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Perception

Depth cues, visual illusions and constancies

  • 3 things to know
  • Paper 2

Overview

Sensation and perception, monocular and binocular depth cues, fictions, ambiguous figures and distortions, and size, shape and colour constancy.

What you need to know

Answer each one before you reveal it.

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Key term

What is the difference between sensation and perception?

Key term

Why does the brain need depth cues?

Key term

What is the difference between monocular and binocular depth cues?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is the difference between sensation and perception?

    Model answer

    Sensation is the detection of stimuli by the sense organs, such as light reaching the eye. Perception is the brain's interpretation of that sensory information.

  2. 2

    Why does the brain need depth cues?

    Model answer

    The image on the retina is flat and two-dimensional. Depth cues let the brain work out a three-dimensional world from that flat image.

  3. 3

    What is the difference between monocular and binocular depth cues?

    Model answer

    Monocular depth cues can be used with only one eye. Binocular depth cues need both eyes working together.

  4. 4

    What is superimposition as a depth cue?

    Model answer

    Superimposition occurs when one object partly hides another. The object doing the covering is seen as closer.

  5. 5

    How does relative size act as a depth cue?

    Model answer

    When two objects are known to be a similar size, the smaller-looking one is seen as further away. A row of identical trees seems to shrink into the distance.

  6. 6

    What is linear perspective?

    Model answer

    Linear perspective is the way parallel lines appear to converge as they stretch into the distance. Railway tracks seem to meet at the horizon, which signals depth.

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