Visual Processing: Retina and V1
7 important questions on Visual Processing: Retina and V1
What is the difference between rods and cones?
-Rods are mostly found in the peripheral area
- Rods 1000x sensitive to light --> good at detecting light
- Cones --> color vision, sharpness
- 3 different kinds of cones: long wavelength (red or yellow), medium wavelength (best to green, less to yellow), short wavelength (blue)
Why is it weird that we seem to see color everywhere?
What is retinal color blindness?
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Why is there a need for data compression and how does the brain solve this?
The brain solves this by:
- Ganglion cells only respond to contrast (ON and OFF center surround RG cells), not to diffuse light (which is why we cannot see 'real' luminance differences, only inferred ones)
- Color coding via RG&BY cells
- Sensitivity to CHANGE
- Parallel pathways (Midget & Parasol cells)
What are the characteristics of midget & parasol cells?
- Small receptive field, high spatial frequency (detail)
- Single cone center and surround: color contrast selective
- Slow sustained responses
Parasol cells:
- Large receptive field, low spatial frequency
- Many cones inout to center and surround: not color selective
- Fast transient response
What is an anatomical/functional difference in V1?
- Blobs & Interstipes
What factors influence the weighted computational power of a neuron?
- Inputs from stronger synapses (more receptors) have more weight
The question on the page originate from the summary of the following study material:
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