Textbook Notes (378,543)
CA (167,161)
UTSC (19,215)
Psychology (9,984)
PSYB51H3 (315)
Chapter 8

Chapter 8

2 Pages
71 Views

Department
Psychology
Course Code
PSYB51H3
Professor
Matthias Niemeier

This preview shows half of the first page. Sign up to view the full 2 pages of the document.
Chapter 8: Attention and Scene Perception
Attention: name we give to family of mechanisms that restrict processing in various ways
onot a single thing, does not have single locus in nervous system
oOvert attention: directing sense organ at stimulus-i.e. f ixating eyes on single word
oCovert attention: f ixating eyes at this page while directing attention to person of interest off to
left
oDivided attention: reading text while continuing to be aware of music playing in room
oSustained attention: watching the pot to note movement the water begins to boil
Selective attention: ability to pick one (or few) out of m any stimuli
Selection in Space
Posner- subject in experiment fixates on central point
oAfter variable delay, test probe appears in one of 2 boxes
oSubject needs to hit response key as fast as possible when probe appears
oMeasuring reaction time (RT): amount of time that elapses between t he point when probe
appears and point when subject hits response key
Disorders of Visual Attention
Visual-f ield defect: por tion of visual field with no vision or with abnormal vision, typically resulting
from damage to visual nervous system
Lose primary visual cor tex in r ight hemisphere, person will be blind on opposite (left) side of visual
space
If lesion in right parietal lobe, problems direct ing attention to objects and places on their left
Neglect
Patients behave as if part of world were not there
Asked to describe what he sees, patient experiencing neglect of left visual field will name objects to
right of fixation and ignore objects on left
Line cancellation test- patient given paper full of lines and asked to draw intersec ting line through each
one
oNeglect patient may draw lines on one side of paper only
Contralesional field: visual f ield on side opposite brain lesion
Extinction
Neglect- patient may be entirely unable to deploy attention to contralesional side of world or object
Extinction- patient may be able to get attention to object in contralesional field if it is the only salient
object
Ipsilesional field- same side as lesion
oIf there is competition from another similar object in that f ield, then 2 objects compete for
attention and ipsilesional object wins
Balint Syndrome
Bilateral lesions of parietal lobes
3 major symptoms:
oSpatial localization abilities are greatly reduced
Result, patient w ith Balint syndrome may have very hard time try to reach to an object
oPatients with Balint syndrome dont move their eyes every much
Tend to gaze fixedly ahead
oBehave as if they can see only one object at a time
Seems like extreme for m of extinction or neglect, in attending to one object eliminates
everything else
Simultagnosia: inability to perceive more than one thing at a time
www.notesolution.com

Loved by over 2.2 million students

Over 90% improved by at least one letter grade.

Leah — University of Toronto

OneClass has been such a huge help in my studies at UofT especially since I am a transfer student. OneClass is the study buddy I never had before and definitely gives me the extra push to get from a B to an A!

Leah — University of Toronto
Saarim — University of Michigan

Balancing social life With academics can be difficult, that is why I'm so glad that OneClass is out there where I can find the top notes for all of my classes. Now I can be the all-star student I want to be.

Saarim — University of Michigan
Jenna — University of Wisconsin

As a college student living on a college budget, I love how easy it is to earn gift cards just by submitting my notes.

Jenna — University of Wisconsin
Anne — University of California

OneClass has allowed me to catch up with my most difficult course! #lifesaver

Anne — University of California
Description
Chapter 8: Attention and Scene Perception Attention: name we give to family of mechanisms that restrict processing in various ways o not a single thing, does not have single locus in nervous system o Overt attention: directing sense organ at stimulus-i.e. fixating eyes on single word o Covert attention: fixating eyes at this page while directing attention to person of interest off to left o Divided attention: reading text while continuing to be aware of music playing in room o Sustained attention: watching the pot to note movement the water begins to boil Selective attention: ability to pick one (or few) out of many stimuli Selection in Space Posner- subject in experiment fixates on central point o After variable delay, test probe appears in one of 2 boxes o Subject needs to hit response key as fast as possible when probe appears o Measuring reaction time (RT): amount of time that elapses between the point when probe appears and point when subject hits response key Disorders of Visual Attention Visual-field defect: portion of visual field with no vision or with abnormal vision, typically resulting from damage to visual nervous system Lose primary visual cortex in right hemisphere, person will be blind on opposite (left) side of visual space If lesion in right parietal lobe, problems directing attention to objects and places on their left Neglect Patients behave as if part of world were not there
More Less
Unlock Document


Only half of the first page are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


OR

Don't have an account?

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit