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Perception

Sensation, perception and depth cues

  • 3 things to know
  • Paper 1

Overview

The difference between sensation and perception, the monocular cues of height in plane, relative size, occlusion and linear perspective, and retinal disparity, convergence and size constancy.

What you need to know

Answer each one before you reveal it.

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Key term

What is sensation?

Key term

What is perception?

Key term

Explain the difference between sensation and perception, using the example of seeing a friend across the street.

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is sensation?

    Model answer

    Sensation is the detection of physical energy, such as light or sound, by the sense organs. The information is then passed to the brain as nerve impulses.

  2. 2

    What is perception?

    Model answer

    Perception is the process by which the brain organises and interprets sensory information. Interpretation turns raw sensations into meaningful experiences, such as recognising a face.

  3. 3

    Explain the difference between sensation and perception, using the example of seeing a friend across the street.

    Model answer

    Sensation is the eyes detecting the light reflected from the friend. Perception is the brain interpreting that information and recognising the person as your friend.

  4. 4

    What is a depth cue?

    Model answer

    A depth cue is a feature of the visual scene that helps us judge distance. Depth cues allow a flat image on the retina to be seen in three dimensions.

  5. 5

    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.

  6. 6

    What is the depth cue of height in plane?

    Model answer

    Height in plane means objects placed higher in the visual field, nearer the horizon, are seen as further away.

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