Online Lecture 7 - Vision - Transduction In sensation,...

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1 Vision Why do we see afteriamges? Josh Wede Psych 100 Transduction In sensation, transformation of stimulus energy into neural impulses. Phototransduction: Conversion of light energy into neural impulses that brain can understand. Visible Spectrum The Stimulus Input: Light Energy Both Photos: Thomas Eisner Light Characteristics 1. Wavelength (hue/color) 2. Intensity (brightness) 3. Saturation (purity) Wavelength (Hue) Hue (color): dimension of color determined by wavelength of light. Wavelength the distance from the peak of one wave to the peak of the next. Wavelength (Hue) Different wavelengths of light result in different colors. 400 nm 700 nm Long wavelengths Short wavelengths Violet Indigo Blue Green Yellow Orange Red
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2 Intensity (Brightness) Intensity Amount of energy in a wave determined by amplitude; related to perceived brightness. Intensity (Brightness) Blue color with varying levels of intensity. As intensity increases or decreases, blue color looks more “washed out” or “darkened.” Purity (Saturation) Monochromatic light added to green and red make them less saturated. Saturated
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This note was uploaded on 09/23/2010 for the course IST 220 at Pennsylvania State University, University Park.

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Online Lecture 7 - Vision - Transduction In sensation,...

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