Vision No.7
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Questions and Answers

Biological motion allows you to not

  • Tell how people walk
  • Recognise people from how they walk
  • Identify the age of people
  • Understand in depth emotion of people (correct)
  • How much energy occurs from the upward and downward cells when staring at a stationary object?

  • Less energy occurs from the upward cells than the downward cells.
  • Equal amounts of energy occur between the upward cells and downward cells. (correct)
  • It depends on the environment the object is in.
  • More energy occurs from the upward cells than the downward cells.
  • Where does directional selectivity occur in the brain?

  • V1 & V5 (correct)
  • V1 & V2
  • V3
  • V4
  • Direction - specific threshold elevation is when we no longer see the object move in the same direction it is moving due staring at it for a long time.

    <p>True</p> Signup and view all the answers

    Why can we not see the wagon wheel move at a very high speed?

    <p>Our brain can only cope with a certain amount of motion per second.</p> Signup and view all the answers

    Induced movement

    <p>Clouds move past the moon making the moon look like it is moving in the opposite direction.</p> Signup and view all the answers

    Why do we gat travel sick?

    <p>There is a mismatch in signals from the brain saying we are moving and the vestibular organ saying we are not moving.</p> Signup and view all the answers

    Random dot kinematogram allows the postural stability system to be isolated.

    <p>False</p> Signup and view all the answers

    Motion blindness

    <p>Unable to perceive the speed of moving objects</p> Signup and view all the answers

    When we look at the Pinna illusion our motion detectors look at the whole image holistically

    <p>False</p> Signup and view all the answers

    Study Notes

    Biological Motion

    • Biological motion refers to the phenomenon where our brain detects motion in stationary objects due to the movement of cells in our retina

    Directional Selectivity

    • Directional selectivity occurs in the brain, specifically in the VI (primary visual cortex)
    • It allows us to detect motion in a specific direction

    Direction-Specific Threshold Elevation

    • Direction-specific threshold elevation occurs when we stare at an object moving in the same direction for a long time, making us less sensitive to its motion
    • As a result, we may no longer perceive the object as moving in that direction

    Wagon Wheel Effect

    • The wagon wheel effect occurs when we view a rotating wheel at high speed, creating the illusion that it is moving in the opposite direction
    • This is due to the limitations of our visual system's ability to process fast motion

    Induced Movement

    • Induced movement is an illusion where a stationary object appears to move due to the movement of another object in the vicinity

    Motion Sickness

    • Motion sickness occurs when there is a conflict between what our body perceives and what our senses detect, often due to a discrepancy between visual and vestibular (balance-related) cues

    Random Dot Kinematogram

    • A random dot kinematogram is a technique used to isolate the postural stability system, which is involved in detecting motion and maintaining balance

    Motion Blindness

    • Motion blindness refers to a condition where individuals have difficulty perceiving motion, often due to abnormalities in the visual cortex

    Pinna Illusion

    • The Pinna illusion is a visual illusion where our motion detectors perceive the whole image holistically, rather than individual components, leading to an illusion of motion

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