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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.

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Sensation vs. Perception

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

  2. 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

  3. Weber’s Law • The principle that the jnd for any given sense is a constant fraction or proportion of the stimulation being judged.

  4. 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

  5. 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

  6. 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

  7. 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.

  8. Stimulus for Vision

  9. The visible spectrum consists of: wavelength amplitude

  10. Cross Section of the Eye

  11. Receptors: rods and cones Rods Cones • 120 million • periphery • sensitivity • night vision • 8 million • central • acuity • color vision

  12. Anatomical Pathway in the Retina

  13. Path to Occipital Lobe

  14. Path from Eye to Visual Cortex light photo-receptors ganglion cells bipolar cells visual cortex LGN

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