Chapter 8- Visual Motion Perception Flashcards Preview

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Flashcards in Chapter 8- Visual Motion Perception Deck (18)
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1
Q

Motion aftereffect (MAE)

A

The illusion of motion of a stationary object that occurs after prolonged exposure to a moving object

2
Q

A Reichhardt Detector

A

Motion detector circuit in the previous slide forms the basis of motion perception in all known biological visual systems—only works with small areas

3
Q

Apparent motion

A

The illusory impression of smooth motion resulting from the rapid alternation of objects that appear in different locations in rapid succession

  • -motion detector circuit does not need real motion in order to fire
  • example computer screen
4
Q

Correspondence problem (motion)

A

the problem faced by the motion detection system of knowing which feature in frame 2 corresponds to a particular feature in frame 1

5
Q

The aperture problem

A

the fact that when a moving object is viewed through an aperture ( or a receptive field the direction of motion of local feature or part of the object may be ambiguous (barbe pole/shapes opposite direction, but really same direction)

6
Q

Middle temporal area (MT)

A

and area of the brain thought to be important in percepting motion

7
Q

The Newsome and Pare paradigm

A

Monkey impairment of correlated motion direction

8
Q

Interocular Transfer

A

The transfer of an effect (such as adaptation) from one eye to another

9
Q

Akinetopsia

A

A rare neurophysiological disorder in which the affected individual has no perception of motion
–caused by disruption to cortical area MT

10
Q

Focus of expansion (FOE)

A

The point in the center of the horizon from which when we are in motion all points in the perspective image seem to emanate.

11
Q

Biological motion

A

-the pattern of movement of all animals

12
Q

Time to Collision(TTC)

A

The time required for a moving object (such as a cricket ball to hit a stationary object such as a batsman’s head) TTC+ distance/rate

13
Q

Smooth Pursuit

A
  • Voluntary eye movement in which the eyes move smoothly to follow a moving object.
14
Q

Saccade

A

A type of eye movement, made both voluntarily and involuntarily, in which the eyes rapidly change fixation from one object or location to another

15
Q

How many muscles are attached to the eye? and how are they arranged?

A

Six muscles

-arranged in 3 pairs

16
Q

Superior colliculus

A

a structure in the midbrain that is important in initiating and guiding eye movements
-when this structure is electrically stimulated eye movements result

17
Q

Saccadic Suppression

A

The reduction of visual sensitivity that occurs when we make saccadic eye movements

18
Q

Comparator

A

An area of the visual system that receives one copy of the order issued by the motor system when the eyes move (the other copy goes to the eye muscles