Summary

Summary chapter 9 psyc 2240 (9-2)

5 views 0 purchase

Course
Psyc 2240

Institution
York University (Ebor )

this notes covers all the important material across chapter 9-2 of the biological basis of behaviour /psyc2240. all important points, definitions and explanations. enjoy saving your time!

[Show more]

Preview 2 out of 10 pages

View example

Uploaded on December 3, 2022
Number of pages 10
Written in 2022/2023
Type Summary

psyc2240
chapter9
chapter 9
psyc2240 chapter 9
biological basis of behaviour

CA$49.64

Added

Add to cart Add to wishlist

100% satisfaction guarantee
Immediately available after payment
Both online and in PDF
No strings attached

Chapter 9-2

Visual system’s functional anatomy

 our primary sensory experience is visual
 far more of the human brain is dedicated to vision rather than other senses

Structure of retina

 light energy travels from outside world through the pupil into the eyes then reaches a
light-sensitive surface which is called retina

 structure of retina is composed of photoreceptors beneath the retinal neurons
 even though the retinal neurons are in front of the photo receptor, but they do not
prevent the light from being absorbed because: 1. Retinal neurons are transparent 2.
photoreceptors are highly sensitive to light

 photoreceptors + retinal neuronsperform amazing functions=> discriminate
wavelengths so we can distinguish colors and work in deafferent light intensities (bright
to dim)

 brain can perform adjustments regardless of the orientation of the images it receives

 example: you can wear glasses which invert visual images for several days, the world
would appear upside down at first but then suddenly everything appears right side up
again. Because the brain corrects the distortion.

Fovea

 your vision is better in the central of your visual field than at the margins or periphery

 photoreceptors are more densely packed at the center of your retina this region is
known as fovea

, Blind spot

 small area of retina which is also known as optic disc

 blood vessels enter and exit at the eye

 also, fibres leading out of retinal neurons forms optic nerve, which goes to the brain at
this area

 visual system solved the blind spot problem, how? optic disc is in a different location in
each eye

 also, it is lateral to fovea: in right eye it is at the right side of the fovea and in the left eye
it is at the left side of the fovea

 for people are blind in one eye the sightless eye cannot compensate for the blind spot in
the functioning eye, BUT the visual system compensates for the blind spot in many
other ways.

 blind spot is important to neurologists

 they indirectly view the condition of optic nerve while providing window on events
happening in the brain

 in intercranial pressure increases (due to tumors or brain abscess=infection) the optic
nerve can swells, the reason is because optic nerve (just like other nerves) is surrounded
by CSF. Pressure inside the cranium can displace CSF and cause swelling in optic nerve

 another cause of papilledema is inflammation of the optic nerve itself.

 In most cases a swollen optic nerve will lead to losing sight in the person

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller avarouzitalab. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for CA$49.64. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

79976 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling