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Vision No.7

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10 Questions

Biological motion allows you to not

Understand in depth emotion of people

How much energy occurs from the upward and downward cells when staring at a stationary object?

Equal amounts of energy occur between the upward cells and downward cells.

Where does directional selectivity occur in the brain?

V1 & V5

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.


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

Our brain can only cope with a certain amount of motion per second.

Induced movement

Clouds move past the moon making the moon look like it is moving in the opposite direction.

Why do we gat travel sick?

There is a mismatch in signals from the brain saying we are moving and the vestibular organ saying we are not moving.

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


Motion blindness

Unable to perceive the speed of moving objects

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


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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