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Sensation vs. Perception. sensation: the experience of sensory perception perception: the process of creating meaningful patterns from raw sensory information. Sensory Thresholds.

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Presentation Transcript
sensation vs perception
Sensation vs. Perception
  • sensation: the experience of sensory perception
  • perception: the process of creating meaningful patterns from raw sensory information
sensory thresholds
Sensory Thresholds
  • absolute threshold: minimum stimulation needed to detect a particular stimulus 50% of the time
  • difference threshold (jnd): minimum difference between two stimuli that one can detect 50% of the time

—increases with magnitude of stimulus

weber s law
Weber’s Law
  • The principle that the jnd for any given sense is a constant fraction or proportion of the stimulation being judged.
approximate absolute thresholds
Approximate Absolute Thresholds
  • Vision: a candle flame seen from 30 miles on a clear, dark night
  • Hearing: the tick of a watch from 20 feet in very quiet conditions
  • Smell: 1 drop of perfume diffused throughout a three-room apartment
approximate absolute thresholds5
Approximate Absolute Thresholds
  • Taste: .0356 ounce of table salt in 529 quarts of water
  • Touch: a bee wing falling on your cheek from a height of 1 centimeter
subliminal perception
Subliminal Perception
  • definition: below threshold
  • We can process some information from stimuli too weak to recognize.
  • effect of subliminal stimulation: a subtle, fleeting effect on thinking
does subliminal advertising work
Does subliminal advertising work?
  • No. The goal of using subliminal advertising is to increase the likelihood that you will buy a particular product.
  • Research has repeatedly demonstrated that subliminal advertising cannot change an individual’s behavior.
Receptors: rods and cones

Rods Cones

  • 120 million
  • periphery
  • sensitivity
  • night vision
  • 8 million
  • central
  • acuity
  • color vision
path from eye to visual cortex
Path from Eye to Visual Cortex



ganglion cells

bipolar cells

visual cortex