Structure Notes - Perception: Visual Illusion is when your...

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Perception: Visual Illusion is when your perception of something in the world is not the same as what we believe to be in the world CONSEQUENCES OF BEING DEPENDENT ON YOUR SENSES Illusions – ambiguous figures Can’t see things that are there Do see things that aren’t there Past experience and contex (ex. T E C T…H and A are the same yet you know it’s the cat) Individual differences (ex. Color-blindness) Outline Perception brief Can you prove the world exists? Dependent on our senses- better hope their right Why so many mistakes (and differences) Too little information Too much information o The mystery story – retina contains too much AND too little info o Wow factor – help! I’m trapped in my own senses (I’m always seeing the past) Light: When something heated up, electrons mobve and create electromagnetic radiation The eye can sense a specific range (400-700 nm) which is called the visual region When e.m. radiation hits an object the energy must be either absorbed or reflected Some of reflected light goes toward eye If wavelengths are too small they can be dangerous Over 100,000 cells/pixels on retina, but little information b/c a 3-D image is projected onto a 2-D surface At the same time there is too much information Brain must reason by guessing using past experience and context, ect. Though sometimes it reasons incorrectly Perception does not require time. Open eyes and everything is there. Other reasoning that occurs in the brain takes time (i.e. math problem) This reasoning occurs w/out awareness and instantaneously Muller-Lyer Illusion Lines are physically same size but you cannot override visual system even though you know cognitively that they are the same size Perception is too important to be open to mistakes made by cognitition
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TOO LITTLE INFO Object in the world is called a distil image Object in the retinal image is called proximal stimulus A Same size retinal image can be produced by different size objects in the world Humans must determine whether cactus is at pt. A,B, or C Ex: Walking around room, As she walked further, her image got smaller Do you believe that your hand shrinks as you move it closer to your face Same Size object can produce different size retinal image Further image Apparent size of image Nearby image e Apparent size of image After image of retina
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Ambiguous – the same retinal image can be caused by lots of different objects in the world Size constancy – the perception that the size of the object stays the same even though the retinal image size is changing You have cues from surroundings to know the size of the object and the distance Shape constancy – the perception that the shape of the object stays the same even though the retinal image shape is changing Example: Open doors must be drawn as a trapezoid even though in reality it is a rectangle at a slant. This is because perceptual system recognizes that a shape changes appearances even though the actual shape does not change. If two things are the same size on the retina, then the one that is closer will appear to be
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This note was uploaded on 04/03/2008 for the course INDV 101-027 taught by Professor Dr.bedford during the Spring '08 term at University of Arizona- Tucson.

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Structure Notes - Perception: Visual Illusion is when your...

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