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Chapter5Vision - The Major Senses There are 6 major senses...

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1 The Major Senses There are 6 major senses vision hearing touch taste pain smell The list can be extended with balance, joint senses and others Vision has been studied most extensively
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2 Vision Purpose of the visual system transform light energy into an electro- chemical neural response represent characteristics of objects in our environment such as size, color, shape, and location
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3 Light - The Visual Stimulus Gamma rays X-rays Ultra- violet rays Infrared rays Radar Broadcast bands AC circuits Visible light Prism White light 400 500 600 700 10 -5 10 -3 10 -1 10 1 10 3 10 5 10 7 10 9 10 11 10 13 10 15 10 17 Wavelength in nanometers (billionths of a meter)
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4 Light - The Visual Stimulus Light can be described as both a particle and a wave Wavelength of a light is the distance of one complete cycle of the wave Visible light has wavelengths from about 400nm to 700nm Wavelength of light is related to its perceived color
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5 Structure of the Eye The eye works like a camera, using a lens to focus light onto a photo- sensitive surface at the back of a sealed structure. Light rays Cornea Pupil Blind spot Optic nerve Retina Fovea (point of central focus) Lens Iris
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6 Organization of Retina 5 cell types Photoreceptors rods and cones Horizontal Cell Bipolar Cell Amacrine Cell Ganglion Cell
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7 Organization of Retina To optic nerve Ganglion cell Amacrine cell Bipolar cell Horizontal cell Cone Rod Light Light Cross section of retina shown vastly magnified in the diagram to the right Photochemical is located here Back of the eye
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