Class Notes (838,386)
Canada (510,872)
Psychology (4,237)
PSY313H5 (18)
Lecture 3

PSY213 Lecture 3.docx

5 Pages
104 Views
Unlock Document

Department
Psychology
Course
PSY313H5
Professor
Giampaolo Moraglia
Semester
Summer

Description
PSY213 Lecture 3 - Jan 24, 2013 Sensory Aging  exp. some loss of sensitivity as we age  all senses attuned to some source of energy from the environment that is picked up from specialized recepter cells located in sensory organs (ears, eyes, nose, etc.)  sensory loss may be caused by deterioration in the nerves/fibres, organs, brain Age related Changes occur at all levels of a sensory system  sensory system deterioration may be from disease, misuse/disuse of sensory organs  field study: students made to wear special lenses (vision loss), blockers i ears, students sent to do everyday things (ex. groceries)  o students became very cautious, fumbling around, etc.  schlerotic coat = sturdy to withstand pressure from within eye (2X atmospheric pressure) and so the eye can keep its spherical shape  white of eyes are white because the eye is reflecting most of the light that enters it  pupil responds to emotional, sexual arousal, also light, etc.  retina - captures light energy that leads to nerve signals  two chambers: aqueous: filled with water; vitreus chamber: contains jelly like substance  muscles connected to lens allow for changing the curvature of lens to accomodate for different vision  lens flat for visually seeing long distances (6-7 and more metres away); image blurred when lens is flat and looking at closer objects  muscles change refractory power of eye by increasing curvature of lens therefore making it able to focus on closer objects; increasing curvature as objects get closer  near point: smallest point at which you can see an object clearly; lens has reached its maximum curvature  with age vitreus humour (transparent jelly in vitreus chamber) becomes more opaque (loses transparency), makes image harder to reach retina at back of eye  eye becomes more vulnerable to debris from metabolic processes of eyes, casts shadow over retina makes you see small shadows (usually doesn't bother ppl too much b/c gravity brings debris down to settle at bottom of the eye)  seeing shower of sparkles means retina is at risk of being detached  iris gets smaller; limits amount of light able to get through pupil (b/c pupil gets smaller)  o limits amount of light able to get in by almost 60-70% o called: senile meiosis (happens by age 60)  PUPIL RESPONDS MORE SLOWLY WITH AGE  o changes due to weakening of muscles that control the pupil o eye takes longer to adjust to changes in illumination (ex. driving at night, leaving a theatre, etc.)  lens gains layers like an onion from birth to get bigger  o older cells in inner core of lens shrivel and harden b/c lose water, lens become less transparent o around age 35, lens begins to get yellow; harder to discriminate colour o lens gets bigger, thicker, harder, and loses its ability to change its shape (harder to focus properly at short distances)  Presbyopia  o increase in near point distance (notice you have to move objects farther away just to see them); begins around age 40 (average), women experience this 3-5 years earlier than men o condition easily corrected with corrective lenses o people who already have vision problems (myopia) may need to get bifocals in their 40s  all physiological factors for vision loss added up do not account for visual acuity which means that neural parts of the visual system also plays a role  by age 80, visual acuity is at 20% of what is was at age 30  dynamic visual acuity ability to see objects that are moving (ex. reading ad on bus as its moving)  o mediated by different types of special cells o visual field shrinks as we get older (horizontal field vision decreases from 170 degrees to 140 degrees) o depth perception also declines (b/w 40 -50 yrs); b/c of loss of binocular cells VISUAL DISORDERS  develop slowly and painlessly; can become far advanced before effects are noticed (why its important to have regular eye checkups)  Glaucoma  o in healthy eye, there is a balance b/w rate at which new humour is created and old drained away o improper drainage/ too much being created builds up in eye and increases the pressure thus constraining blood vessels that provide oxyge
More Less

Related notes for PSY313H5

Log In


OR

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