Illustrations from: Basic Vision: An Introduction to Visual Perception, by Robert Snowden, Peter Thompson & Tom Troscianko, Oxford University Press (2006)
The Physical World
Our senses can only give us a rough idea of specific aspects of the visual world
Short-sighted
Dyslexia
A dyslexic man comes to a Toga party dressed as a goat
Lazy Cartoonist
The human brain can turn two dots with a line below them into a human face with expressions
Missing the Big Things
The Grandmother Cell
A hypothetical neuron that is associated directly with a complex and specific concept or object
One-Ton Brain
Selective pressures can only drive our brains to a certain size before other factors in the balance outweigh the advantages
Size After Effect
Retinal vs Real Size
'Those people look like ants from up here': An ant close up can be the same size on your retina as a person far away
Percy Pond Creature
The selective advantages of the evolution of new photoreceptors in tetrapods - the ability to distinguish objects by reflected spectrum in addition to illumination
Raging Bull in Blue-Yellow
Bulls are colour-blind and can only see in blue-yellow channels, so can't distinguish the matador's red cloth (muleta) from other red or green objects
Helmholtz vs Sherrington
