100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
visual perception £5.99
Add to cart

Lecture notes

visual perception

 25 views  0 purchase

In depth lecture notes about visual perception/brain and cognition, may also contain diagrams and references- easy to understand layout great revision/exam prep

Preview 1 out of 4  pages

  • October 8, 2019
  • 4
  • 2018/2019
  • Lecture notes
  • Unknown
  • All classes
All documents for this subject (11)
avatar-seller
lozjones00
WEEK 2 BRAIN AND COGNITION- visual perception



Is the physical world the same thing as our visual experience- no BERKELEY + EINSTEIN

‘your physical skull is beyond the experienced dome of the sky’- VELMANS 2009

VISUAL ILLUSIONS- show the rules that the brain uses to construct visual experience eg KANISZA
TRIANGLE – the visual brain is constructing things that aren’t three [see Bertamini’s psych 309]

The brain only sees in 2D and so it interprets the retinal image and creates a representation= the
interpretation – its always looking for a 3D representation

Sensations inform perception- our visual and sensory experiences can be described as ‘percepts’ –
sensations are more basic elements which are elaborated into precepts by visual parts of the brain.

Top down and Bottom up contributions*



General properties of sensory systems

Vision is just one sensory modality (e.g. sound, taste) … the visual system responds to light, auditory
systems responds to vibrations, olfactory systems responds to chemicals in nose and gustatory
systems to chemicals in the mouth, tactile receptors respond to mechanical deformation of skin. WE
DON’T JUST HAVE 5 SYSTEMS- we have nociception responding to skin damage and vestibular
system responding to gravity and acceleration of the head.

EXTEROCEPTION AND INTEROCEPTION.
Exteroception provides brain with signals about energies in the outside world, interoception
provides the brain with signals of what’s going on inside the bodyProprioception is the main example
of interoception – it provides signals about the contraction of muscles and the angles of our joints
(allows you to know your current posture in a totally dark room). The brain is also bombarded with
interoceptive signals about heart rate, breathing, gut dilation, blood sugar concentrations and so
on… Emotional states are intimately linked to interoception (James, 1890).
Sensory systems are ‘bounded’- very limited window on the physical world with narrow boundaries.
WHY… TRANSDUCTION- The conversion of physical energy into action potentials


The psychophysics approach- a part of psychology that plots lawful relationships between physical
world and subjective experience.
What is the minimum strength of stimulus we can detect? [through the narrow window] eg what is
too quiet to hear and what can we just about hear. We like to determine JNDs (just noticeable
differences) eg applied pressure = pedestal stimulus and slightly harder pressure= test stimulus
JND increases with stimulus intensity- WEBERS LAW--- ‘Imagine you are poor and have one
pound, and you get another pound. That would change your life quite a lot. Imagine you are rich and
have million pounds, and you get another pound. That would hardly change your life at all.’
Scaling- Steven’s power law is a more refined version of Weber Fechner type scaling. The
relationship between physical stimulus and sensation often non-linear.

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

Quick and easy check-out

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

Focus on what matters

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 lozjones00. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £5.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

52510 documents were sold in the last 30 days

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

Start selling
£5.99
  • (0)
Add to cart
Added