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Perception. By: Alyssa Beavers, Chris Gordon, Yelena Pham, Hannah Schulte. To start off…. What is the relationship between sensation and perception? Perception : brings meaning to sensation; interpretation, NOT representation. Perceptual Processing.

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Alyssa Beavers, Chris Gordon,

Yelena Pham, Hannah Schulte

to start off
To start off…
  • What is the relationship between sensation and perception?
  • Perception: brings meaning to sensation; interpretation, NOT representation
perceptual processing
Perceptual Processing
  • Process where sensation becomes perception
  • Feature detector: cells that detect specific stimulus
    • Ex. length, color, boundary
    • Even cells for only human features
    • Binding problem
  • Bottom-Up: perception is driven by stimulus
  • Top-Down: perception is driven by own mind
    • Person may have bias towards something
  • Perceptual Constancies: ability to recognize same object’s qualities under different conditions
    • Color, size, shape
ambiguity and distortion
Ambiguity and Distortion
  • Illusion: incorrect perception of stimulus pattern
    • Ex. Hermann Grid, Muller-Lyer Illusion, dalmation
  • Ambiguous Figure: images with multiple interpretations; meant to perplex interpretations
    • Ex. Necker Cube, vase/faces
  • Artists, architects, interior designers, theatrical productions, clothes
  • Culture, context
theoretical explanations
Theoretical Explanations
  • Gestalt: Nature
    • Organize stimulation for meaningful patterns
    • See as whole rather than sum of parts
  • Learning-based Inference: Nurture
    • Influences on perception
    • Expectations, context, culture, etc.
    • Stroop Effect- demonstration of a reaction time of a task
gestalt theory
Gestalt Theory
  • Figure and Ground: the main object of focus vs. a background
  • Closure: making assumptions to complete an incomplete figure
  • Grouping: preference to grouping stimuli together to have percept
    • Similarity, Proximity, Continuity, Common Fate
the laws
The Laws
  • Law of Similarity: similar objects
  • Law of Proximity: objects near each other
  • Law of Continuity: preference to perceive objects as connected rather than broken
  • Law of Common Fate: share a motion or destination
depth perception
Depth Perception
  • Visual ability to perceive the world in three dimensions and distances of objects
binocular cues
Binocular Cues
  • Provides depth information when viewing a scene with both eyes
    • Retinal Disparity: comes from differences of perspective from each eye
    • Convergence: vision lines from eyes meets at different angles at different distances
monocular cues
Monocular Cues
  • Provides depth information when viewing a scene with one eye
    • Relative size, light and shadow, interposition, relative motion, atmospheric perspective
    • Accommodation: how the eye muscles change to focus on an object depending on distance
    • Linear Perspective (Ponzo Illusion): parallel lines appear to converge to portray depth/distance
demonstration time
Demonstration Time!
  • Depth perception (2012, October 7). Retrieved November 29, 2012, from
  • (n.d.). Retrieved November 29, 2012, from