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Slides on Vision
Blue / YellowBipolar Cell
Green / RedBipolar Cell+− +−
+− − + −/+Opponent – Process
Theory
Blue Green Red Yellow
+-
On center
off surround
Center-Surround Cells
+- -
G
+-
Mild excitation
Mild inhibition
Maximal excitation
Maximal inhibition
Minimal effect
+-
+-
+-
+-
Darker
Lighter
Mach Bands &The Hermann Grid
+-A
+-B
+-C
+-D
B is more inhibited than A and will appear darker
C is less inhibited
than D and will appear lighter
Explaining Mach Bands
Small foveal
receptive fields
Largeperipheralreceptive
fields
More light falls on inhibitory surroundwhich leads to seeing a dark spot
+---
-+ --
Explaining The Hermann Grid