Lecture 27

Question 1

Define:

Binocular rivalry

Answer 1

Phenomenon in which a visual perception alternates between the different images presented to the eyes

Question 2

Define:

Stereopsis

Answer 2

Disparity of images from the two eyes allow the estimation of depth

Question 3

What information does stereopsis use?

Answer 3

Relative visual information

Question 4

How is depth determined?

Answer 4

Based on distance between two objects

Question 5

What is Weber’s Law?

Answer 5

The variability in response increases with stimulus magnitude

Question 6

True or False:

Motor/action system is based on estimations

Answer 6

False, motor/action system is absolute

Question 7

Where is depth estimation found?

Answer 7

Depth perception

Question 8

Define:

Enucleated

Answer 8

• Individuals who lost vision in one eye, sometimes both eyes, caused by injury or cancer

Question 9

True or False:

In enucleated patients, they lack stereopsis

Answer 9

True

Question 10

What do enucleated patients have to learn? Describe it

Answer 10

Motion parallax
* Move head around rapidly to determine depth

Question 11

How is eye dominance determined?

Answer 11

By using the look through finger hole test

Question 12

What frame of reference is used in vision for perception?

Answer 12

Relative, allocentric frame of reference

Question 13

In vision for perception:

1. Preciseness
2. What is it used for
3. What stream/pathway

Answer 13

1. This information is not precise, it is relative
2. Identify, determine size, shape or properties of object
3. Ventral stream

Question 14

What frame of reference is used in vision for action?

Answer 14

Metrically precise, egocentric frame of reference

Question 15

In vision for action:

1. Preciseness
2. What it is used for
3. Stream/pathway

Answer 15

1. This information is metrically precise/absolute
2. Reach or point to an area in space to control action
3. Dorsal stream

Question 16

Define:

Prosopagnosia

Answer 16

The inability to identify people by faces

Question 17

Is prosopagnosia congenital or acquired?

Answer 17

Both

Question 18

In acquired prosopagnosia, what is damaged?

Answer 18

A part of ventral visual pathway called the fusiform face region

Question 19

What results from damage to the fusiform face region?

Answer 19

Visual perception process affected

Question 20

What is the fusiform face region used for?

Answer 20

Important for the perceptual processing of a human face (nose, eyes, ears, and mouth)

Question 21

Define:

Visual agnosia

Answer 21

Cannot identify different shapes or object features

Question 22

In object agnosia, what is a trademark feature?

Answer 22

Patient cannot use vision to perceive an object, but can use vision to act on an object

Question 23

In a patient with object agnosia, what area is damaged? What does this lead to?

Answer 23

Inferotemporal lobe (visual stream), bilateral occipital cortex lesions
* Seat for visual perception of an object