Lecture 15

Question 1

Motion

Answer 1

Keeps us updated to perceive shapes; determine our direction; perceive other people’s moods

Question 2

Survival in Environment

Answer 2

predators use movement to hunt prey; if prey reduces motion it will less likely be found

Question 3

Akinetopsia

Answer 3

Blindness to motion; problem following dialogue bc cannot see lips moving

Question 4

Attentional capture

Answer 4

Motion attracts attention to the moving object; only works if you’re consciously looking for something or it is occurring in peripheral vision

Question 5

Real motion

Answer 5

An object is quite literally physically moving

Question 6

Illusory motion

Answer 6

Stimuli is not moving but motion is perceived

Question 7

Apparent motion (type of illusory motion)

Answer 7

Stationary stimuli are presented in slightly different locations; basis of movement for movies and tv shows

Question 8

Induced motion (type of illusory motion)

Answer 8

Movement of one object results in the perception of movement in another object; ex - stationary moon and moving clouds

Question 9

Motion aftereffect (type of illusory motion)

Answer 9

• observer looks at movement of one y for 20-60 sec
  -look at stationary object
• movement occurs in the opposite direction of og movement

Question 10

Real and Apparent Motion

Answer 10

Perception of motion is related to the same brain mechanisms

Question 11

Object moving and observer is stationary

Answer 11

image moves across retina stimulating receptors one after another causing us to perceive motion

Question 12

Object moving and observer follows

Answer 12

image is stationary of retina bc of tracking movement

Question 13

Observer moves through stationary environment

Answer 13

Image of environment moves across retina but environment is still perceived as stationary

Question 14

Optic array

Answer 14

Structure created by surfaces, textures, and contours which change as the observer moves through the environment

Question 15

Global optic flow

Answer 15

Overall movement of optic array, indicates that observer is moving and not the environment

Question 16

Reichardt detectors

Answer 16

Neurons that fire to movement in one direction

Question 17

Corollary discharge theory

Answer 17

Movement perception depends on three signals

Question 18

Image displacement signal (IDS)

Answer 18

Occurs when an image is moving across receptor in retina

Question 19

Motor signal (MS)

Answer 19

signals sent from brain to eye muscles

Question 20

Corollary discharge signal (CDS)

Answer 20

copy of the motor signal but is sent to different area of brain

Question 21

Movement perceived when comparator receives input from:

Answer 21

-corollary discharge signal
-image displacement signal

Question 22

Movement not perceived when comparator receives signal from

Answer 22

Both CDS and IDS at the same time

Question 23

Real-movement neuron

Answer 23

Only responds when stimulus moves, doesn’t respond when the eye moves, thus it must be receiving CDS