Psych 104 - Chapter 4

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  1. Synesthesia
    The perceptual experience of one sense that is evoked by another sense.
  2. Percentage of people with synesthesia
  3. Sensation
    Simple awareness due to the stimulation of a sense organ
  4. Perception
    Organization, identification, and interpretation of a sensation in order to form a mental representation
  5. Transduction
    When many sensors in the body convert physical signals from the environment into neural signals sent to the central nervous system
  6. Energy conversion in sensation and perception
    Physical energy from the world to neural energy in the CNS
  7. Operationalize
    To find a reliable way to measure something
  8. What type of psychologist was Wilhelm Wundt?
  9. What type of psychologist was Edward Titchener?
  10. Who used introspection to measure perceptual experiences?
    Wilhelm Wundt and Edward Titchener
  11. Who developed psychophysics?
    Gustav Fechner
  12. Psychophysics
    Methods that measure the strength of a stimulus and the observer's sensitivity to that stimulus
  13. Absolute threshold
    The minimal intensity needed to just barely detect a stimulus
  14. Investigators' definition of absolute threshold
    Intensity of the stimulus at which an observer can detect it on 50% of the trials
  15. Who proposed the just noticeable difference (JND)?
    • Gustav Fechner
    • Just noticeable difference (JND)
    • The minimal change in a stimulus that can just barely be detected
  16. Standard (s) - with regards to JND
    A fixed intensity
  17. What did Ernst Weber notice and in what year?
    The just noticeable difference is roughly proportional to the magnitude of the standard stimulus - 1834
  18. Weber's Law
    The just noticeable difference of a stimulus is a constant proportion despite variations in intensity
  19. Who created Weber's law and who was he influenced by?
    Gustav Fechner created it, influenced by Ernst Weber
  20. Signal detection theory
    The response to a stimulus depends on: 1. A person's sensitivity to the stimulus, and 2. A person's response criterion
  21. Liberal vs. conservative criterion response
    Liberal - tend to say they detect a signal vs. conservative - tend to say they don't detect a signal
  22. Who developed the ideas behind signal detection theory and when?
    Gustav Fechner in 1860 - characteristics of the stimulus and the observer need to be taken into account
  23. Perceptual sensitivity
    How effectively the perceptual system represents sensory events
  24. Sensory adaptation
    Sensitivity to prolonged stimulation tends to decline over time (organism adapts)
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Psych 104 - Chapter 4
2011-10-31 02:05:41
Psych 104 Sensation Perception Chapter

Psych 104 Sensation and Perception - Chapter 4
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