Vision PSYC 1000
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Popular in Psychology (PSYC)
This 2 page Class Notes was uploaded by Cydney Tinsley on Tuesday October 4, 2016. The Class Notes belongs to PSYC 1000 at University of Colorado Denver taught by Alex Northcutt in Fall 2016. Since its upload, it has received 23 views. For similar materials see Introduction to Psychology in Psychology (PSYC) at University of Colorado Denver.
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Date Created: 10/04/16
Cydney Tinsley Psychology Sensation and Perception Sensation and Perception 1. Absolute Threshold: Lowest stimulus needed to detect a difference (at least 50% of the time). 2. Just Noticeable Difference: The smallest change in an existing stimulus needed to detect a difference. 3. Webber’s Law: Based on starting stimulus. Determines how much change is needed before you notice a difference. It’s a ratio. The stronger the starting stimulus, the bigger the change needs to be. 4. Signal Detection Theory: Signal-to-noise ratio. The theory that says it’s easier to pay attention to a signal when it’s quieter. 5. Selective Attention: Your ability to choose which stimulus you want to pay attention to/focus on. 6. Filter Theory: The theory that says that we are constantly taking in everything, but choose which stimuli to pay attention to through Selective Attention. 7. Cocktail Party Effect: The idea that if your brain thinks a different stimulus is more important, it can switch your focus without your meaning to. Supports Filter Theory. 8. Inattentional Blindness: When you don’t notice something that changes because you’re not looking for it/paying attention to it. 9. Change Blindness: When you’re blind to changes in your environment because they aren’t important to you. Vision 1. When it comes to color, we care about: a. Hue: What color is it? b. Saturation: How pure is it? c. Lightness: How much light is there? 2. Parts of the Eye: a. Cornea: Outer layer of the eye, whose job it is to focus/direct light. Rigid and doesn’t change shape easily. b. Pupil: Hole in iris that lets light in and determines how much light to let in. c. Iris: Color part of your eye. A muscle. Determines how much light gets in through the pupil. d. Lens: Focuses light into retina. Flexible and can change easily (adaptation). Overtime, your lens can lose its adaptability and can’t adjust as easily. e. Retina: Back of eye. Layer of light-sensitive cells (responds to light) Point of transduction (when your stimulus gets turned into a signal for your brain) for vision. f. Fovea: Point of central focus. High density of cones (color vision). Responsible for ‘day vision’. g. Blind Spot: Place where vision is inexistent due to blocking by the optic nerve. h. Rods: Black and white vision. Low resolution vision but really good at detecting movement. Cydney Tinsley Psychology Sensation and Perception i. Cones: Color vision. High resolution. Not as good at detecting movement. Issues with Cornea: 1. Myopia (Near-Sighted): When cornea curves more than it should. 2. Hyperopia (Far-Sighted): When the cornea is flatter than it should be. Theories of Color Vision 1. Trichromatic Theory of Color Vision: Theory that there are three different cones that detect different colors. Issue: Can’t explain some phenomenon. 2. Opponent Process Theory: Theory that says there are multiple different colored cones and determines which cones to turn on and off and by how much. Explains after-images. Disproves tricolor theory.
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