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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.

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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
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?
Visual acuity
Maximum sensitivity
Colour sensation?

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

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



Short λ
Scotopic vision

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

Scotopic vision
Sensitive in dim light
Poor 510nm

Photopic vision
Insensitive in dim light
Good 555nm

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

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