Chapter 5 -Page 150

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  • Psychophysics
    • Psychophysics is the systematic study of the relation between the physical characteristics of stimuli and the sensations they produce (the 'physics of the mind')
    • The principle of the just-noticeable difference
      • Ernst Weber (1795-1878), a German anatomist and physiologist, investigated the ability of humans to discriminate between various stimuli
        • He measured the just-noticeable difference (jnd) - the smallest change in the magnitude of a stimulus that a person can detect.
    • Signal detection theory
      • Psychophysical methods rely heavily on the concept of a threshold, the line between not perceiving an d perceiving.
        • The just-noticeable difference can also be called a difference threshold, the minimum detectable difference between two stimuli
    • To study perceptual phenomena, scientists had to find reliable ways to measure people's sensations.
      • Two of these methods are the just-noticeable difference and the procedures of signal detection theory
        • The principle of the just-noticeable difference
          • Ernst Weber (1795-1878), a German anatomist and physiologist, investigated the ability of humans to discriminate between various stimuli
            • He measured the just-noticeable difference (jnd) - the smallest change in the magnitude of a stimulus that a person can detect.
        • Signal detection theory
          • Psychophysical methods rely heavily on the concept of a threshold, the line between not perceiving an d perceiving.
            • The just-noticeable difference can also be called a difference threshold, the minimum detectable difference between two stimuli

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