Visual Perception
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Transcript of Visual Perception
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Visual PerceptionChapter 3
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Sensation & PerceptionSensation: Occurs when our sensors (internal & external) detect & respond to information.
Perception: assigning meaning to the information that we sense. This occurs in the brain and is a personal interpretation.
When you view the next 3 images, your eyes will gather information, then you brain will select certain parts of that information, organise the parts and finally interpret and evaluate them.
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Role of the eye in Visual Perception
View clip on the eye
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Reception, Transduction, Transmission
Reception: photoreceptors (rods & cones) in the retina detect light stimulus
Transduction: Light energy (EM) is converted into electrochemical energy
Transmission: Electrical message is sent to the visual cortex in the brain via the optic nerve.
AT 2: From Light To Lobe
Movie clip: Sensation & perception
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Perception: Gestalt principles
Gestalt – the way we organise parts into a wholeWe mentally ‘fill in’ the parts that we can’t see.
1. figure-ground organisation Object is the figure, everything else is backgroundNeeds a line or boundary (contour)Contour is part of the object
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2. Closuretendency to mentally fill in or
ignore gaps in the object
3. SimilarityTendency to group similar
features together
Perception: Gestalt principles
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4. Proximity tendency to perceive parts that are close
together as belonging together.
Perception:Depth principles
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Perception:Depth principles
Ability to accurately estimate the distance of an object (can see 3-D)
1. Binocular (requires both eyes) Convergence Retinal disparity
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Perception:Depth principles
Ability to accurately estimate the distance of an object (can see 3-D)
2. Monocular (requires only one eye)AccommodationPictorial Cues
linear perspective interposition texture gradient relative size height in the visual field
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Perception:Perceptual constancies
3. Perceptual Constanciesshape constancysize constancy brightness constancy
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Explorationshttp://faculty.washington.edu/chudler/chvision.htmlhttp
://academics.tjhsst.edu/psych/oldPsych/perception/
Folio Activity: Stroop Effecthttp://faculty.washington.edu/chudler/words.html
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Perceptual Set