TB10 P&C Lecture 3; Gain control and normalisation

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  • Created by: mint75
  • Created on: 24-05-16 12:31

1. What is contrast?

  • The amount of light reaching the retina. Expressed as a decimal or percentage
  • The levels of shadow in the visual field. Expressed as a decimal or percentage
  • The luminance variation in the visual field. Expressed as a decimal or percentage
  • The amount of light in the visual field. Expressed as a decimal or percentage
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2. What is the 'dipper' function?

  • Not everything obeys Webers Law. The dip = visual system LEAST sensitive to contrast and steepest part of response curve
  • Not everything obeys Webers Law. The dip = visual system MOST sensitive to contrast and steepest part of response curve
  • Everything obeys Webers Law. The dip = visual system MOST sensitive to contrast and steepest part of response curve
  • Everything obeys Webers Law. The dip = visual system LEAST sensitive to contrast and steepest part of response curve

3. What is the correct process?

  • Cortex -> LGN -> Retina
  • Retina -> LGN -> cortex
  • Retina -> cortex -> LGN
  • Cortex -> Retina -> LGN

4. What is the currency of the early visual system?

  • Contrast
  • Motion
  • Luminance
  • Colour

5. The gain pool for early contrast normalisation...?

  • Does not care about contrast
  • Does not care about spatial frequency or orientation
  • Does not care about luminance or orientation
  • Does not care about luminance

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