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Sensation & Perception

Sensation & Perception. Unit III: How do you see the world?. 10/24/2011 Bellringer. How loud do you listen to your music? Does it bother you when people around you listen to extremely loud music? Why or why not? (Minimum 3 Sentences). Article Analysis.

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Sensation & Perception

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  1. Sensation & Perception Unit III: How do you see the world?

  2. 10/24/2011 Bellringer • How loud do you listen to your music? Does it bother you when people around you listen to extremely loud music? Why or why not? (Minimum 3 Sentences)

  3. Article Analysis • You are to read the article and complete the following: • In 20 words or less give a summary of the main point of the article. • What evidence listed in the article supports this main point? (minimum 3 pieces of evidence) • Do you think there should be laws limiting the level of volume you can listen to music in public? (Minimum 6 sentences)

  4. Article Analysis • Despite arguments to the contrary, circumstantial evidence points to increased use of music players contributing the rise in hearing loss. • Evidence • American Medical Association Study – Hearing loss in teens up 30% from the 1980’s & 1990’s. • “One problem is that adolescents don’t report well whether the music they’re listen to is loud” (Dr. Josef Shargorodsky, 2011). • An “increase in the use of personal audio devices” that have longer battery lives and enable longer listening periods to loud music (Dr. Paul Kileny).

  5. Article Analysis • TURN IN BOTH THE ARTICLE AND YOUR WORK AT THE END OF THE PERIOD.

  6. Bellringer For 10/26/2011 • What is sensation? List 5 examples. • What is perception?

  7. Sensation • Sensation – The stimulation of sensory receptors by stimuli and the transmission of sensory information to the central nervous system (CNS). • Sensory receptors are located in the sensory organs. • Ex. Eyes & Ears • The stimulation of the senses is automatic.

  8. Sensation – Sight

  9. Sensation - Sound

  10. Sensation - Smell

  11. Sensation - Taste

  12. Sensation - Touch

  13. What if we could sense everything? • It would “overload” our brain with too much information. • We only “take in” or interpret a small percentage of what we sense.

  14. 10/27/2011 Bellringer • Name 3 areas where sensory receptors may be located.

  15. Perception • Perception – The process through which we organize & interpret sensory stimulation. • Allows us recognize meaningful objects & events. • Perception reflects learning, expectations, & attitudes. • Involves our experiences.

  16. Bellringer For 10/31/2011 • What is the difference between pre-attentive & attentive processing?

  17. Perception • Two Types: • Pre-attentive Processing – Method of automatically gathering information from the environment. • Attentive Processing – Not automatic. Focuses on the most important information in the environment.

  18. Perception • For this upcoming activity DO NOT read the words. Say the color they are printed in as fast as you can.

  19. Perception • Stroop Effect – Pre-attentive processes act as an interference. • Stroop Test – Involves labeling color’s names (ex. Blue, green, red) as different than the color of the text (ex. The word “blue” is colored red). • The pre-attentive processes slow reaction time down.

  20. Four Concepts That Affect Sensation & Perception • Absolute Threshold • Difference Threshold • Signal-Detection Theory • Sensory Adaptation

  21. 1. Absolute Threshold • The weakest amount of a stimulus that can be sensed. • Ex. Beeps for a hearing test • Dog’s sense of smell vs. Human’s sense of smell • Owl’s vision vs. Human’s vision • Absolute threshold can differ from person to person. • Differences result from psychological & biological factors

  22. 1. Absolute Threshold

  23. 1. Absolute Threshold • Absolute Thresholds For Humans • 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 • Smell – About one drop of perfume diffused throughout a small house. • Taste – About 1 teaspoon of sugar dissolved in 2 gallons of water • Touch – The wing of a fly falling on a cheek from a distance of about .4 inch

  24. 2. Difference Threshold • The minimum amount of difference that can be detected between two stimuli. • People’s individual difference thresholds vary slightly. • Is the car midnight blue or black?

  25. 2. Difference Threshold

  26. 3. Signal-Detection Theory • A method of distinguishing sensory stimuli that takes into account both their strengths and the following: • The setting • Your physical state • Your mood • Your attitudes • Focus on what we consider important. • Ex. Friend in a noisy cafeteria or at a party.

  27. 3. Signal-Detection Theory

  28. 4. Sensory Adaptation • The process of becoming more sensitive to weak stimuli & less sensitive to unchanging stimuli. • Movie Theater • Noise in the city vs. the country • Your bedroom

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