Psychology Lecture 1
The Retina, Single Cell Recording, Lateral Inhibition
How do rods and cones work?
How does the visual system enhance images?
How can we explain phantom spots?
Ganglion cells first stage on outer range of retina
Connected to bipolar neuron
Connected to receptor
This is where info is decoded and sent to the optic nerve
Horizontal cells also used, inhibitory from receptor to ganglion
Clean up image on the way to ganglion
Rods and Cones
o Duplex Theory
2 kinds of ways to decode a visual signal, with rods and cones
o 120 million rods
o 7 million cones
Operate at low intensity
Sensitive for brightness
None in Fovea
No color and are very sensitive
Pick up low sources of light
Operate at higher intensities
Insensitive for brightness
o At low levels of light, they won’t work
Concentrated in Fovea
o How do rods and cones work?