Visual Perception
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Transcript of Visual Perception
Visual PerceptionChapter 3
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.
Role of the eye in Visual Perception
View clip on the eye
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
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
2. Closuretendency to mentally fill in or
ignore gaps in the object
3. SimilarityTendency to group similar
features together
Perception: Gestalt principles
4. Proximity tendency to perceive parts that are close
together as belonging together.
Perception:Depth principles
Perception:Depth principles
Ability to accurately estimate the distance of an object (can see 3-D)
1. Binocular (requires both eyes) Convergence Retinal disparity
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
Perception:Perceptual constancies
3. Perceptual Constanciesshape constancysize constancy brightness constancy
Explorationshttp://faculty.washington.edu/chudler/chvision.htmlhttp
://academics.tjhsst.edu/psych/oldPsych/perception/
Folio Activity: Stroop Effecthttp://faculty.washington.edu/chudler/words.html
Perceptual Set