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Sensation and Perception

Sensation and Perception. The Basics Chapter 4 Section 1. What is Sensation. Stimulation of sensory receptors and the transmission of sensory information to the central nervous system. What we see, taste, feel, smell and hear. What is Perception.

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Sensation and Perception

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  1. Sensation and Perception The Basics Chapter 4 Section 1

  2. What is Sensation • Stimulation of sensory receptors and the transmission of sensory information to the central nervous system. • What we see, taste, feel, smell and hear.

  3. What is Perception • The psychological process through which we interpret sensory stimulation. • Making sense of what we see, taste, feel, smell and hear.

  4. ZOOM ART • As each slide scrolls, write a brief description about each picture.

  5. Think about it! • How did your perception of the picture change as you viewed more and more of it? • Compare your first evaluation and your last evaluation. How different are they?

  6. http://www.exploratorium.edu/exhibits/mona/mona.mpg Brick wall Rutgers

  7. Absolute Thresholds • the weakest amount of stimuli that can be sensed • Examples • the number of hairs on the back of one's hand that must be touched before it can be felt • the faintest sound that a person can hear

  8. Some Examples • Vision – A candle flame viewed from a distance of about 30 miles on a dark night. • Hearing – The ticking of a watch from about 20 feet away in a quiet room. • Taste – About 1 teaspoon of sugar dissolved in 2 gallons of water.

  9. Difference Threshold • the minimum amount of difference between two stimuli • Example • The difference between paint samples • The difference between one increase in volume on a stereo v. two increases

  10. Why is Absolute threshold and difference threshold so important? • So we can detect stimuli without being overwhelmed • So we can differentiate between stimuli

  11. THINK ABOUT IT! • Why is it important to differentiate between stimuli?

  12. Signal detection theory • Method of distinguishing sensory stimuli that takes into account elements such as the setting, your physical state, your mood and attitudes • Examples • Hearing a friend in a crowded room • Having a cold (food will taste different) • Feeling angry or upset (may change your reaction) • Motivation, expectations and learning can all play roles in signal detection

  13. Sensory Adaptation • We become more sensitive to weak stimuli • Example • Eyes adjust to darkness • We become less sensitive to unchanging stimuli • Example • On the beach as time passes we are less aware of the sound of the ocean

  14. Looking Forward • In what ways can a better understanding of how you sense and perceive information add to your understandings of behavior?

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