Someone recently bought our

students are currently browsing our notes.

X

1 Important Concepts In Retinal Processing Notes

Psychology Notes > Perception (2nd year) Notes

This is an extract of our 1 Important Concepts In Retinal Processing document, which we sell as part of our Perception (2nd year) Notes collection written by the top tier of Durham University students.

The following is a more accessble plain text extract of the PDF sample above, taken from our Perception (2nd year) Notes. Due to the challenges of extracting text from PDFs, it will have odd formatting:

Important concepts in retinal processing
Important concepts in retinal processing
 Convergence
 Lateral Inhibition
 Receptive fields
 Fovea vs periphery
 Photopic vs scotopic vision
Sensation = registration of physical stimuli from the environment by the sensory organs
Perception = the interpretation of sensations by the brain
Eye, photoreceptors = converts the stimulus into electrical signals
Retina, visual cortex = interprets the stimulus
Light enters the pupil  through retina  photoreceptors at back of retina

1. Cones = active during daylight
Found mainly in the fovea 3 types  colour vision: SML cones

2. Rods = active during low light
Found in the periphery 1 type  colour blind

Absolute number
Distribution
Dark adaptation
Absolute sensitivity
= ability to detect light in darkadapted eye
Acuity = detail vision
Neural convergence
= no. neurons synapse onto a single neuron
Spectral sensitivity
Colour vision 2 types of vision

Rod or cone dominated?
Sensitivity
Visual acuity
Maximum sensitivity
Colour sensation?

Rods 120 million / eye
Retinal periphery
Initially slow, but continue to full adaptation
High

Cones 6 million / eye
Fovea and periphery
Initially rapid, then plateau
Low

Low
More

High
Less

Short λ
No
Scotopic vision

Long λ
Yes (S, M, L cones)
Photopic vision

Scotopic vision
Rod
Sensitive in dim light
Poor 510nm
No

Photopic vision
Cone
Insensitive in dim light
Good 555nm
Yes

Photoreceptors convert light E  electrical signals which pass onto the ganglion cells via bipolar cells

Buy the full version of these notes or essay plans and more in our Perception (2nd year) Notes.