Summary
Summary From Perception to Consciousness
- Course
- Institution
Principles of Neural Science, Kandel ISB: 9780071390118 Neuroscience, Purves ISB:9781605358413
[Show more]
Seller
Follow
drewesnoor
Content preview
PURVES NEUROSCIENCE CHAPTER 11: VISION: THE EYEIn the retina photoreceptors do not exhibit action potentials; light activation causes a graded change in
membrane potential and a corresponding change in the rate of transmitter release onto postsynaptic
neurons.
Shining a light onto a photoreceptor leads to a membrane hyperpolarization.
Each transducin molecule activates only one PDE molecule, each PDE is capable of catalyzing the
breakdown of 6 cGMP molecules.
Photoreceptors are most sensitive to light at lower levels of illumination. As illumination increases,
sensitivity decreases.
Scotopic vision = rod-mediated vision, at the lowest levels of illumination when only the rods are
activated.
Mesopic vision = both rods and cones are activated.
Photopic vision = only cones are activated.
Rod system is more convergent, making it a better detector of light. This convergency at the same time
reduces the spatial resolution of the rod system.
Foveola = central 300 micrometer of the fovea, totally rod-free.
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 drewesnoor. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $4.31. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
56326 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now