Psychology 1000 Chapter Notes - Chapter 5: Swiss Cheese, Retina, Ganglion
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Chapter 5 – Visual Processing Oct 28
Single Cell Recording
Next time: Perception; Scan 195-200
How do rods and cones work?
How does the visual system enhance images?
How can we explain phantom spots?
Let’s say you can barely distinguish 100 grams (test) of swiss cheese, to notice a difference in
weight, it would have to be 285 or 315.
I = 5
300 = 100
Know: Ganglion, Bipolar, Cone, Road, Horizontal, Amacrine parts
Roads & cones
120 million Rods
7 million Cones
Operate at low intensity
o Sensitive for brightness
None in center of your Fovea
o Densely packed at the side of your retina
o Only give us black & whit
Good at night vision
o When you’re looking at a star directly, its focused at the fovea, so it’s better to
look through peripheral
Operate at higher intensities
o “Insensitive” for brightness
Concentrated in Fovea
o You need cones to get colour
But how do Rods & Cones work?
In the presence of light, the chemicals in them break down
Contain a chemical sensitive to light, and in the presence of light, they break down