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Visual Perception Chapter 3.

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Presentation on theme: "Visual Perception Chapter 3."— Presentation transcript:

1 Visual Perception Chapter 3

2 Sensation & Perception
Sensation: 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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9 Role of the eye in Visual Perception
View clip on the eye

10 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

11 Perception: Gestalt principles
Gestalt – the way we organise parts into a whole We mentally ‘fill in’ the parts that we can’t see. 1. figure-ground organisation Object is the figure, everything else is background Needs a line or boundary (contour) Contour is part of the object

12 Perception: Gestalt principles
2. Closure tendency to mentally fill in or ignore gaps in the object 3. Similarity Tendency to group similar features together

13 Perception: Depth principles
4. Proximity tendency to perceive parts that are close together as belonging together.

14 Perception: Depth principles
Ability to accurately estimate the distance of an object (can see 3-D) Binocular (requires both eyes) Convergence Retinal disparity

15 Perception: Depth principles
Ability to accurately estimate the distance of an object (can see 3- D) 2. Monocular (requires only one eye) Accommodation Pictorial Cues linear perspective interposition texture gradient relative size height in the visual field

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17 Perception: Perceptual constancies
shape constancy size constancy brightness constancy

18 Explorations http://faculty.washington.edu/chudler/chvision.html
Folio Activity: Stroop Effect

19 Perceptual Set

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