; depth vision Retina Receptors on the back of the eye send their message (Hyperpolarization) to bipolar cells, neurons in the center of the eye (Receptor Potential) Bipolar cells send their message (Depolarization) to the ganglion cells located still closer to the center of the eye Ganglion cells axons join one another, loop around, and travel back to the brain (Hyperpolarization) Optic nerve: formed by banded ganglion cells axons which exit through the back of the eye
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Fovea: a tiny area on in the center of the retina specialized for acute, detailed vision o Each cone in the fovea has a direct line to the brain Two types of receptors Rods: abundant in the periphery of the human retina, respond to faint light; many receptors converge to one bipolar cell
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