Vision.



  • Physical stimulus is "light".
    • Part of E.M. spectrum--show transparency
    • Varies in amplitude and frequency (wavelength)
    • Visible light, about 400 to 750 nanometers
    • High energy = high frequency = short wavelength
    • quantal (photon) vs wave.
      • Perception Quantal characteristic Wave characteristic
      Color

      (red -> violet)

      		 low energy -> high energy long wavelength ->

      short wavelength

      Brightness

      (dim -> bright)

      		few quanta -> many quanta small amplitude -> large amlitude.



      • Characteristics
        • Intensity
        • contrast
        • color (hue, saturation, brightness).
        • Dynamic range (photopic, scotopic)
        • Detection of form.


          • General layout of visual system. Eye-> optic nerve -> chiasm -> tract -> LGN -> occipital cortex.

 

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Last modified: July 08, 2010