visual

Visual Perception Disorders

Damage to the parts of the brain that process visual information can l

ead to a variety of visual

agnosias, depending on which area is damaged. Some people with agnosia have difficulty

recognizing familiar faces or objects, others cannot distinguish color, and still others may not

perceive movement. A related phenomenon is ne

glect, which results in inattention to one side of

the body (and visual field), so that objects on that side are not noticed. There are many

interesting case histories of such individuals, and studying both the site of damage and the

particular loss of fun

ction can tell us a great deal about how the brain allows us to "see" the

world. Such disorders also illustrate the principle that visual perception is somewhat modular,

meaning that particular aspects of objects are processed by different brain areas.

To

prepare for this Discussion:

·

Review the information on vision in Chapter 10, particularly the discussion on disorders

of visual perception.

·

Select one of the disorders covered in the book (object agnosia, prosopagnosia, color

agnosia, movement agnosia, o

r neglect) to research in more detail. Locate a research

report or other scientific article about this disorder in the Walden Library.

·

For the disorder you selected, think about the symptoms and problems commonly

experienced by people with the disorder an

d the impact of the disorder on areas of life

including work, relationships, and leisure time. Also note the areas of the brain

responsible for the disorder and specific behaviors the disorder affects.

With these thoughts in mind:

Post by Day 4

a summary

of the symptoms of the disorder you chose. Include the brain area(s)

responsible for the disorder, and common problems that people with such damage have. Explain

what everyday life would be like for an individual with the disorder, including its impact on

occupation, relationships, and leisure time. Be sure to include how the disorder might affect the

person's behaviors and experiences in these settings.

T

hi

s is some web sites

Visual Projections to the Cortex (

Brain and Behavior,

Figure 10.4)

http://www.sagepub.com/garrettbb2study/animations/10.4.htm

This sequence traces the route by which the eyes send information to the brain.

Visual Detection of Edges (

Brain and Behavior,

Figure 10.20)

http://www.sagepub.com/garrettbb2study/animations/10.20.htm

This sequence demonstrates how on

-

center/off

-

surround retinal ganglion cells respond to edges

and how thes

e responses affect simple cells in the primary visual cortex.

Visual Perception Disorders

Damage to the parts of the brain that process visual information can lead to a variety of visual

agnosias, depending on which area is damaged. Some people with agnosia have difficulty

recognizing familiar faces or objects, others cannot distinguish color, and still others may not

perceive movement. A related phenomenon is neglect, which results in inattention to one side of

the body (and visual field), so that objects on that side are not noticed. There are many

interesting case histories of such individuals, and studying both the site of damage and the

particular loss of function can tell us a great deal about how the brain allows us to "see" the

world. Such disorders also illustrate the principle that visual perception is somewhat modular,

meaning that particular aspects of objects are processed by different brain areas.

To prepare for this Discussion:

 Review the information on vision in Chapter 10, particularly the discussion on disorders

of visual perception.

 Select one of the disorders covered in the book (object agnosia, prosopagnosia, color

agnosia, movement agnosia, or neglect) to research in more detail. Locate a research

report or other scientific article about this disorder in the Walden Library.

 For the disorder you selected, think about the symptoms and problems commonly

experienced by people with the disorder and the impact of the disorder on areas of life

including work, relationships, and leisure time. Also note the areas of the brain

responsible for the disorder and specific behaviors the disorder affects.

With these thoughts in mind:

Post by Day 4 a summary of the symptoms of the disorder you chose. Include the brain area(s)

responsible for the disorder, and common problems that people with such damage have. Explain

what everyday life would be like for an individual with the disorder, including its impact on

occupation, relationships, and leisure time. Be sure to include how the disorder might affect the

person's behaviors and experiences in these settings.

This is some web sites

Visual Projections to the Cortex (Brain and Behavior, Figure 10.4)

http://www.sagepub.com/garrettbb2study/animations/10.4.htm

This sequence traces the route by which the eyes send information to the brain.

Visual Detection of Edges (Brain and Behavior, Figure 10.20)

http://www.sagepub.com/garrettbb2study/animations/10.20.htm

This sequence demonstrates how on-center/off-surround retinal ganglion cells respond to edges

and how these responses affect simple cells in the primary visual cortex.