Learning Objectives. How does sensation differ from perception?What are the processes involved in depth perception?Why are we tricked by visual illusions?. Difference between sensation and perception. SensationThe stimulation of the sense receptorsPerceptionThe organization and interpretatio
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
1. Perception and Illusion
2. Learning Objectives How does sensation differ from perception?
What are the processes involved in depth perception?
Why are we tricked by visual illusions?
3. Difference between sensation and perception Sensation
The stimulation of the sense receptors
The organization and interpretation of sensory stimulation
Despite an inverted retinal image, we don’t perceive flipped images
Behavior affected by experience and learning
People’s expectations influence what they see
The whole (perception) is greater than the sum of its parts (sensation)
4. Gestalt Principles of Grouping Proximity
Seeing rows rather than columns
We perceive things that are close to be a single unit
Seeing lines that connect 1 to 2 and 3 to 4 in C
Viewers tend to see elements in ways that produce smooth continuation
5. Gestalt Principles of Grouping
Seeing columns of orange and red dots
Objects sharing features are grouped together
Seeing a horse in D
Viewers tend to supply missing elements to close figure
8. Context Effects
How we see the middle character, depends on whether we examine the rows or the columns
9. Context Effects
How we perceive color is dependent upon nearby colors.
The pinks are the same shade
Op art from the 70s capitalized on this and other perceptual illusions
11. Depth and Distance Perception Binocular cues depend on input from both eyes
Each eye has a slightly different view
decreases with distance
eyes moving closer together as object draws near
12. Depth and Distance Perception Monocular cues depend on input from only one eye
Relative image size (smaller objects are father away)
Pictorial depth cues (linear perspective)
Closer objects will block view of more distant objects
18. Muller-Lyer Illusion
19. Muller-Lyer Illusion
20. Ponzo Illusion The retinal images of the red lines are equal!
Depth cues trick us into perceiving the upper line as more distant
Because of size constancy, an object that is farther away but casts same retinal image must be larger
23. Optical illusions Show how perceptual organization can fool us
We use perceptual hypotheses to organize our sensory experiences
Sometimes, as is the case in optical illusions, our hypotheses our wrong